BHT-412-MM-1
CHAPTER 1 — INTRODUCTION TABLE OF CONTENTS Paragraph Number
Chapter/Section Number
Title
Page Number
INTRODUCTION 1-1 1-1 1-2 12 1-3 13 1-4 14 1-5 1-6 16 1-7 17 1-8 1-9 19 1-10 110 1-11 111 1-12 112 1-13 113 1-14 114 1-15 115 1-16 116 1-17 117 1-18 118 1-19 119 1-20 120
Scope Scop e of th this is Ma Manu nual.. al.... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... Use Us e of th this is Ma Manu nual.. al.... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... Cust Cu stom omer er Co Comm mmen entts. s... ...... ...... ...... ....... ...... ...... ...... ....... ...... ...... ...... ...... ...... ....... ...... ...... ...... ...... Cont Co nte ent and Ar Arrran ange gem men entt .. ...... ...... ....... ...... ....... ...... ...... ...... ....... ...... ....... .... ....... ...... ....... .... .... .... Revision Status and List of Effective Pages. s.......................... Volu Vo lume mes s an and d Ch Chap apte terrs.. s....... ...... ....... ...... ...... ...... ...... ...... ....... ...... ...... ...... ....... ...... ...... ...... ...... Tabl Ta ble e of Co Cont nten ents.. ts.... ....... ...... ...... ...... ...... ...... ....... ...... ...... ...... ....... ...... ...... ...... ...... ...... ....... ...... ...... Paragraph, Page, Figure, and Table Numbering.................. Bull Bu llet etin ins s .. .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... Temp Te mpor orar ary y Re Revi visi sion ons.. s.... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... Cons Co nsum umab able le Ma Mate teri rial als... s..... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .. Spec Sp ecia iall To Tool ols s .. .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... Torq To rque ues s .. .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... Comm Co mmon only ly Us Used ed Sy Symb mbol ols s .. .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... Term Te rmin inol olog ogy.. y.... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... War arni ning ngs, s, Ca Caut utio ions ns an and d Not otes. es..... ....... .... ........ .... ....... .... .... ...... ....... ...... ....... ...... ...... Stan St anda dard rd Pr Prac acti tice ces s .. .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .. Repl Re plac acem eme ent Pa Part rts s and As Asse semb mbli lies. es..... ...... ....... ...... ....... .... ........ ...... ....... ...... ...... ....... Wear We ar Li Limi mits. ts... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... Heli He lico copt pter er De Desc scri ript ptio ion n .. .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... ....
1-00-0 1-00 -00 0 1-00 100-0 -00 0 1-00 100-0 -00 0 1-00 100--00 1-00-00 1-00 100-0 -00 0 1-00 100-0 -00 0 1-00-00 1-00 100-0 -00 0 1-00 100-0 -00 0 1-00 100-0 -00 0 1-00 100-0 -00 0 1-00 100-0 -00 0 1-00 100-0 -00 0 1-00 100-0 -00 0 1-00 100-0 -00 0 1-00 100-0 -00 0 1-00 100-0 -00 0 1-00 100-0 -00 0 1-00 100-0 -00 0
3 3 3 3 3 3 4 4 4 4 4 5 5 5 5 5 5 5 7 7
FIGURES Fi Figure Number 1-1 1-1 1-2 12
Page Number
Title Common Comm only ly Us Used ed Sym Symbo bols ls .. .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .. Mode Mo dell 41 412 2 Ser Serie ies s He Helic licop opte terr (T (Typ ypic ical). al)... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... ....
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INTRODUCTION 1-1.
SCOPE OF THIS MANUAL
This Maintenance Manual (MM) gives the data that is needed to do the maintenance and repair of model 412 helicopters S/N 33001 through 33213 and S/N 36001 and subsequent. The MM should be used in conjunction with two other Model 412 helicopter publications: the Illustrated Parts Breakdown manual (BHT-412-IPB) and the Component Repair and Overhaul manual (BHT-412-CR&O). This MM is backed by other Bell Helicopter publications. These other publications are also used on other helicopter models. These other publications are: the Special Tools Illustrated Parts Breakdown (BHT-SPECTOOL-IPB), the Standard Practices Manual (BHT-ALL-SPM), the Electrical Standard Practices Manual (BHT-ELEC-SPM), the Structural Repair Manual (BHT-MED-SRM), and the Corrosion Control Guide (CSSD-PSE-87-001). NOTE For helicopters S/N 34001 through 34024, use information contained within this manual applicable to S/N 33108 through 33213 and S/N 36001 through 36019. Generally, information applicable to S/N 36020 through S/N 36086 applies to S/N 34025 and subsequent. For specific differences in S/N 34025 and subsequent, for instruments, electrical and avionics, refer to NB-412-MM basic maintenance manual. Copies of this manual may be obtained from: PT. INDUSTRI PESAWAT TERBANG NUSANTARA (PT. IPTN) P.O. BOX 3752 JAKARTA, INDONESIA TELEX: 61393 IPTNIK IA TELEFAX: 310008
1-2.
USE OF THIS MANUAL
The instructions that are given in this manual and those that have been changed by Alert Service Bulletins, issued by Bell Helicopter Textron Inc., and by Airworthiness Directives, issued by the local Aviation Authority, shall be strictly followed.
Export Classification C, ECCN EAR99
1-3.
CUSTOMER COMMENTS
Bell Helicopter Textron Inc. strives to give you, the customer, accurate and straightforward manuals. Sometimes, we may make mistakes. If you find any mistakes, we would appreciate it if you told us. Your observation, suggestion, or complaint will be acknowledged. For your convenience, we include a Customer Feedback Form at the beginning of this manual. You can send it by fax or mail it to us. When you tell us about a mistake that is found in the Maintenance Manual, please be as specific as possible. Your help to make sure that the manual is correct is very much appreciated.
1-4.
CONTENT AND ARRANGEMENT
The breakdown of the helicopter by systems in this manual is done under the Airline Transportation Association (ATA) chapter system. The manual is separated into 13 volumes and 33 chapters to make it easy to find data. 1-5.
REVISION STATUS EFFECTIVE PAGES
AND
LIST
OF
The revision status of the manual is given on the log of revisions (page A) and on the title page of the manual. The log of pages gives the revision status of every page in the manual. 1-6.
VOLUMES AND CHAPTERS
A volume groups the chapters into general categories to permit quick access to data. •
VOLUME 1 — GENERAL INFORMATION
•
Chapter 1 — Introduction
•
VOLUME 2 — HANDLING AND SERVICING
•
Chapter 4 — Airworthiness Limitations Schedule
•
Chapter 5 — Inspections
•
Chapter 6 — Dimensions and Charts
•
Chapter 7 — Lifting and Jacking
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•
Chapter 8 — Weight and Balance
•
Chapter 9 — Towing
•
Chapter 10 — Parking and Mooring
•
Chapter 11 — Placards and Markings
•
Chapter 12 — Servicing
•
Chapter 18 — Vibration and Noise
•
VOLUME 3 — EQUIPMENT
•
Chapter 21 — Air Distribution (Ventilation)
•
Chapter 25 — Equipment and Furnishings
•
VOLUME 10 — INSTRUMENTS/ ELECTRICAL
•
Chapter 95 — Instrument System
•
Chapter 96 — Electrical System
•
VOLUME 11 — AVIONICS
•
Chapter 97 — Avionics
•
VOLUME 12 — WIRING DIAGRAMS
•
Chapter 98 — Wiring Diagrams
•
VOLUME 13 — KITS
•
Chapter 99 — Kits
•
Chapter 26 — Fire Protection
•
VOLUME 4 — FUEL/HYDRAULICS
•
Chapter 28 — Fuel System
•
Chapter 29 — Hydraulic System
•
VOLUME 5 — AIRFRAME
•
Chapter 30 — Ice and Rain Protection
•
Chapter 32 — Landing Gear
•
Chapter 52 — Doors and Windows
•
Chapter 53 — Fuselage
•
VOLUME 6 — MAIN ROTOR/MAIN ROTOR DRIVE SYSTEM
•
Chapter 62 — Main Rotor
•
Chapter 63 — Main Rotor Drive System
•
VOLUME 7 — TAIL ROTOR/TAIL ROTOR DRIVE SYSTEM
Technical Bulletins (TBs) and Alert Service Bulletins (ASBs) are published when they are necessary. These documents supplement the Maintenance Manual and give instructions and data to change components, systems, and maintenance practices on the helicopter. When a bulletin affects the way the helicopter is maintained, it is incorporated in the manual at the next available opportunity. Refer to the Bulletin Record (page BR) for the list of bulletins that have been incorporated in this manual.
•
Chapter 64 — Tail Rotor
1-10.
•
Chapter 65 — Tail Rotor Drive System
•
VOLUME 8 — FLIGHT CONTROLS
•
Chapter 67 — Flight Controls
Temporary revisions are published when necessary. Refer to the Temporary Revision Record (page TR) for a listing of active temporary revisions against this manual.
•
VOLUME 9 — POWER PLANT
1-11.
•
Chapter 71 — Power Plant
•
Chapter 76 — Engine Controls
•
Chapter 79 — Engine Oil System
1-7.
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TABLE OF CONTENTS
To locate the required i nformation, every chapter has a table of contents. 1-8.
PARAGRAPH, PAGE, FIGURE, AND TABLE NUMBERING
Paragraphs, pages, figures, and tables start at the number 1 within a chapter.
1-9.
BULLETINS
TEMPORARY REVISIONS
CONSUMABLE MATERIALS NOTE
Handling, storage, and safety precautions concerning consumable materials shall be
Export Classification C, ECCN EAR99
BHT-412-MM-1
in accordance with manufacturers instructions unless otherwise specified in this manual. The consumable materials that are necessary for you to do maintenance tasks are given by name and by item number in the text: for example, “solvent (C-304)”. The number refers to the item 304. The data on this item 304 is found in Table 13-2 in Chapter 13 of Standard Practices Manual (BHT-ALL-SPM). On occasion, the materials that are used in maintenance tasks will change properties, change suppliers, or be discontinued. Also, new improved materials become available. If there is ever a difference between the Maintenance Manual and Standard Practices Manual, the manual that has the latest date of issue shows the preferred material. However, either material may be used for the maintenance task unless it is stated otherwise in the procedure.
1-12.
SPECIAL TOOLS
Some maintenance procedures require the use of special tools. These tools are given in a table at the beginning of the applicable maintenance paragraph. A description and illustration of these tools are found in the Special Tools Illustrated Parts Breakdown Manual (BHT-SPECTOOL-IPB).
1-13.
TORQUES
Where applicable, special torques are specified within the text (or on illustrations) within this manual. When a torque value is not shown, then the standard torque value for that combination of fasteners shall be used. Standard torque values for various combinations of fasteners are found in the Standard Practices Manual (BHT-ALL-SPM).
1-15. TERMINOLOGY 1-16.
WARNINGS, CAUTIONS AND NOTES
WARNING
IF YOU DO NOT FOLLOW THE INSTRUCTIONS THAT ARE GIVEN IN A WARNING, PERSONAL INJURY CAN OCCUR.
CAUTION IF YOU DO NOT FOLLOW THE INSTRUCTIONS THAT ARE GIVEN IN A CAUTION, YOU CAN CAUSE DAMAGE TO THE HELICOPTER OR TO THE COMPONENTS.
NOTE A note includes supplemental data about the procedure, the practice, the condition, etc. for the maintenance task that you do. 1. Warnings, cautions and notes are used throughout this manual to emphasize important and critical instructions.
1-17. STANDARD PRACTICES Standard maintenance practices and procedures that are not given in this manual are found in the Standard Practices Manual (BHT-ALL-SPM) and the Electrical Standard Practices Manual (BHT-ELEC-SPM).
1-14. COMMONLY USED SYMBOLS Some illustrations have symbols to highlight common processes such as the application of sealant, primer, corrosion preventive compound. Other processes are the use of heat, assembly fluid, or unreduced wet primer. Figure 1-1 shows some of the symbols used. Always use the consumable material (C-XXX) which is called out (paragraph 1-11).
1-18. REPLACEMENT PARTS AND ASSEMBLIES Replacement parts and assemblies that are necessary for the correct and proper maintenance of the helicopter and its components are given in the Illustrated Parts Breakdown Manual (BHT-412-IPB).
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Figure 1-1. Commonly Used Symbols
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1-19.
WEAR LIMITS
CAUTION
THE METRIC EQUIVALENTS TO U.S. STANDARD WEIGHTS AND MEASURES A RE G I V E N I N T H I S M A N U A L . HOWEVER, USE ONLY THE U.S. STANDARD VALUES WHEN YOU TAKE A MEASUREMENT TO ESTABLISH A SPECIFIC DIMENSION OR TO FIND THE SERVICEABILITY OF A COMPONENT. 1. Throughout this manual, wear limits are given to show the required fit between the mating parts. It is not intended that all dimensions be examined as a prescribed maintenance procedure. However, you must examine the dimensions of parts that show signs of wear or physical damage. 2. Wear limits, fits, and tolerances are integrated into the inspection, repair, and assembly procedures. 3. Unless otherwise specified, dimensions shall carry the following tolerances on decimals:
DECIMAL
TOLERANCE
.XXX
±0.010 inch
.XX
±0.03 inch
.X
±0.1 inch
1-20.
HELICOPTER DESCRIPTION
The Model 412 SERIES Helicopter (Figure 1-2) consists of two major assemblies: The forward
fuselage and the tailboom. The forward fuselage is of semimonocoque and reinforced shell construction with transverse bulkheads and metal and fiberglass covering. Two longitudinal main beams provide the primary structural support. A hinged door on either side of the forward area permits direct access to the crew area and a large sliding door permits access to the cargo/passenger area. Additionally, a hinged cargo door is located immediately ahead of the sliding door. This door increases the width of access to the cargo/passenger area. Seating is provided for the pilot and forward passenger/copilot in the crew area (cockpit) and up to 13 passengers in the cargo/passenger (cabin) area. The engine deck, located above and aft of the passenger/cargo area, is designed to accommodate the engines, reduction (combining) gearbox, firewalls, and air management system. The tailboom is of semimonocoque construction which provides support for a vertical fin, aerodynamically actuated elevator, tail rotor and tail rotor drive system, tail skid, and baggage compartment. The powerplant is a Pratt and Whitney of Canada, Ltd. PT6T-3 series twin turboshaft (Twin-Pac) engine consisting of two identical free turbine po wer sections. A common reduction (combining) gearbox mounted across the aft end of the power sections has an engine-to-transmission output shaft (main driveshaft) extending forward along the centerline of the engine to provide power to the transmission. The main rotor system is a soft-in-plane, flex-beam type with four interchangeable blades. For storage and handling, two of the blades may be folded back along the fuselage. When folded, the blades do not extend beyond the width of the fuselage.
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Figure 1-2. Model 412 Series Helicopter (Typical)
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