Instructions and diagrams of Toyota engines. Makes and models include Camry, Corolla, Celica, Tercel, Paseo, Avalon and more. Engine Types include; 5E-FE, 1NZ-FE, 7A-FE, 1ZZ-FE and many more.
Manual de Oficina Renault Megane III
Descripción: Apu - Arquitectura
Descripción completa
APU and Engine
APU Auxiliary Power System The auxiliary power unit (APU) supplies electrical and pneumatic power to the airplane. The APU can start at all altitudes up to 41,000 feet. Electrical power is available up to 41,000 feet. Pneumatic power is available up to 17,000 feet. The APU is an AlliedSignal 131-9(B). The APU has these features: • • • •
The electronic control unit (ECU) controls and monitors all phases of APU operation. It also stores system and fault information.
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APU Components
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APU Engine - Operation – Start The APU electronic control unit (ECU) controls these components: • • • • •
APU inlet door APU fuel shutoff valve APU fuel Ignition APU start system
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APU and Engine
APU Control and Indication The ECU controls these APU functions: • • • • • • • • •
Start and ignition Fuel control Surge control Inlet guide vane control Normal shutdown Protective shutdown APU indications BITE/fault recording Data storage
The APU switch on the P5 panel controls normal APU start and shutdown.
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Airborne Auxiliary Power - Protective Shutdown A protective shutdown prevents damage to the APU or the airplane. The ECU controls the automatic protective shutdown of the APU. If the ECU finds a fault, it does a protective shutdown. The cause for the shutdown shows on the control display unit (CDU) on the P9 panel.
APU – Protective Shutdown
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APU BITE and Maintenance Indications The ECU sends real time and recorded fault information to the captain and first officer control display unit (CDU).
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APU and Engine
Engine CFM56-7 Engine Characteristics Summary The 737 airplane uses two CFM56-7 high bypass-ratio turbofan engines that attach to the wing. The engines have several thrust ratings. The engine is an axial flow turbofan with two spools. The engine has a low and high pressure section. The low pressure section has these features: • • • •
A single-stage fan A three-stage low pressure compressor Titanium wide-chord fan blades Four-stage low pressure turbine
The high pressure section has these features: • •
Nine-stage high pressure compressor Single-stage high pressure turbine
The main gearbox supplies power for aircraft and engine accessories. The main gearbox attaches to the side of the fan case. The high pressure section drives the gearbox.
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APU and Engine
Engine - General Description The CFM56-7 is a high bypass, dual rotor, axial flow turbofan engine. The engine fan diameter is 61 inches (1.55 meters). The bare engine weight is 5257 pounds (2385 kilograms). The engine has these sections: • • • • • •
Fan and booster or low pressure compressor (LPC) High pressure compressor (HCP) Combustor High pressure turbine Low pressure turbine (LPT) Accessory drive
The fan and booster rotor and the LPC rotor are on the same low pressure shaft (N1). The HPC rotor and the HPT rotor are on the same high pressure shaft (N2).
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APU and Engine
Air Bleed System Bleed air supply comes from the high pressure compressor for these systems: • • •
Air conditioning Cabin pressurization Wing and engine inlet cowl anti-ice
Air comes from the fifth stage of the compressor at high power settings. Air comes from ninth stage at low power settings. Fan air cools the bleed air in the pre-cooler. Fan air also cools the integrated drive generator (IDG).
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APU and Engine
Engine Controls (Start) The engine start system uses air pressure and electric power for starter operation. The engines can start with air from any one of these sources: • • •
APU Ground source Engine crosses bleed
The start lever for each engine is on the control stand. In the IDLE position, the start lever energizes the ignition system and permits fuel flow.
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Thrust Reversers The thrust reversers (TRs) use electrical control. The TRs operate with hydraulic power. Both TRs are interchangeable between the two engines except for the cascades. Reverse thrust occurs with a change of fan air direction. When the thrust reversers deploy, the blocker doors close and fan air goes out radially and forward.
