Fire Protection

B737NG/26/301 Fire Protection

Boeing 737-600/700/800/900

Fire Protection Training manual

For training purposes only LEVEL 3

ATA 26

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This publication was created by Sabena technics training department, Brussels-Belgium, following ATA 104 specifications. The information in this publication is furnished for informational and training use only, and is subject to change without notice. Sabena technics training assumes no responsibility for any errors or inaccuracies that may appear in this publication. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of Sabena technics training.

Contact address for course registrations course schedule information Sabena technics training [email protected]

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Table of Contents 1. INTRODUCTION. ........................................................................... 6 2. ENGINE FIRE DETECTION.............................................................. 8 2.1. General Description..............................................................................10 2.2. Engine Fire Detector Elements...............................................................12 2.3. Engine and Apu Fire Detection Control Module....................................14 2.4. Engine & Apu Fire Detection Control Module........................................16 2.5. Engine Fire Detection............................................................................20 3. APU FIRE DETECTION.................................................................. 22 3.1. General Description..............................................................................24 3.2. APU Fire Detector..................................................................................26 3.3. Engine & APU Fire Detection Control Module........................................28 3.4. APU Fire Detection................................................................................30 4. FIRE EXTINGUISHING.................................................................. 32 4.1. Introduction..........................................................................................34 4.2. Engine Fire Extinguishing - Operation....................................................36 4.3. Extinguisher Bottle................................................................................38 4.4. Extinguisher Bottle Squib......................................................................40 4.5. Overheat/Fire Protection Panel..............................................................42 4.6. Engine Fire Extinguishing......................................................................44 4.7. Engine and APU Fire Extinguisher Test...................................................46 4.8. APU Fire Extinguishing..........................................................................50 4.9. APU Fire Extinguisher Bottle..................................................................54 4.10. APU Fire Extinguisher Bottle Squib......................................................56 4.11. APU Ground Control Panel.................................................................58 4.12. APU Fire Extinguishing Operation........................................................60 5. LOWER CARGO COMPARTMENT SMOKE DETECTION................ 62 5.1. Lower Cargo Compartment Component Location.................................62 5.2. General Description..............................................................................66 5.3. Smoke Detector....................................................................................68 EFFECTIVITY ALL

5.4. Cargo Electronic Unit............................................................................70 5.5. Bottle Discharge Circuit.........................................................................72 5.6. Training Information Point.....................................................................74 6. LOWER CARGO COMPT FIRE EXTINGUISHING............................ 76 6.1. Component Locations...........................................................................78 6.2. Fire Extinguishing Bottle........................................................................80 6.3. Flight Compartment /Component.........................................................82 6.4. Bottle Discharge Circuit Operation........................................................84 6.5. Bottle Discharge Test Circuit..................................................................86 7. LAVATORY SMOKE DETECTION.................................................. 88 7.1. General Description..............................................................................90 7.2. Interface...............................................................................................92 8. WHEEL WELL OVERHEAT DETECTION......................................... 94 8.1. General Description..............................................................................96 8.2. Overheat Detector Element...................................................................98 8.3. Compartment Overheat Detection Ctl. Module...................................100 8.4. Wheel Well Overheat Detection Operation..........................................104 9. WING AND BODY OVERHEAT DETECTION................................ 106 9.1. General Description............................................................................108 9.2. Compartment Overheat Detection Ctl. Module...................................110 9.3. Control Module Operation..................................................................112 9.4. Wing And Body Overheat Detection Operation...................................114 10. LAVATORY FIRE EXTINGUISHING............................................ 116 11. PORTABLE FIRE EXTINGUISHING............................................ 118

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List of Illustrations APU FIRE DETECTION.................................................................................................................................................................................23 APU FIRE DETECTION.................................................................................................................................................................................25 APU FIRE DETECTION.................................................................................................................................................................................31 APU FIRE DETECTOR..................................................................................................................................................................................27 APU FIRE EXTINGUISHER............................................................................................................................................................................51 APU FIRE EXTINGUISHER BOOTLE SQUIB....................................................................................................................................................57 APU FIRE EXTINGUISHER BOTTLE...............................................................................................................................................................55 APU FIRE EXTINGUISHING..........................................................................................................................................................................53 APU FIRE EXTINGUISHING - OPERATION.....................................................................................................................................................61 APU GROUND CONTROL PANEL................................................................................................................................................................59 BOTTLE DISCHARGE CIRCUIT.....................................................................................................................................................................73 BOTTLE DISCHARGE CIRCUIT OPERATION..................................................................................................................................................85 BOTTLE DISCHARGE TEST CIRCUIT............................................................................................................................................................87 CARGO ELECTRONIC UNIT........................................................................................................................................................................71 COMPARTMENT OVERHEAT DETECTION..................................................................................................................................................111 CONTROL MODULE.................................................................................................................................................................................101 CONTROL MODULE.................................................................................................................................................................................111 CONTROL MODULE OPERATION..............................................................................................................................................................103 CONTROL MODULE OPERATION..............................................................................................................................................................113 ENGINE AND APU EXTINGUISHER TEST......................................................................................................................................................49 ENGINE AND APU FIRE DETECTION CONTROL MODULE.............................................................................................................................15 ENGINE & APU FIRE DETECTION CONTROL MODULE.................................................................................................................................17 ENGINE & APU FIRE DETECTION CONTROL MODULE.................................................................................................................................29 ENGINE FIRE AND APU FIRE EXTINGUISHER TEST........................................................................................................................................47 ENGINE FIRE DETECTION..............................................................................................................................................................................9 ENGINE FIRE DETECTION............................................................................................................................................................................11 ENGINE FIRE DETECTION............................................................................................................................................................................21 ENGINE FIRE DETECTOR ELEMENTS............................................................................................................................................................13 ENGINE FIRE EXTINGUISHING.....................................................................................................................................................................35 ENGINE FIRE EXTINGUISHING.....................................................................................................................................................................45 ENGINE FIRE EXTINGUISHING - OPERATION................................................................................................................................................37 EXTINGUISHER BOTTLE..............................................................................................................................................................................39 EXTINGUISHER BOTTLE SQUIB....................................................................................................................................................................41 FIRE EXTINGUISHING..................................................................................................................................................................................33 FIRE EXTINGUISHING BOTTLE.....................................................................................................................................................................81 FIRE PROTECTION - INTRODUCTION.............................................................................................................................................................7 FLIGHT COMPARTMENT COMPONENT.......................................................................................................................................................83 - FLIGHT COMPT........................................................................................................................................................................................65 LAVATORY FIRE EXTINGUISHING..............................................................................................................................................................117 LAVATORY SMOKE DETECTION..................................................................................................................................................................89 LAVATORY SMOKE DETECTION ................................................................................................................................................................91 LAVATORY SMOKE DETECTION INTERFACE................................................................................................................................................93 LOWER CARGO COMPARTMENT SMOKE DETECTION................................................................................................................................63 LOWER CARGO COMPARTMENT SMOKE DETECTION................................................................................................................................65 LOWER CARGO COMPARTMENT SMOKE DETECTION................................................................................................................................67 LOWER CARGO COMPT FIRE EXTINGUISHING...........................................................................................................................................77 LOWER CARGO COMPT FIRE EXTINGUISHING...........................................................................................................................................79 OVERHEAT DETECTOR ELEMENT................................................................................................................................................................99 OVERHEAT/FIRE PROTECTION PANEL..........................................................................................................................................................43 PORTABLE FIRE EXTINGUISHING...............................................................................................................................................................119 SMOKE DETECTOR....................................................................................................................................................................................69 TRAINING INFORMATION POINT.................................................................................................................................................................75 WHEEL OVERHEAT DETECTION..................................................................................................................................................................97 WHEEL WELL OVERHEAT DETECTION.........................................................................................................................................................95 WHEEL WELL OVERHEAT DETECTION OPERATION....................................................................................................................................105 WING AND BODY OVERHEAT DETECTION...............................................................................................................................................107 WING AND BODY OVERHEAT DETECTION OPERATION............................................................................................................................115 WING & BODY OVERHEAT DETECTION....................................................................................................................................................109

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Abbreviations and Acronyms adv APU BITE CEU det DISP E/E ENG ext hyd inop LED LOC Lts maint MD&T mem MLG ovht PA ref rev typ vlv W/W warn

Advisory Auxiliary Power Unit Built In Test Equipment Cargo Electronics Unit Detector Display Electronic Equipment Engine Extinguish Hydraulic Inoperable Light Emitting Diodes Local Lights Maintenance Master Dim and Test Memory Main Landing Gear Overheat Passenger Address Amplifier Reference Reverser Typical Valve Wheel Well Warning

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1. INTRODUCTION. The fire protection systems monitor the airplane for these conditions : - Fire, - Smoke, - Overheat, - Pneumatic duct leaks. Fire/Overheat Detection. The airplane has these fire/overheat detection systems. - Lavatory smoke detection, - Engine fire detection, - APU fire detection, - Wheel well fire detection, - Wing/Body overheat detection. Extinguishing. The airplane has these fire extinguishing systems : - Lavatory fire extinguishing bottles, - Engine fire extinguishing bottles, - APU fire extinguishing bottle, - Portable fire extinguishers.

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FIRE PROTECTION - INTRODUCTION EFFECTIVITY ALL

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2. ENGINE FIRE DETECTION. The engine fire detection system monitors the engines for overheat and fire conditions. If the system senses one of these conditions, it will show on lights in the flight compartment. These lights are on the P7 light shield and the overheat/fire protection panel. A bell also operates in the flight compartment for engine fire warning.

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2.1. General Description. These are the major components of the engine fire detection system : - Engine overheat/fire detectors, - Engine and APU fire detection control module (M279), - Overheat/fire protection panel, - Glareshield, P7 panel, - Aural warning unit. The engine fire detection system uses dual overheat/fire detector loops. The loops are identified as loop A and loop B. The detector loops on the engine supply overheat and fire signals to the engine and APU fire detection control module. This module uses the signals to set the related alarm indications in the flight compartment.

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ENGINE FIRE DETECTION

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2.2. Engine Fire Detector Elements. The engine fire detector elements sense high temperatures in the engine area. Physical Description. There are four fire detection loop assemblies on each engine. Each assembly has two detector elements, two gas charged sense tubes and a support tube. One is loop A and the other is loop B. Each loop has four detectors. There are eight detector elements on each engine. The detector elements have these components : - Overheat pressure switch, - Fire pressure switch, - Fault pressure switch, - Resistors, - Terminal stud, - A stainless steel, gas charged tube. Location. These are the locations of the engine detector elements :

Operation. The three pressure switches sense for these conditions : - Overheat, - Fire, - Fault (Loss of gas pressure). Gas pressure in the sense tube holds the FAULT pressure switch in the normally closed position. The other two pressure switches close when the gas pressure increases because of an overheat or fire condition. The overheat and fire signals go to the engine and APU fire detection control module. This module supplies overheat or fire indication in the flight compartment. If the pressure in the sense tube decreases, the FAULT switch opens. This causes a large change in resistance which sends the fault signal to the engine and APU fire detection control module. This module sets the fault condition and the related FAULT AREA light comes on.

- Two on the upper fan case section, - Two on the lower fan case section, - Two on the left core section, - Two on the right core section.

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ENGINE FIRE DETECTOR ELEMENTS EFFECTIVITY ALL

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2.3. Engine and Apu Fire Detection Control Module. The engine and APU fire detection control module monitors detector elements for overheat and fire conditions in the engine and APU areas. Physical Description. There are five amber FAULT AREA lights on the front of the unit. Engine 1 has a light for each detector loop. Engine 2 also has a light for each detector loop. The APU has one Light for it’s detector loop. Three red FAULT DISPLAY lights are below the FAULT AREA lights. These are light emitting diodes (LEDs). The FAULT/INOP TEST switch is below the FAULT DISPLAY placard. Location. The engine and APU fire detection control module is in the electronic equipment compartment rack E2-2. Operation. Under normal conditions, all front panel lights are off. When a fault condition occurs, the related FAULT AREA comes on. The FAULT DISPLAY lights show a fault code.

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ENGINE AND APU FIRE DETECTION CONTROL MODULE EFFECTIVITY ALL

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2.4. Engine & Apu Fire Detection Control Module. Loop Select. The overheat detector (OVHT DET) switch on the overheat/fire protection panel lets the crew select the mode of operation. Each switch has these positions : - NORMAL, loop select logic makes loop A and loop B agree before the alarm condition operates (AND logic). - A, Loop select logic makes loop A the only sense authority (OR logic). - B, loop select logic makes loop B the only sense authority (OR logic). Overheat Condition. At the overheat temperature set point, the gas expands in the detector component and closes the OVERHEAT pressure switch. This decreases the resistance of the detector component. The engine and APU fire detection control module uses this decrease in resistance to set the overheat condition. These are the results of an overheat condition : - Related P8 engine fire handle unlocks, - P8 ENG OVHT light comes on, - P7 MASTER CAUTION lights come on, - P7 OVHT/DET annunciator comes on. Fire Condition. At the fire temperature set point, the gas expands more to close the FIRE pressure switch in the detector. This reduces the resistance further. The engine and APU fire detection control module uses this signal to set the fire condition. These are the results of a fire condition : - Related P8 engine fire handle comes on, - P7 FIRE WARN lights come on, - Aural warning unit gives the bell sound, - The overheat indications stay on.

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Fault Condition. Fault conditions automatically show on the front panel of the engine and APU fire detection control unit. The FAULT AREA lights show what loop causes the failure. The FAULT DISPLAY lights show what section of that loop failed. The OVHT/FIRE test informs the flight crew of fault conditions detected by the engine and APU fire detection control module. If the OVHT DET switch is in the NORMAL position, the two loops on one engine must have a fault condition before the P8 FAULT light comes on. System Test. The two tests you can do on the engine fire protection system are OVHT/FIRE and FAULT/INOP. The OVHT/FIRE test does a check of the engine and APU fire detection control module operations and flight compartment indications. The FAULT/INOP does a check of the engine and APU fire detection control module’s fault detection circuits and related flight compartment indications. You can do each test from the flight compartment. You can also do the FAULT/ INOP TEST at the engine and APU fire detection control module. The FAULT/INOP test simulates a dual loop fault condition in the engine and APU fire detection control module. These are the indications of a good FAULT/ INOP TEST : - All fault area lights on the engine and APU fire detection control module come on, - The engine and APU fire detection control module fault display lights come on after 5 seconds, - The P7 master caution and OVHT/DET annunicator lights come on, - P8 fault light comes on, - P8 APU DET INOP light comes on.

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ENGINE & APU FIRE DETECTION CONTROL MODULE EFFECTIVITY ALL

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If there is a fault condition when you start the FAULT/INOP TEST, the fault display lights on the engine and APU fire detection control module shows you a fault code. The OVHT/FIRE test simulates a ovht/fire condition. These are the indications of a good OVHT/FIRE test: - P7 FIRE WARN lights on the glareshield come on, - P8 ENG 1, ENG 2 and APU fire handles come on, - P8 wheel well light comes on (115v ac power is necessary), - Aural warning unit supplies a bell sound, - APU ground control panel operates the horn and light, - P8 ENG 1 and ENG 2 overheat lights come on, - P7 master caution lights come on, - P7 OVHT/DET annunciator light comes on. - ENG 1, ENG 2 and APU fire handle switches unlock.

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2.5. Engine Fire Detection. The detector elements on the engine supply fire and overheat detection signals. If there is a fire or overheat condition, the signal goes from the detector elements to the engine and APU fire detection control module. This module sends the overheat or fire alarm signal to the flight compartment. Overheat Indication. These are the flight compartment indications for an engine overheat : - The P8-1 engine overheat light comes on, - Master caution lights come on, - OVHT/DET annunciator light comes on, - The overheat alarm releases the P8 panel fire handle lock. Fire Indication. The fire detection temperature level is more than the overheat level. When the engine and APU fire detection control module detects an engine fire condition, the overheat signal and its flight compartment indications stay active. For an engine fire, you get all overheat condition indications. You also get these indications : - The P8-1 fire light comes on, - P7 fire warn light comes on, - Aural warning unit gives a bell sound. To stop the bell sound, push the P8 panel BELL CUTOUT switch. You can also push one of two FIRE WARN switches on the P7 panel.


System Test. The two tests you can do on the engine fire protection system are OVHT/FIRE and FAULT/INOP. The OVHT/FIRE test does a check of the engine and APU fire detection control module operations. These are the flight compartment indications of a OVHT/FIRE test that passed : - P7 fire warn lights on the glareshield come on - P8 ENG 1, ENG 2 and APU fire handles come on - P8 wheel well light comes on (115v ac power is necessary) - Aural warning unit supplies a bell sound - APU ground control panel operates the horn and light - P8 ENG 1 and ENG 2 overheat lights come on - P7 master caution lights come on - P7 OVHT/DET annunciator light comes on. The FAULT/INOP does a check of the engine and APU fire detection control module fault detection circuits. These are the indications of a FAULT/INOP test that passed : - All fault area lights on the engine and APU fire detection control module come on, - The engine and APU fire detection control module fault display lights come on after 5 seconds, - The P7 master caution and OVHT/DET annunicator Lights come on - P8 fault light comes on, - P8 APU DET INOP light comes on. Single Loop Operation. If an engine detector element fails to operate, the engine and APU fire detection and control module changes to single loop operation. In single loop mode, only one loop must detect an overheat or fire condition for the engine and APU fire detection control module to give the alarm condition. There is no indication in the flight compartment of single loop operation until you do the OVHT/FIRE test.

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ENGINE FIRE DETECTION EFFECTIVITY ALL

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3. APU FIRE DETECTION. The APU fire detection system monitors the APU for fire conditions. When the system senses a fire, alarm indications operate in the flight compartment and the main landing gear wheel well. The indications are on the glareshield P7 panel and on the engine and APU firecontrol panel on the P8. A bell also operates in the flight compartment. A horn and a red light operate in the right main wheel well.

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APU FIRE DETECTION EFFECTIVITY ALL

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3.1. General Description. These are the major components of the APU fire detection system : - APU fire detectors, - Engine and APU fire detection control module, - APU ground control panel, - Overheat/fire protection panel. The APU detection system monitors for fire conditions, only. If the system senses a fire condition, the signal goes to the engine and APU fire detection control module. This module sends the fire alarm to the flight compartment and, APU ground control panel in the main wheel well. This module also supplies a signal to stop the APU.

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3.2. APU Fire Detector. The APU fire detectors monitor for high temperatures in the APU compartment. Physical Description. The detector loop has three sense elements. Each element has these pressure components : - Fire pressure switch, - Fault pressure switch, - Resistors, - Terminal stud, - Stainless steel gas filled tube. Location. These are the locations of the three APU sense elements : - Upper APU compartment, - Lower APU compartment, - Tailpipe. Operation. There two pressure switches for each element. One switch senses for fire. The other switch senses for a FAULT (loss of gas pressure) condition. Gas pressure in the tube holds the pressure switch in the close position. The FIRE pressure switch closes when the gas pressure increase because of a fire condition. The fire signal goes to the engine and APU fire detection control module which provides the fire indications in the flight compartment. Loss of pressure in the tube causes the FAULT switch to open. This causes a large change in resistance. This supplies a fault signal to the engine and APU fire detection control module.

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APU FIRE DETECTOR EFFECTIVITY ALL

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3.3. Engine & APU Fire Detection Control Module. Fire Condition. At the fire temperature set point, the gas expands to close the FIRE pressure switch in the detector element. This decreases the resistance of the detector element. The control module uses this change in resistance to set the fire condition. These are the results of a fire condition : - APU fire handle lights come on, - APU fire handle unlocks, - P7 FIRE WARN lights come on, - Aural Warning Unit gives the bell sound, - APU automatic shutdown, - APU remote horn and Light operate. System Test. The two tests you can do on the APU fire protection system are OVHT/FIRE and FAULT/INOP. The OVHT/FIRE test does a check of the engine and APU fire detection control module operations and flight compartment indications. The FAULT/INOP does a check of the engine and APU fire detection control module’s fault detection circuits. It also does a test of the related flight compartment indications.


The FAULT/INOP test simulates a dual loop fault condition in the engine and APU fire detection control module. These are the indications of a good FAULT/ INOP test : - All fault area lights on the engine and APU fire detection control module come on, - The engine and APU fire detection control module fault display lights come on after 5 seconds, - The P7 master caution and OVHT/DET annunicator lights come on - P8 fault light comes on, - P8 APU DET INOP light comes on. The OVHT/FIRE test simulates a fire condition. These are the indications of a good OVHT/FIRE test : - P7 FIRE WARN lights on the glareshield come on, - P8 ENG 1, ENG 2 and APU fire handles come on, - P8 wheel well light comes on (115v ac power is necessary), - Aural warning unit supplies the bell sound, - APU ground control panel operates the horn and light. If there is a fault condition when you start the FAULT/INOP TEST, the FAULT DISPLAY gives you a fault code.

You can do each test from the flight compartment. You can also do the FAULT/ INOP TEST at the engine and APU fire detection control module.

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ENGINE & APU FIRE DETECTION CONTROL MODULE EFFECTIVITY ALL

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3.4. APU Fire Detection. The APU detection components monitor only for fire conditions. If they sense a fire condition, the signal goes to the engine and APU fire detection control module. This module gives the fire and APU auto shutdown signals. These are the flight compartment indications of an APU fire condition : - Fire handle light on P8, - Fire warn light on P7, - Aural warning unit gives a bell sound. The APU ground control panel supplies the external indications of an APU fire. A horn and a red light operate on the APU ground control panel. The horn sound and the red light operate alternately at a one time per second rate. To stop the horn and bell sound and cause the light to operate continuously, push one of these switches : - BELL CUTOUT push-button switch on P8, - FIRE WARN lighted push-button switch on P7, - HORN CUTOUT push-button switch on P28.

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light son


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4. FIRE EXTINGUISHING. Fire extinguishers extinguish fires around the engines and APU, in lavatories, and in the passenger cabin. These are the fire extinguishing systems on the airplane : - Engine fire extinguishing system, - APU fire extinguishing system, - Lavatory fire extinguishing system, - Portable fire extinguishers.

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FIRE EXTINGUISHING EFFECTIVITY ALL

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4.1. Introduction. The engine fire extinguishing system extinguishes fires in the engine compartment. General Description. The engine fire extinguishing system floods the engine compartments with halon gas to extinguish the fire. Two fire extinguisher bottles supply the agent to either engine. Physical Description. These are the components of the engine fire extinguishing system : - Engine and AN fire control module, - Two fire extinguisher bottles, - Engine fire extinguishing ports.

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ENGINE FIRE EXTINGUISHING EFFECTIVITY ALL

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4.2. Engine Fire Extinguishing - Operation. When there is an overheat or fire condition, the fire warning switch for that engine unlocks. You can also use the warning switch override under the handle to unlock the fire warning switch. When you pull the switch up, the engine systems are shutdown and isolated for safety. Engine 1 Fire Extinguishing. When you turn the engine 1 (left) fire warning switch clockwise, the extinguisher bottle squib 1 on the R bottle operates. This breaks a seal and lets the halon gas in the R bottle to go to engine 1. If you turn the same engine fire warning switch counter-clockwise, the extinguisher bottle squib 1 on the L bottle operates. This sends the halon gas in the L bottle to go to engine 1. When an engine fire extinguisher bottle is empty, the related BOTTLE DISCHARGE light on the overheat/fire protection panel comes on. Engine 2 Fire Extinguishing. The engine 2 (right) fire extinguishing system operates the same as engine 1. The difference is that the engine 2 fire handle switch causes the discharge cartridge 2 on the L or R bottle to operate and break a seal. Training Information Point. Each fire extinguisher bottle has two extinguisher bottle squibs. The extinguisher bottle squib 1 for each bottle sends halon gas to engine 1. The engine 1 fire warning switch controls it. The extinguisher bottle squib 2 for each bottle sends halon gas to engine 2. The engine 2 fire warning switch controls it.

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ENGINE FIRE EXTINGUISHING - OPERATION EFFECTIVITY ALL

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4.3. Extinguisher Bottle. The engine fire extinguisher bottles contain the halon gas that extinguishes an engine fire. Physical Description. The engine fire extinguisher bottles are spherical. Each bottle contains halon and nitrogen at a pressure of 800 psi and a temperature of 70F (21C). These are the components of each engine fire extinguisher bottle: - Pressure gage and switch, - Safety relief port, - Two electrical connections, - Two discharge ports with squibs.

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Location. The two engine fire extinguisher bottles are in the upper aft left corner of the Left main wheel well. Operation. When you pull up and turn the engine fire warning switch, you operate the squib. The squib breaks a seal in the bottle. This causes the bottle to release the halon gas. The halon gas flows from the bottle to the selected engine compartment. You can send halon from either one, or both bottles to the same engine. If the bottle temperature increases to 266F (130C), the safety relief port ruptures. This releases the halon gas into the wheel well.

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4.4. Extinguisher Bottle Squib. The purpose of the squib is to break the diaphragm seal and start the release of the halon gas from the bottle. Physical Description. The squib is an explosive device that operates electrically. It is adjacent to a bottle diaphragm that can break. The diaphragm normally seals the pressurized bottle. Location. The squibs are in the discharge assembly at the bottom of the extinguisher bottles. Functional Description. A squib operates when you turn a fire warning switch. The explosion breaks open the diaphragm. The nitrogen pressure in the bottle pushes the halon through the discharge port. WARNING : MAKE SURE THERE ARE CAPS OR SHUNT PLUGS INSTALLED ON THE SQUIBS WHEN YOU TOUCH OR MOVE THE SQUIBS. THE SQUIB IS AN EXPLOSIVE DEVICE AND CAN CAUSE INJURY IF IT IS ACCIDENTALLY FIRED. OVERHEAT/FIRE PROTECTION PANEL

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4.5. Overheat/Fire Protection Panel. The overheat/fire protection panel monitors the fire protection system for these conditions : - Engine overheat, - Engine fire, - APU fire, - Wheel well fire, - L bottle discharge, - R bottle discharge, - APU bottle discharge, - Engine fire protection fault conditions, - APU fire protection fault conditions. The overheat/fire protection panel lets you do these functions : - Set the mode of operation (single or dual loop operation), - Operation of the fire extinguisher bottles, - Do a test of the fire extinguisher bottle squibs, - Do a test of the fire protection system, - Do a test of the fault detection circuits, - Stop the fire alarm bell. Physical Description. These are the components of the engine and APU fire protection panel : - Engine and APU fire warning switches, - OVHT DET switches, - FAULT/INOP test switch, - OVHT/FIRE test switch, - EXT TEST switch, - Bell CUTOUT switch.

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Location. The overheat/fire protection panel is on the P8 panel. Operation Displays. These are the displays on the overheat/fire protection panel : - WHEEL WELL fire warning light, comes on for a wheel well fire condition, - ENG OVERHEAT light comes on for an engine overheat condition, - Fire warning switch lights come on for an engine fire condition, - Bottle discharge lights come on when an extinguisher bottle is discharged, - FAULT light comes on to show a fault condition in the engine fire detection system, - APU DET INOP light comes on to show a fault condition in the APU fire detection system, - EXT TEST lights come on after, you do a successful squib continuity test. Operation Controls. These are the controls on the overheat/fire protection panel : - Fire warning switches show fire indication and control fire extinguisher squibs, - TEST switch lets you to do two tests. One test is for the fault detection circuits. The other test is for the fire detector loops, - OVHT DET switches let you select the mode of operation, loop A or loop B. You may also select NORMAL for both loops - EXT TEST switch lets you do a check of the extinguisher bottle squibs for continuity.

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OVERHEAT/FIRE PROTECTION PANEL

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4.6. Engine Fire Extinguishing. When there is an overheat or fire condition, the related engine fire warning switch unlocks. You can also use the warning switch override under the handle to unlock the fire warning switch. When you pull the switch up, these functions occur : - Engine fuel shut off valve closes, - Thrust reverser control power goes off, - Spar fuel valve closes, - Power to the engine driven pump low pressure warn system goes off, - Bleed air valve closes, - Hydraulic shut off valve closes, - Generator trips off. When you turn the engine 1 fire warning switch clockwise, 28v dc goes to the R bottle’s squib 1. There is an explosion of the squib. Halon gas goes from the bottle to engine 1. If you turn the same engine fire warning switch counterclockwise, 28v dc goes to the L bottle’s squib 1. This causes an explosion of the squib and sends halon gas to engine 1. When an engine fire extinguisher bottle empties, the related BOTTLE DISCHARGE light on the overheat/fire protection panel comes on. The engine 2 fire extinguishing system operates the same as engine 1. The difference is that the engine 2 fire warning switch sends 28v dc to cause explosions of the R or L bottle squib 2. Training Information Point. The fire extinguishing system receives power from the 28v dc hot battery bus. Any time you operate the fire handle switches, the related extinguisher bottle will release halon.

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4.7. Engine and APU Fire Extinguisher Test.


NOTE : You test the same APU bottle squib with the switch in the 1 or 2 position. The green test lights have a push to test function.

The engine and APU fire extinguisher test does a check for fire extinguisher bottle squib continuity. This test makes sure squib servicing is not necessary. Physical Description. The engine and APU fire extinguisher test has these components : - Three position toggle switch, spring loaded to the neutral position, - L bottle test light, - R bottle test light, - APU bottle test light. Location. The engine and APU fire extinguisher test switch is on the overheat/fire protection panel. Operation. When you set the EXT TEST switch to the 1 position, a test of these squibs occurs : - L bottle number 1 squib, - R bottle number 1 squib, - APU bottle squib. When you set the EXT TEST switch to the 2 position, a test of these squibs are occurs : - L bottle number 2 squib, - R bottle number 2 squib, - APU bottle squib. The green test lights come on to show a successful test.

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GAUCHE ET DROITE POUR LA TETE DU DECHARGE DU MOTEUR 02

ENGINE FIRE AND APU FIRE EXTINGUISHER TEST

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Functional Description. When you set the EXT TEST switch to the 1 position, power goes to the voltage regulator in the overheat/fire protection panel. The voltage regulator decreases the voltage to a level that will not cause a squib explosion. The signal from the voltage regulator closes all four switches and arms the control circuit. When the switches close the low voltage from the regulator goes to the bottle squibs. If the signal finds continuity, the control circuit causes the related bottle test light come on. NOTE : You do a test of the APU fire extinguisher bottle squibs from both position 1 or 2.

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4.8. APU Fire Extinguishing. The APU fire extinguishing system extinguishes fires in the APU compartment. General Description. When you operate the APU fire extinguishing system, it fills the APU compartment with halon gas to extinguish the fire. Physical Description. The APU fire extinguishing system has these components : - Fire extinguisher bottle, - Overheat/fire protection panel, - APU ground control panel. Location. The APU fire extinguisher bottle is in the section 48 horizontal stabilizer accessory compartment. The overheat/fire protection panel is in the flight compartment on the P8 panel. The APU ground control panel is in the right main wheel well, on the aft bulkhead.

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Operation. When there is a fire condition, the APU fire warning switch unlocks. You can also use the warning switch override under the handle to unlock the switch. When you pull the APU fire warning switch up, the APU systems are shutdown and isolated. Turn the APU fire warning switch clockwise or counterclockwise. This causes the APU fire extinguisher bottle to discharge halon gas. You can also use the APU ground control panel to operate the APU fire extinguisher bottle. When the APU fire extinguisher bottle is empty, the APU BOTTLE DISCHARGED light on the overheat/fire protection panel comes on. The APU DET INOP light and MASTER CAUTION lights come on if the APU fire detection circuits do not operate.

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4.9. APU Fire Extinguisher Bottle. The AN fire extinguisher bottle contains the halon gas that extinguishes an APU fire. Physical Description. The APU extinguisher bottle is spherical in shape. The bottle contains halon under a nitrogen pressure of 800 psi at a temperature of 70F (21C). These are the components of APU fire extinguisher bottle : - Pressure gage and switch, - Safety relief port, - Two electrical connections, - Two discharge ports with squibs. Location. The APU fire extinguisher bottle is in the section 48 horizontal stabilizer accessory compartment. Operation. The bottle releases halon when you pull up and turn the APU fire warning switch in any direction. There is a squib explosion, which breaks open a diaphragm on the bottle. The halon gas flows from the bottle to the APU compartment. If the bottle temperature increases to 266F (130C) or approximately 1800 psi, the safety relief port breaks open. This blows out the disc and discharges the halon gas into the accessory compartment.

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APU FIRE EXTINGUISHER BOTTLE

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4.10. APU Fire Extinguisher Bottle Squib. The purpose of the squib is to break the diaphragm in the bottle and start the release of the halon gas. Physical Description. The squib is an explosive device that operates electrically. It is adjacent to a bottle diaphragm that can break. The diaphragm normally seals the pressurized bottle. Location. The squib is in the discharge assembly at the bottom of the fire bottles. Functional Description. Electrical power goes to the squib during the fire extinguisher operation. An explosion of the squib opens the diaphragm. Nitrogen pressure in the bottle pushes the halon through the discharge port. WARNING : MAKE SURE THERE ARE CAPS OR SHUNT PLUGS INSTALLED ON THE SQUIBS WHEN YOU TOUCH OR MOVE THE SQUIBS. THE SQUIB IS AN EXPLOSIVE DEVICE AND CAN CAUSE INJURY IF IT IS ACCIDENTALLY FIRED. APU GROUND CONTROL PANEL

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APU FIRE EXTINGUISHER BOOTLE SQUIB EFFECTIVITY ALL

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4.11. APU Ground Control Panel. On the ground, the APU ground control panel gives you visual and aural indications of an APU fire. The control panel also lets you extinguish an APU fire. Physical Description. The APU ground control panel has these components : - Red fire warning light, - Fire horn, - Horn cutout switch, - APU fire control handle, - Bottle discharge switch. Operation. When there is a fire in the APU, the horn and light operate alternately and the APU stops. The horn does not operate in flight. When you push the horn cutout button the horn sound stops and the red light stays on continuously, as long as the APU is on fire. When you pull the APU fire control handle, the APU system stops and isolates from other systems. When you pull down the APU fire control handle, you also arm the bottle discharge toggle switch. You push the toggle switch to cause the APU bottle squib explosion.

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4.12. APU Fire Extinguishing Operation. When there is a fire condition, the APU fire warning handle switch on the engine and APU fire control panel unlocks. When you pull the APU fire warning handle switch up, a signal goes to these components : - APU generator control unit to open the APU generator breaker, - APU electronic control unit to shutdown the APU systems.


Training Information Point. The fire extinguishing system electrically connects to the 28v dc hot battery bus. Any time you operate the APU fire handle switches, the APU fire extinguisher bottle discharges. The bottle discharge switch on the P28 panel uses break-away lockwire. This wire protects against accidental operation of the fire extinguisher squib. Broken wire shows switch movement and possible squib operation.

When you turn the fire warning handle switch right or left, 28v dc goes to the APU extinguisher bottle. This causes the APU fire extinguisher bottle squib explosion to release the halon gas. You get the same results when you use the P28 APU ground control panel. When you pull the fire handle switch on the P28 panel, a signal goes to these components : - APU generator control unit to open the APU generator breaker, - APU electronic control unit to shutdown the APU systems. The bottle discharge switch also arms. The bottle discharge switch sends 28v dc to the APU extinguisher bottle. This causes the APU extinguisher bottle squib to release the halon gas. When the APU fire extinguisher bottle is empty, the pressure switch makes the APU BOTTLE DISCHARGED light on the P8 panel come on.

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APU FIRE EXTINGUISHING - OPERATION EFFECTIVITY ALL

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5. LOWER CARGO COMPARTMENT SMOKE DETECTION. The lower cargo compartment smoke detection system gives warnings in the flight deck if there is smoke in a lower cargo compartment. The warnings are for the forward and aft lower cargo compartments.

5.1. Lower Cargo Compartment Component Location. Lower Cargo Compartments. The forward lower cargo compartment has four smoke detectors and the aft Lower cargo compartment has six. The smoke detectors are in the ceiling of the cargo compartment. One smoke detector cargo electronics unit is in the ceiling of each cargo compartment inboard of the cargo door.

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Component Location. These are the components in the flight deck that have an interface with the lower cargo compartment smoke detection system : - Cargo smoke detection and fire suppression module, P8-75, - Aural warning unit, - Fire warning lights on P7. Functional Description. These are the functions of the lower cargo compartment smoke detection components on the cargo smoke detection and fire suppression module : - DETECTOR FAULT amber light is on if one or more of the detectors has a power failure. - A three-position (A, NORM, B) DET SELECT SWITCH, one for each cargo compartment. NORM position lets both detectors or with one detector failed sense smoke and give fire alarm. A or B lets the selected detector sense smoke and give fire alarm. - TEST push button switch, does a test of cargo smoke detectors and extinguishing system. - FWD, AFT red cargo fire warning switch light is on if smoke is detected in the related cargo compartment. Smoke detection in the forward or aft cargo compartment puts on the two fire lights on the P7 panel and operates the fire bell in the aural warning unit.

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TESTER LE DETECTEOR A or B

+

SI J'AI DETECTOR FAULT

LOWER CARGO COMPARTMENT SMOKE DETECTION - FLIGHT COMPT

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5.2. General Description. The forward and aft lower cargo compartments have smoke detectors in a dual Loop configuration and a smoke detector electronics unit. The smoke detectors monitor the cargo compartment air for smoke. Interface. The lower cargo compartment smoke detection system has these interfaces : - Aural warning unit, - Cargo smoke detection and fire suppression module. General Operation. If there is smoke in the lower cargo compartment, the smoke detector electronics unit causes a cargo fire warning alarm. The fire warning bell operates and the fire lights come on. The FWD or AFT cargo fire warning light on the cargo smoke detection and fire suppression module come on. System Tests. The smoke detector electronics unit has built-in test equipment (BITE). The BITE does power-up and periodic tests of the system. You can also use the cargo fire test switch to do a test of the system.

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5.3. Smoke Detector. The smoke detectors monitor air in the Lower forward and aft cargo compartments for smoke. Physical Description. The forward and aft lower cargo smoke detectors are identical. The smoke detectors have these components : - One electrical connector, - Four shock mounts, - Smoke detection chamber (internal), - Electronic circuit. The smoke detectors use photoelectric cells to detect smoke. Location. The smoke detectors are in pans in the ceiling of the forward lower cargo compartment and in the aft lower cargo compartment. Training Information Point. The smoke detector is an LRU. There is no scheduled maintenance of the cargo smoke detectors. The forward lower cargo smoke detectors and the aft lower cargo smoke detectors are interchangeable. Four bolts attach the smoke detector to the structure.

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SMOKE DETECTOR

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5.4. Cargo Electronic Unit. The cargo electronics units monitors the forward and aft lower cargo compartment smoke detectors. Physical Description. The forward and aft cargo electronic units are identical. The cargo electronic units have these components : - Two electrical connectors (at back of unit), - Two attachment brackets, - 16 red light emitting diodes (LEDs), - Lamp test switch, - System test switch, - Electronic circuits, - Translucent fiberglass cover with eight fasteners. Location. The cargo electronic units are in the ceiling of the forward lower cargo compartment and in the aft lower cargo compartment. Training Information Point. The cargo electronic unit is an LRU. There is no scheduled maintenance of the cargo electronic units. The forward lower cargo electronic unit and the aft lower cargo electronic unit are interchangeable. Six bolts attach the unit to the structure.

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5.5. Bottle Discharge Circuit. The smoke detectors in the forward and aft lower cargo compartments are monitored by the cargo electronic units (CEU). This unit processes inputs from smoke detectors and interfaces with the components in the flight compartment. General Operation. If smoke is detected in the cargo compartment, the detector sends an alarm signal to the CEU. The CEU sends the alarm signal to the cargo smoke detection and fire suppression panel. These are the alarm indications : - FWD or AFT red fire light comes on, - FIRE lights comes on, - Fire bell operates. If the detector does not operate, the CEU sends the fault signal to the cargo smoke detection and fire suppression panel. The DETECTOR FAULT amber light comes on for a fault indication. Training Information Point. You can do a test of the smoke detection and fault indication with the test switch on the cargo smoke detection and fire suppression module.

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5.6. Training Information Point. The Lower cargo smoke detection system uses these components : - Cargo smoke detection and fire suppression module, P8-75, - Two cargo electronic units (CEU), - Smoke detectors. In the forward cargo compartment with four smoke detectors (2 loop A and 2 loop B), only lights 1A, 1B, 2A and 2B connect to the smoke detectors. The other lights are active and connect externally by a jumper cable Loop. In the aft cargo compartment with six smoke detectors (3 loop A and 3 loop B), only lights 1A, 1B, 2A, 2B, 3A and 3B connect to the smoke detectors. The other lights are active and connect externally by a jumper cable loop.

Smoke Detection Test (P8-75). The smoke detection system test is done from the flight compartment. These are the results of the test : - TEST, 2 EXT FWD, AFT green lights come on - FWD and AFT red switch lights come on - DISCH amber light comes on - FIRE red lights come on and bell rings. At the same time, on the CEU, all 16 red lights come on. If the FWD or AFT red switch light does not come on, select A or B on DET SELECT switch and do the test again. A red Light on the CEU not on shows you which detector is failed or a problem with the external jumper loop. During these tests, you can see the red lights on CEU through the fiberglass cover.

Smoke Detection Test (CEU). Before you do the smoke detection test with the CEU, remove the fiberglass cover. These are the results of the test : - LAMP TEST, if any of the 16 red lights do not come on, change the CEU, - PRESS TO TEST, all 16 red lights come on, test passed. If during test, the red light does not come on, change smoke detector or check jumper cable. At the same time, on p8-75, the DETECTOR FAULT amber light is on. At the same time, these show on P8-75 : - 2 EXT FWD, AFT green lights come on - FWD and AFT red switch lights come on - DISCH amber light comes on.

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TRAINING INFORMATION POINT

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6. LOWER CARGO COMPT FIRE EXTINGUISHING The lower cargo fire extinguishing system extinguishes fires in the forward or aft lower cargo compartments. General Description. The Lower cargo fire extinguishing system has these components : - One fire extinguishing bottle, - Five discharge nozzles. - Filter driers, for airplanes equiped with two bottles - optional The fire extinguishing bottle contains halon 1301 fire extinguishing agent pressurized with nitrogen. Tubing connects the bottle to the discharge nozzles in the cargo compartment ceilings.

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6.1. Component Locations. The lower cargo compartment fire extinguishing bottle is in the air conditioning distribution bay. The bottle is on the left side of the air conditioning mix chamber. It attaches to a bracket on the aft bulkhead. The bottle has two discharge assemblies (squibs) connected to the discharge tubing. The discharge tubing sends extinguisher to the forward and aft cargo compartments.

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LOWER CARGO COMPT FIRE EXTINGUISHING

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6.2. Fire Extinguishing Bottle. The lower cargo fire extinguishing bottle contains the fire extinguishing agent. Physical Description. The bottle contains halon fire extinguishing agent pressurized with nitrogen. The bottle weighs approximately 33lb (15 kg). The fire extinguishing bottles have these components : - Safety relief and fill port, - Two handles, - Pressure switch with test button, - Three mounting brackets, - Two discharge assemblies with squibs. Functional Description. The discharge assembly has an explosive squib which releases the halon through the discharge port. The pressure switch monitors the pressure in the bottle. When the bottle pressure decreases to less than 250 psi, the switch sends a signal to the flight compartment for indication. The pressure switch test is by a push of the test button on the switch. This simulates low pressure and sends a signal to the flight compartment for indication. The safety relief and fill port is a single fitting on the bottle. The safety relief opens to make sure the bottle does not break if internal pressure is too high.

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FIRE EXTINGUISHING BOTTLE EFFECTIVITY ALL

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6.3. Flight Compartment /Component. Component Location. The component in the flight deck that has an interface with the lower cargo compartment fire extinguishing system is the cargo smoke detection and fire suppression module, P8-75. Component Functional Description. These are the functions of the lower cargo compartment extinguishing components on the module : - ARMED white indication is on after you push the FWD or AFT red cargo fire warning switch light, - Guarded DISCH amber switch light to discharge extinguisher bottle and bottle discharge indication, - TEST pushbutton switch, does a test of the extinguishing system and cargo smoke detectors, - FWD, AFT green EXT Lights are on during the extinguisher test.

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FLIGHT COMPARTMENT COMPONENT

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6.4. Bottle Discharge Circuit Operation. Bottle Discharge. Push the forward or aft cargo fire arm switch to arm the cargo fire extinguishing system. Push the cargo fire discharge switch for at least one second. The switch lets power from the hot battery bus go to the bottle forward or aft squib. The bottle discharges extinguishing agent to the affected cargo compartment to provide fire suppression for 60 minutes. Discharge Indication. When pressure inside a bottle decreases, the bottle pressure switch closes and makes a ground. The amber DISCH light comes on. Training Information Point. You can do a test of the pressure switch by a push of the test button on the switch. The pressure switch closes and makes a ground. The amber DISCH light comes on. If light does not come on, change the switch.

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6.5. Bottle Discharge Test Circuit. You can do a test of the lower cargo compartment extinguisher bottle discharge squibs and the DISCH amber light. You use a test switch on the cargo smoke detection and fire suppression panel. A test switch on the cargo electronic units also does a test of these components. General Operation. When you push the test switch, 28v dc from the hot battery bus goes through the transistor switch to connect ground to the DISCH light and the light comes on. Also, 28v dc goes to logic circuits for the squibs. If the squibs have continuity, the two EXT FWD and AFT green lights come on. If the light does not come on during the test, do a check of the circuit or change the bottle. Training Information Point. The two EXT FWD and AFT lights are press-to-test. The DISCH amber light is not press-to-test.

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7. LAVATORY SMOKE DETECTION. The Lavatory smoke detection system alerts the flight crew to smoke conditions in the lavatories. General Description - Smoke Detector. A green indicator light comes on when a smoke detector has power. When there is smoke in the lavatory, the detector red alarm indicator light comes on and the detector horn sounds.

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7.1. General Description. The lavatory smoke detection system monitors for smoke in the lavatories. A green indicator light comes on when a smoke detector has power. When there is smoke in a lavatory, the detector gives these alarm indications : - Detector alarm indicator light comes on, - Detector gives a horn sound, - Optional P5 panel SMOKE light comes on. Physical Description. The smoke detector assembly has these components : - Alarm horn, - Alarm indicator, - Electrical connector, - Power indicator, - Interrupt switch, - Self test switch, - Smoke sensor. The sensor unit has a red alarm indicator. It supplies a visual indication when the unit detects smoke.

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7.2. Interface. The smoke detectors are modular units. There is a detector in each lavatory. Interface - Power. The smoke detector requires 28v dc from the P18 panel for system operation. Smoke Detector. A green indicator light comes on when a smoke detector has power. When there is smoke in the lavatory, the detector red alarm indicator light comes on and the detector horn sounds.

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LAVATORY SMOKE DETECTION INTERFACE

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8. WHEEL WELL OVERHEAT DETECTION The wheel well fire detection system detects high temperatures in the main wheel well and sends an alert to the flight crew.

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WHEEL WELL OVERHEAT DETECTION

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8.1. General Description. These are the major components of the wheel well fire detection system : - Wheel well fire detector elements, - Compartment overheat detection control module, - Overheat/fire protection panel. Detector elements in the main wheel well supply the wheel well fire detection signal. The signal goes to the compartment overheat detection control module. This module sends the fire alarm signal to the flight compartment.

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8.2. Overheat Detector Element. The overheat detector elements monitor for high temperature conditions. Physical Description. The detector element has a single strand of nickel wire embedded in insulation. The insulation is impregnated with a salt compound and is in a tube. The detector elements have these components : - Nickel wire, - Insulation, - Electrical connector, - Tube. The detector element attaches to the ceiling of the wheel well by quick-release fasteners.


Training Information Point. The minimum bend radius for the sensor elements is one inch (2.5 cm). If possible, do not bend the element in a radius less than three inches (8 cm). Detector elements are in clamps with color-coded bushings. The detector end brackets have collars that prevent the detector from twisting when the electrical connectors are put on. CAUTION : DO NOT MAKE THE PERMITTED DENTS OR KINKS STRAIGHT. DAMAGE TO THE TUBING CAN OCCUR. NOTE : Smooth dents and kinks that do not decrease the diameter of the tubing are permitted. NOTE : Make sure there is at least 0.50 inch (1.5 cm) between the element and the structure except at the mounting clips.

Operation. The detector element is a thermistor type with resistance inversely proportional to temperature. As the element temperature rises, its resistance is lowered. If any portion of the sensing element is heated above alarm temperature, the element resistance drops sharply. The single wire in the center of the core is the power lead and the outside tube is electrically grounded. The insulating resistance of the core material decreases suddenly at the alarm temperature. Current flows through the core material to ground when alarm temperature is sensed.

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8.3. Compartment Overheat Detection Ctl. Module. The compartment overheat detection control module monitors detectors in the wheel well and the wing and body areas for overheat and fire conditions. Physical Description. The control circuits for the wheel well fire detection and the wing/body overheat detection are in the module. The front panel has these components :


Training Information Point. The non-volatile memory provides a storage area for 10 faults / alarms. Failure of the control cards, power supply card, loss of AC or DC power are not stored. These failures are coded 00 to 05. Short circuit faults are stored as alarm codes.

- MAINT ADV light, - LED display, - BITE instructions, - Four BITE control switches. Location. The compartment overheat detection control module is in the electronic equipment compartment on the E1-4 rack. Operation. For normal conditions, the MAINT ADV light is off. When the MAINT ADV light comes on, it shows there is fault data stored in memory. The light stays on until you correct the problem and clear the memory. Use the BITE functions to find the fault or alarm condition. These are the functions of the BITE control switches : - LOC TEST switch starts a self-test, - MEM READ switch shows the fault code for the last item kept in memory, - MEM CLEAR switch erases the non-volatile memory. You can not erase current faults and alarms until corrected - DISP TEST switch makes sure the control circuits operate correctly.

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Operation. The compartment overheat detection control module supplies power to the detector elements. The microprocessor monitors the wheel well detector elements for alarm conditions. If the microprocessor senses a wheel well fire, it keeps the alarm in memory and sets the fire condition. These are the indications of a wheel well fire : - P7 fire warn light comes on, - P8 wheel well light comes on, - Aural warning unit gives a bell sound, - MAINT ADV light comes on. Push the P7 FIRE WARN lighted push-button switch or the P8 BELL CUTOUT switch to stop the bell sound and turn off the P7 FIRE WARN lights. The P8 WHEEL WELL light stays on until the alarm condition goes off. Push the OVHT/FIRE test switch to start a test of the wheel well fire detection system. The test alarm inputs are not kept in memory. Training Information Point. 115v ac power must be on to do a test of the wheel well fire detection system.

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8.4. Wheel Well Overheat Detection Operation. Detector elements in the main wheel well supply the wheel well fire detection signal. The signal goes to the compartment overheat detection control module. This module supplies the fire alarm. These are the flight compartment indications of a wheel well fire : - P8-1 WHEEL WELL light comes on, - P7 FIRE WARN light comes on, - P9 AURAL WARNING UNIT gives a bell sound. To stop the bell sound, push one of these switches : - P8 panel BELL CUTOUT push-button, - P7 panel FIRE WARN light, - P28 APU ground control panel. If you have a wheel well fire alarm, the MAINT ADV light on the compartment overheat detection control module comes on.

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9. WING AND BODY OVERHEAT DETECTION The wing and body overheat detection system monitors for overheat conditions caused by pneumatic duct Leaks. When it’s detectors sense this condition, they are shown in the flight compartment on the P5 and P7 panels.

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9.1. General Description. These are the major components of the wing and body overheat detection system : - Wing/body overheat detector elements, - Compartment overheat detection control module. The construction and operation of the wing/body overheat elements are the similar to the wheel well elements. The alarm temperature setpoints are different for the wing and body overheat detection sense elements. Elements actuate at approximately 255F (124C) for these areas of the airplane :


Training information Point. The minimum bend radius for the sensor elements is one inch (2.5 cm). If possible, do not bend the element in a radius less than three inches (8 centimeters). NOTE : Make sure there is at least 0.50 inch (1.5 cm) between the element and the structure except at the mounting clip. CAUTION : DO NOT MAKE THE PERMITTED DENTS OR KINKS STRAIGHT. DAMAGE TO THE TUBING CAN OCCUR. NOTE : Smooth dents and kinks that do not decrease the diameter of the tubing are permitted.

- Aft cargo compartment, - Right and left air condition compartment, - Keelbeam. Elements actuate at approximately 310F (154C) for these areas of the airplane : - Engine strut cavities, - Wing leading edge.

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9.2. Compartment Overheat Detection Ctl. Module. The compartment overheat detection control module monitors detector components for overheat and fire conditions in the wheel well and the wing and body areas. Physical Description. The control circuits for the wheel well fire detection and the wing and body overheat detection are in the module. The front panel has these components: - MAINT ADV. light - LED display - BITE instructions - Four BITE control switches. Location. The compartment overheat detection control module is in the electronic equipment compartment on the E1-4 rack. Operation. For normal conditions, the MAINT ADV light is off. When the MAINT ADV light comes on, it shows there is a fault or an alarm condition. You then use the BITE functions to find the fault or alarm condition. These are the functions of the BITE control switches : - LOC TEST switch starts a self-test - MEM READ switch shows the fault code for the last item kept in memory - MEM CLEAR switch erases the non-volatile memory. - DISP TEST switch makes sure the control circuits operate correctly. Training Information Point. You cannot clear the memory until you repair the fault.

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9.3. Control Module Operation. Functional Description. The compartment overheat detection control module supplies power to the detector elements. The microprocessor monitors the wing/body detector elements for overheat conditions. If the microprocessor senses a wing/body overheat condition it holds the alarm in memory and sets the alarm condition. These are the indications of a wing/ body overheat condition : - Related P5 wing-body overheat light comes on - P7 master caution and AIR COND lights comes on - MAINT ADV Light comes on. Push and hold the P5 OVHT TEST switch for 5 seconds to start a test of the wing and body overheat detection system. If the test is successful, the two P5 wing-body lights and the P7 master caution lights come on.

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9.4. Wing And Body Overheat Detection Operation. The wing and body overheat detection components monitor for overheat conditions. If they sense an overheat condition, a signal goes to the compartment overheat detection control module. This module sets the overheat alarm. These are the flight compartment indications for a wing and body overheat condition : - P5 wing-body overheat light comes on, - P7 master caution light comes on, - P7 AIR COND annunciator Light comes on. If there is an overheat condition, the MAINT ADV light on the compartment overheat detection control module comes on.

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10. LAVATORY FIRE EXTINGUISHING. The lavatory fire extinguishing system extinguishes fires under the wash basin and trash bin area. Physical Description. The lavatory extinguishing system has these components : - Fire extinguisher bottle, - Temperature sensors, - Temperature indicator strip. Location. The lavatory fire extinguishing systems are in the lavatories under the wash basin. Operation. The extinguisher bottle has two discharge ports. The ports have eutectic plugs. These plugs melt at high temperatures. When there is an overheat or fire condition, this occurs : - Temperature indicators change color, - The eutectic plug melts, - The extinguisher releases inert gas to stop the fire.

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11. PORTABLE FIRE EXTINGUISHING There are portable fire extinguishers to extinguish fires inside the airplane. There are two types of extinguishers, water-type and halon. The halon extinguishers are for electrical and flammable liquid fires. The water-type extinguishers are for solid combustible fires. Location. There are extinguishers in these areas : - Flight compartment, - Galley, - Passenger compartment. Placards identify all of the extinguisher locations.

Operation. To operate the water-type extinguisher, turn the handle and push the trigger. To operate the halon extinguisher, remove the handle lock pin and push the handle. Training Information Point. After you use the water-type extinguisher, you must fill it again and replace the cartridge. If the handle lock pin on the Halon extinguisher is not there, you must weight the extinguisher to find out if it is not full. The pressure gage is not a satisfactory check of the extinguisher.

Physical Description. The water-type extinguishers contain a water and antifreeze mixture. Each water extinguisher has these parts : - Trigger (discharge valve), - Water cylinder, - Handle with internal gas cartridge, - Discharge nozzle, - Quick-release mounting strap. Each Halon extinguisher has these parts : - Pressure gage - Halon cylinder - Trigger - Discharge nozzle - Handle lock pin - Handle. EFFECTIVITY ALL

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