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BHT-41 2-SI-45

2211MODEL 412SERVICE INSTRUCTION

FORCOPILOT INSTRUMENT KIT

NOTICE

This publication replaces Service Instruction BHT-412-SI-45dated 10 January 1994 in its entirety.

KIT NUMBER

EFFECTIVITY

MODEL

412EP

SERIAL NO.

412-706-116-127

41 2-706-1 16-131

36087 thru 36247

412EP 36248 and Subsequent

Belt HelicopterCOPYRIGHT NOTICE

COPYRIGHT2000

BELL HELICOPTER TEXTRON INC.AND BELL HELICOPTER TEXTRON INC.A DIVISION OF TEXTRON CANADA LTD.

ALL RIGHTS RESERVED

A Subsidiary of Textron Inc.

POST OFFICE BOX 482 FORT WORTH, TEXAS 76101

REISSUE - 14 NOVEMBER 2000

BHT-412-SI-45

PROPRIETARY RIGHTS NOTICEThese data are proprietary to Bell Helicopter Textron Inc. Disclosure,reproduction, or use of these data for any purpose other than helicopteroperation and/or maintenance is forbidden without prior writtenauthorization from Bell Helicopter Textron Inc.

The user of this manual may make copies of text, illustrations and checklists as needed to directly assist in accomplishing helicopter maintenance.

Additional copies of this publication may be obtained by contacting:Commercial Publication Distribution Center

Bell Helicopter Textron Inc.P. 0. Box 482

Fort Worth, Texas 76101-0482

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LIST OF EFFECTIVE PAGES

Insert latest revision pages; dispose of superseded pages.

On a revised page the portion of the text and illustration affected by the latest technical revisionis indicated by a black vertical line. Revised pages without a black vertical line are a result oftext shift from page to page or nontechnical corrections.

Basic ......... 10 JAN 1994Reissue ..... 14 NOV 2000

Page Revision Page Revision Page RevisionNo. No. No. No. No. No.

Title ....................0P/N .....................0A/B .....................01-1/1-2 .................01-3 1-16 .............01-17/1-18 ...............02-1/2-2 .................02-3 - 2-8 ............03-1/3-2 .................03-3 - 3-8 ..............03-9/3-10 ................0

LIST OF CHAPTERS

Chapter Description Page1 INSTALLATION PROCEDURES ....................................... 1-12 OPERATION AND MAINTENANCE .................................... 2-13 PARTS INFORMATION AND KIT INVENTORY ........................ 3-1

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FAA ENGINEERING APPROVAL

Chapter 1 is approved by FAA Designated Engineering Representative(s) on Form 8110-3,Number 31713.

Kit No. 412-706-116-127 has been verified by engineering approval.

Kit No. 412-706-116-131 has been verified by engineering approval.

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E VALUATE

L OGISTICSP UBLICATIONS

Have you found something wrong with this manual - anerror, an inconsistency, unclear instructions, etc?Although we strive for accuracy and clarity, we maymake errors on occasion. If we do and you discover it,we would appreciate your telling us about it so that wecan change whatever is incorrect or unclear. Please beas specific as possible.

Your complaint or suggestion will be acknowledged andwe will tell you what we intend to do.

You may use the enclosed Customer Feedback form, asapplicable, to inform us where we have erred.

Your assistance is sincerely appreciated.

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CUSTOMER FEEDBACK

RETURN VIA FAX TO:PRODUCT SUPPORT ENGINEERING (450) 433-0272

MANUAL TITLE:

MANUAL NUMBER (If Assigned):DATE OF ISSUE:

DATE OF LAST REVISION:

SECTION, CHAPTER, PARAGRAPH AFFECTED:

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TAPE HERE

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IF MAILEDIN THE

UNITED STATES

FIRST CLASS PERMIT NO. 1744 FORT WORTH, TEXAS

Bell Helicopter I i : Lt] JA Subsidiary of Textron Inc.

Product Support EngineeringBell Helicopter Textron12800 Rue de I "AvenirMirabel, QuebecCanada, J7J 1R4

-----------------------------------------------------------------------

FOLD ON DOTTED LINES AND TAPE

TAPE HERE

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BHT-412-SI-45

CHAPTER 1 INSTALLATION PROCEDURES

TABLE OF CONTENTS

ParagraphNumber Title

PageNumber

1-1 General Information ............................................. 1-31-2 Preparation ...................................................... 1-31-3 Copilot Instrument Kit Installation ................................ 1-31-4 Copilot Instrument Panel Modification ......................... 1-61-5 Installation of Static Vents .................................... 1-91-6 Installation of Static Vent Tubing and Copilot Pitot Tube ...... 1-91-7 Installation of Copilot Rate Gyro .............................. 1-131-8 Overhead Console Modification (412-706-116-127) ........... 1-131-9 Overhead Console Modification (412-706-116-131) ........... 1-161-10 Return Helicopter to Flight Configuration ........................ 1-16

FIGURES

FigureNumber Title

PageNumber

1-1 Copilot Instrument Kit Installation ....................................... 1-41-2 Copilot Instrument Panel Modification .................................. 1-71-3 Copilot Pitot Static Tubing Schematic................................... 1-101-4 Installation of Static Vent Lines.......................................... 1-111-5 Rate Gyro Installation ................................................... 1-141-6 Overhead Cconsole Mmodification (412-706-116-127) .................. 1-151-7 Overhead Console Modification (412-706-116-131) ..................... 1-17/1-18

REISSUE -14 NOVEMBER 2000 1-1/1-2FOR BEST VALUE, BUY GENUINE BELL PARTS

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INSTALLATION PROCEDURES

1-1. GENERAL INFORMATION. 5. Do not clamp or string-tie wire bundlesuntil all kit wiring has been routed andconnected.

1. Existing equipment and/or componentsmay be removed to facilitate modification.Record the order of removal to facilitate andensure proper installation.

2. Tag all parts and attaching hardwareremoved (unless otherwise noted). Protect allparts and hardware retained for reuse fromdamage until reinstalled.

3. Following any drilling or cutting operation,remove burrs and metal particles. Wipe areausing MEK. Apply one thin coat of MIL-P-23377 primer to bare metal except when ahole is used for grounding.

4. Electrical bonding is required forindicators installed in the copilots instrumentpanel. Accomplish electrical bonding asfollows:

a. Prior to installing an indicator, preparemounting surfaces for Class RII electricalbond (BHT-ELEC-SPM).

b. With unit installed and electricalcable(s) disconnected, electrical resistancebetween ground and case of indicators (4, 15,16, and 18, Figure 1-2) shall not exceed 10milliohms.

C. With unit installed and electricalcable(s) connected, electrical resistancebetween ground and case of indicators (2, 14,and 17) shall not exceed 100 milliohms.

1-2. PREPARATION.

1. Open radio and battery compartment doorand disconnect battery.

2. Remove components as needed to gainaccess to work areas. Tag parts and retain forreinstallation.

1-3. COPILOT INSTRUMENT KITINSTALLATION.

NOTEThe 212-706-005 dual controls kitmust be installed prior to, orconcurrent with, installation of the412-706-116 copilot instrument kit.

For 212-706-005 dual controls kitinstallation, refer to BHT-412-SI-13.

Instrument wiring is part of basic helicopter.System connectors are stowed behindinstrument panel. Loosely install componentsuntil after wiring is terminated and connected.

Figure 1-1 identifies areas of the helicopter tobe modified during installation of copilotinstrument kit.

REISSUE -14 NOVEMBER 2000 1-3GENUINE BELL PARTS ARE YOUR BEST VALUE

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BHT-412-SI-45

SEE FIGURE _____1-6 OR 1-7

"A1.30 IN(33.02 mm)

1. Pitot tube (PH500)Screw (MS35207-226) 4 reqd

2. Cover (212-070-1051) refSupport (212-070-109-2)Screw (MS27039-1-06) 4 reqd NOTE

3. Sealant (299-947-107, Type III,Class 7) 1 Apply a light coat of sealant (3) between

4. Tube assembly (212-070-222-1) faying surfaces of nose skin and pilot tube5. Grommet (MS35489-6) support (2).6. Adapter (212-070-173-3)

Nut (50-012-06N400) 2 reqdInsert (50-012-01N404) 2 reqd

7. Tee (50-012-01N400)Insert (50-012-01N404) 2 reqdCap (50-012-02N400)

8. Cover (204-070-470-1)

4125145-1-1-1

Figure 1-1. Copilot Instrument Kit Installation (Sheet 1 of 2)

1-4 REISSUE -14 NOVEMBER 2000FOR BEST VALUE, BUY GENUINE BELL PARTS

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LEFT SIDE

UP

9.10.11.

12.

13.

14.

15.

16.

VIEW A -A(TYP 2 PLACES)

Existing washer and nutSpacer (NAS43DD3-8)Existing screw (ref)Screw (MS27039-1-10)Clamp (MS25281-F4)Baffle (412-030-210-101)Rivet (MS20470AD3-4) 2 reqdStatic vent (204-070-1271)Rivet (M5200426AD3-4) 6 reqdClamp (MS25281-F4)Screw (MS27039-1-08)Washer (AN960PD10L)Nut (M521042L3)Union (AN815-4D)Packing (MS28778-4)Bracket (AN74312)Screw (MS27039-1-08)Washer (AN960JD10L)Nut (MS21042L3)

CFS

24.44 FWD

VIEW B-BLEFT SIDE LOOKING INBOARD

STATIC VENTS(TYP 2 PLACES)

0.86 IN FOR RIGHT SIDE(21.84 mm)0.55 IN FOR LEFT SIDE(13.97 mm)

0.55 IN FOR RIGHT SIDE(13.97 mm)0.86 IN FOR LEFT SIDE(21.84 mm)

VIEW C-CLEFT SIDE LOOKING AFT

BRACKET (2 PLACES)

NOTES

1. Quantities shown are for oneside only.

2 Layout and drill a No. 10 hole forbracket (16), left and right sides.

41251-45-1-1-2

Figure 1-1. Copilot Instrument Kit Installation (Sheet 2)

REISSUE -14 NOVEMBER 2000 1-5BUY BELL PARTS - BUY BELL VALUE

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1-4. COPILOT INSTRUMENT PANELMODIFICATION.

13. Install DCPL FT OFF annunciator (13).

1. Install cover (25, Figure 1-2) using twoscrews, washers, and nuts (25).2. Restow clock connector using existinghardware.

3. Install cover (1) using two screws,washers, and nuts (1).

NOTERemove and discard stowinghardware for electrical connectors.Install connectors on instruments asnoted.

4. Install 5M1 P1 on airspeed indicator (2).Install airspeed indicator (2) using four screwsand nuts (2). Refer to General Information forelectrical bonding requirement.

5. Install CYC CTR decal (3) adjacent tocaution light (5).6. Install 5M9P1 on attitude indicator (4).Install attitude indicator using four screws (4).Refer to General Information for electricalbonding requirement.

7. Install 8DS7P1 on RPM cautionannunciator (6). Install RPM cautionannunciator (6).8. Install 8DS5P1 on MASTER CAUTIONindicator (7). Install MASTER CAUTIONindicator using two screws (7).9. Install 8D545P1 on OVER TORQUEannunciator (8).10. Install OVER TORQUE annunciator (8).11. Install 5M3P1 on altimeter (14). Installaltimeter using three screws and nuts (14).Refer to General Information for electricalbonding requirement.

12. Install two covers (12) using two screwsand nuts (12). Sandwich instrument panelbetween covers (12).

14. Install 5M7P1, 5M7P2, and 5M7P3 ontachometer indicator (15). Install tachometerindicator using four screws and nuts (15).Refer to General Information for electricalbonding requirement.

15. Install 5M8P1, 5M8P2, and 5M8P3 ontorque indicator (16). Install torque indicatorusing four screws and nuts (16). Refer toGeneral Information for electrical bondingrequirement.

16. Install 5M4P1 on vertical speed indicator(17). Install vertical speed indicator usingthree screws and nuts (17). Refer to GeneralInformation for electrical bonding requirement.

17. Install 3405D52P1 connector onhorizontal situation indicator (18). Installhorizontal situation indicator using fourscrews (18). Refer to General Information forelectrical bonding requirement.

18. Install cover (19) using two screws,washers, and nuts (19).

19. Install cover (20) using four screws,washers, and nuts (20).

20. Install cover (21) using four screws,washers, and nuts (21).

21. Install decal (23) to existing resistor andknob.

NOTE

If installing 412-706-116-127 kit,perform steps 22 and 23. If installing412-706-116-131 kit, omit steps 22and 23.

22. Install switch (24). Connect stowed wiresF233B22 to terminal 1 and 234A22N toterminal 2 of switch (24) using solder andinsul tubing (24).

23. Install VG FAST ERECT decal (22).1-6 REISSUE - 14 NOVEMBER 2000

GENUINE BELL PARTS ARE YOUR BEST VALUE

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DOCOPILOT INSTRUMENT PANEL

LOOKING FORWARD

412SI45-1-2-1

Figure 1-2. Copilot Instrument Panel Modification (Sheet 1 of 2)

REISSUE -14 NOVEMBER 2000 1-7FOR BEST VALUE, BUY GENUINE BELL PARTS

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1. Cover (412-075-210-127)Screw (MS35214-26) 2 reqdWasher (AN960JD6L) 2 reqd

indicator (412-075-010-109)Screw (M535214-30) 4 reqdNut (MS33737-16) 4 reqd

Nut (MS21042L06) 2 reqd 16. Triple torque indicator (412-375-007-107)2. Airspeed indicator (412-075-009-105) Screw (M535214-30) 4 reqd

Screw (M535214-31) 4 reqd Nut (M533737-16 ) 4 reqdNut (MS33737-16) 4 reqd 17. Vertical speed indicator (212-070-239-1)

3. Decal (31-026-1075E12) Screw (M535214-31) 3 reqdCYC CTR (Cyclic Center) Nut (M533737-16) 3 reqd

4. Attitude indicator (111303-4)Screw (M535215-57) 4 reqd

situation indicator (111302-5)Screw (M535215-57) 4 reqd

5. Caution light (412-075-063) ref 19. (412-075-210-123)6. RPM annunciator (95-40-17-H6-56909) Screw (MS35214-26) 2 reqd7. MASTER CAUTION indicator Washer (AN960JD6L) 2 reqd

(209-075-325-9) Nut (MS21042L06) 2 reqdScrew (M535214-26) 2 reqd 20. Cover (412-075-210-115)

8. Annunciator (95-45-11-H6-56910)OVER TORQUE

(M535214-26) 4 reqdWasher (AN960JDL) 4 reqd

9. Decal (31-042-96TGJ) Nut (MS21042L06) 4 reqdOVER TORQUE 21. Cover (412-075-210-117)

10. Adhesive (299-947-152, Type II) Screw (M535214-26) 4 reqd11. Decal (31-042-942TGJ) Washer (AN960JDL) 4 reqd

PRESS TO TEST Nut (M521042L06) 4 reqd12. Cover (412-075-210-113) 2 reqd 1 22. (31-026-350E12)

Screw (M535214-27) 2 reqd VG FAST ERECTWasher (AN960JD6L) 2 reqd 23. Decal (412-075-223-101)Nut (MS21042L06) 2 reqd) 1\24. Switch (MS25089-1C)

13. Annunciator (95-40-17-B6-56885)DCPL F.T. OFF

(SN60)Insul tubing (85T-6-2)

14. Altimeter (212-070-238-7)Screw MS35214-32) 3 reqdNut (MS33737-16) 3 reqd

(412-075-210-107)Screw (MS35214-26) 2 reqdWasher (AN960JD6L) 2 reqdNut (MS21042L06) 2 reqd

NOTE/;\ Restow clock connector. Use existing hardware.

2 With unit connected, electrical resistance between caseand ground shall not exceed 100 milliohms.

3 Sandwich instrument panel between covers.

4 Applies to 127 kit only.5 Use existing resistor and knob.6 With unit installed and electrical cable(s) disconnected

electrical resistance between case and ground shall notexceed 10 milliohms.

412S145-1-2-2

Figure 1-2. Copilot Instrument Panel Modification (Sheet 2)

1-8 REISSUE - 14 NOVEMBER 2000BUY BELL PARTS - BUY BELL VALUE

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1-5. INSTALLATION OF STATIC VENTS.

NOTEStatic vents for copilot instrumentswill be installed in existing holesthrough nose skin at FS 24.44 andWL 28.25 left side and WL 24.75right side.

1. Remove cover at FS 24.44 and WL 28.25left side nose skin.

13. Remove existing screw (5). Retainwasher and nut (7). Install screw (5), clamp(5), and spacer (6). Secure using washer andnut (7).

1-6. INSTALLATION OF STATIC VENTTUBING AND COPILOT PITOT TUBE.

NOTE

All pitot/static tubing and fittingsshall be installed free of water traps.

2. Slide static vent (13, Figure 1-1) intoexisting hole through nose skin. Mark locationof six rivet holes and remove static vent (13).3. Drill six #40 drill size rivet holes. Deburrholes.

4. Install static vent (13) using six rivets(13).5. Position baffle (12). Mark location of tworivet holes and remove baffle.

6. Drill two #40 drill size rivet holes. Deburrholes.

7. Install baffle (12) using two rivets (12).8. Repeat steps 2. through 7. for static ventand baffle at FS 24.44 and WL 24.75 rightside.

9. Install packing (15) on union (15). Installunion into inboard end of static vent (13) asshown in View C-C, left and right sides.

NOTELoosely install bracket (16) andclamp (14) for subsequent pitotstatic tubing installation.

10. Layout hole for bracket (16) perdimensions shown in View C-C, left and rightsides.

11. Drill one hole 0.193 to 0.198 inch (4.902to 5.029 mm), as marked, left and right sides.Deburr holes.

12. Install bracket (16) using screw, washer,and nut (16), left and right sides.

NOTERefer to Figure 1-3 for copilot pitotstatic tubing schematic.

1. Install tube assembly (17, Figure 1-4), teeand cap (16) on right outboard side of nose atFS 24.44 and WL 24.75.

2. Remove cap (18) and install tubeassembly (18) above tube installed in step 1.3. Install tube assembly (12), tee (13) andcap (13) on left outboard side of nose at FS24.44 and WL 28.25.

4. Remove cap (11) and install tubeassembly (11) above tube installed in step 3.5. Place packing (1) on reducer (1). Installreducer into vertical speed indicator (1) oncopilot instrument panel (6).6. Connect tube assembly (15) to reducer onvertical speed indicator (1).7. Connect other end of tube assembly (15)to one end of tee (4) with insert (4).8. Install elbow (2) and insert (2) intoaltimeter indicator (2).9. Connect tubing (3) to elbow on altimeterindicator (2).10. Connect other end of tubing (3) to centerfitting of tee (4) with insert (4).11. Install adapter (5) and insert (5) intoairspeed indicator (5) and secure using nut(5), two places.


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BHT-412-SI-45

ADAPTER

AIRSPEEDLEFT PITOT TUBE

(COPILOT)

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LOWER RIGHTn SIDE STATIC

PORT

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UPPER LEFTSIDESTATICPORT - -

LEFTn ROOF MOUNT

STATIC PORT

--

ALTIMETER

VERTICALSPEED

PITOT LINESTATIC LINE - - - -- --

Figure 1-3. Copilot Pitot Static Tubing Schematic

12. Connect tubing (7) to inboard adapter onairspeed indicator (5).13. Connect other end of tubing (7) to centerfitting of tee (8) using insert (8).14. Connect one end of tubing (14) to tee(4) using insert (4).15. Connect other end of tubing (14) to tee(8) using insert (s).16. Install tee (10) between tube assembly(11) and existing static tubing using inserts(10).17. Connect one end of tubing (9) to tee (8)using insert (8).18. Connect other end of tubing (9) to tee(10) using insert (10).19. Connect tubing (19) to outboard adapteron airspeed indicator (5).20. Secure tubing (19) to existing instrumentair tubing, below windshield, using two

clamps (20), screw (20), washer (20), and nut(20) as shown in Figure 1-4, Sheet 2.21. Remove and discard cover (2, Figure 1-1) and attaching hardware from left side noseskin where copilot pitot tube is to be installed.Clean all adhesive from mounting areaaround hole pattern on outer skin.

22. Apply a light coat of sealant (3) overcontact surfaces of nose skin and pitot tubesupport (2). Secure support to skin with fourscrews (2). Remove any excess sealant fromaround support.

23. Insert straight end of tube assembly (4)from inside helicopter nose compartmentthrough pitot tube support until the tubeprotrudes out two or three inches (50 or 75mm).24. Insert opposite end of tube assembly (4)with 90 degree angle inboard.

25. Position pitot tube (1) with side stenciled"TOP,, up, in front of pitot tube support (2).Connect tube assembly (4) to pitot tube (1).

1-10 REISSUE - 14 NOVEMBER 2000FOR BEST VALUE, BUY GENUINE BELL PARTS

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WL24.15(REF)

VIEW LOOKING AFTAT NOSE

1. Vertical speed indicator (ref) 9. (130-011-4N144)Packing (MS28118-6) 10. Tee (50-412-15N400)Reducer (AN919-6D) Insert (50-012-01N404) 3 reqd

2. Altimeter indicator (ref) 11.Elbow (50-012-13N402) Cap (50-012-02N400) (ref)Insert (50-012-01N404) Add:

3. Tubing (130-O11.4N32) Tube assembly (412-075-225-101)Ident tape (31-033-5) 12. Tube assembly (412-075.221-101)Ident tape (31-032-32) 13. Tee (MS21905D4)

4. Tee (50-012-15N400) Cap (MS21914-4D)Insert (50-012-01N404) 3 reqd 14. Tubing (130-011-4N24)

5. Airspeed indicator (ref) 15. assembly (212-010-223-1)Adapter (212-010-113-1) 2 reqd 16. Tee (MS21905D4)Nut (50-012-06N400) 2 reqd Cap (MS21914-4D)Insert (50-012-01N404) 2 reqd 11. Tube assembly (412-015.226-101)

6. Instrument panel (ref) 18.1. Tubing (130-011-4N50)

Ident tape (31-033.5)(50-012-02N400) (ref)

Add:Ident tape (31-032-32) Tube assembly (412-015.224-101)

8. Tee (50-012-15N400)Insert (50-012.01N404) 3 reqd NOTE

Li\ Cut existing nylon tubing to fit.

412SI45-1-4-1

Figure 1-4. Installation of Static Vent Lines (Sheet 1 of 2)


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19. Tubing (130-011-4N52) 23. (212-070.173-3)Ident tape (31-033-5) Nut (50-012-06N400) 2 reqd(dent tape (31-032-48) Insert (50-012-01N404) 2 reqd

20. Clamp (MS25281-F4) 2 regd 24. (130.011-4N16)Screw (MS27039-1-09)Washer (AN960PQ10L)

(dent tape (31-033-5)Ident tape (31-032.48)

Nut (MS21042L3) 25. Tube assembly (212.010-222-1)21. Tee 150-012-15N400) 26. t50-012.12N400}

Insert (50.012-01N404) 2 reqd Insert (50-012.01N404) 2 reqdCap (50-012-02N400)

22. Tubing (130-011-4N155)Ident tape (31-033-5)ident tape (31-032-48)

412SI45-1-4-2

Figure 1-4. Installation of Static Vent Lines (Sheet 2)

1-12 REISSUE -14 NOVEMBER 2000GENUINE BELL PARTS ARE YOUR BEST VALUE

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26. Insert pitot tube (1) with "TOP" up intopitot tube support (2).Secure with four screws(1).

(8) inside bracket assembly (1). Installexisting screws and washers (1) throughbracket assembly into existing inserts.

27. Install pitot tube cover assembly (8) overpitot tube (1) and tie in place.28. Install grommet (5) in hole in upperframe.

29. Install tube (4) through grommet (5).30. Secure pitot tube assembly two placesalong upper frame with existing cables byremoving existing screw (11) and installinglonger screw (11), clamp (11), and spacer(10).31. Connect elbow (26, Figure 1-4) to tubeassembly (25) using insert (26).32. Connect tube (24) to elbow (26) usinginsert (26).33. Connect adapter (23) to tubing (24)using insert (23) and nut (23).34. Connect tubing (22) to adapter (23)using insert (23) and nut (23).35. Connect tee (21) between tubing (22)and tubing (19) using two inserts (21). Installcap (21) on tee

1-7. INSTALLATION OF COPILOT RATEGYRO.

NOTEThis procedure applies to 412-706-116-127 kit only.

1. Locate and remove existing rate gyro (8,Figure 1-5) forward of FS 23 at BL 0.0 onnose electronic shelf. Disconnect existingconnector (9). Retain existing screws andwashers for reuse.

NOTERemove protective finish locally forgood electrical grounding.

2. Prepare mounting surfaces for electricalbonding (BHT-ELEC-SPM). Install rate gyro

3. Install existing connector (9) on rate gyro

4. Prepare mounting surfaces for electricalbonding (BHT-ELEC-SPM). Install rate gyro(5) on top of of bracket assembly (1) andsecure using screws and washers (7).5. Remove clamp (2) and hardware (3) fromexisting wiring (6). Connect stowed 5Z1 P1plug (4) to rate gyro (5). Route with existingwiring and reinstall clamp (2) using screw (3).6. Install decal (5) on adjacent structure, sothat, rate gyro identification may be madeafter being installed.

1-8. OVERHEAD CONSOLEMODIFICATION (412-706-116-127).1. Open overhead console panel to connectcircuit breaker wiring.

2. Connect stowed wire 2NAV-45F22 or1 NAV-48A22 to existing COPILOT HSI circuitbreaker (1, Figure 1-6).3. Connect stowed wires F139A22 andF139C22 to existing COPILOT ATTITUDEcircuit breaker (2).4. Connect stowed wire 1 NAy-i 03A20 or1 NAV-50A22 to existing COPILOT HSI circuitbreaker (3).5. Connect stowed wire 2 GYRO-3A20 or1 CPMS-8A22 to existing COPILOT GYROCOMPASS circuit breaker (4).6. Connect stowed wire Fl 14A20 to existingCOPILOT PITOT HEATER circuit breaker (5).7. Connect stowed wire F117A22 to existingCOPILOT TURN RATE circuit breaker (6).8. Connect stowed wire L54A22 to existingCOPILOT INSTR LIGHT circuit breaker (7).9. Verify wiring connections and closeoverhead console panel.

REISSUE -14 NOVEMBER 2000 1-13FOR BEST VALUE, BUY GENUINE BELL PARTS

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1. Bracket assembly (412-075-105-101)Existing screw (MS35206-231 ) 4 reqdExisting washer (AN960JD6L) 4 reqd

2. Existing clamp (reuse)3. Screw (MS27O39-iO7)

Existing hardware (remove)4. Stowed plug 5Z1 P1 (ref)

Q 5. Rate gyro (214-075-244-101)Decal (31-007-59)

6. Existing wiring (ref}7. Screw (MS27039-0811) 4 reqd

Washer (AN96OJD8L) 4 reqd8. Existing rate gyro (reuse)9. Connector

NOTE1 Rate gyro installation applies to -127 kit only.

412SI45-1-5

Figure 1-5. Rate Gyro Installation

1-14 REISSUE - 14 NOVEMBER 2000BUY BELL PARTS - BUY BELL VALUE

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NOTES

1, COPILOT HSI circuit breaker (ref)2. COPILOT ATTITUDE circuit breaker (ref)3. COPILOT HSI circuit breaker (ref)4. COPILOT GYRO COMPASS circuit breaker (ref)5. COPILOT PITOT HEATER circuit breaker (ref)6. COPILOT TURN RATE circuit breaker (ref)1. COPILOT INSTR LIGHT circuit breaker (ref)

/;\ Connect stowedor 1NAV-48A22.

2 Connect stowedand F139C22.

3 Connect stowedor 1NAV-50A22,

4 Connect stowedor 1CPMS-8A22.

5 Connect stowed

L;_ Connect stowed

Connect stowed

wire 2NAV-45F22

wires F139A22

wire 1NAV-103A20

wire 2 GYRO-3A20

wire F 114A20.

wire F 117A22.

wire L54A22,

412SI45-1-6

Figure 1-6. Overhead Cconsole Mmodification (412-706-116-127)


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1-9. OVERHEAD CONSOLEMODIFICATION (412-706-116-131).

6. Connect stowed wire Fl 14A20 to existingCOPILOT PITOT HEATER circuit breaker (5).

1. Open overhead console panel to connectcircuit breaker wiring.

2. Connect stowed wire F409A22 to existingATTD 26V N0.1 circuit breaker (1, Figure 1-7)3. Connect stowed wire 2NAV-45F22 or1 NAV-48A22 to existing COPILOT HSI circuitbreaker (2).4. Connect stowed wires F139A22 andF139C22 to existing COPILOT ATTITUDESYS circuit breaker (3).5. Connect stowed wire 1 NAy-i 03A20 or1 NAV-50A22 to existing COPILOT HSI circuitbreaker (4).

7. Connect stowed wire L54A22 to existingCOPILOT INSTR LIGHT circuit breaker (6).8. Verify wiring connections and closeoverhead console panel.

1-10. RETURN HELICOPTER TO FLIGHTCONFIGURATION.

1. Perform ground check of pitot staticsystem.

2. Reinstall components removed to gainaccess to work area.

3. Connect battery.


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NOTES

Li: Connect stowed1, ATTD 26V NO. 1 (ref)2. COPILOT HSI circuit breaker (ref)3. COPILOT ATTITUDE circuit breaker (ref)4. COPILOT HSI circuit breaker (ref)5. COPILOT PITOT HEATER circuit breaker (ref)6. COPILOT INSTR LIGHT circuit breaker (ref)

L2 Connect stowedor 1NAY-48A22.Connect stowedand F139C22.

L4::\ Connect stowedor 1NAV-50A22

L_: Connect stowed

L Conned stowed

wire F409A22

wire 2NAV-45F22

wires F139A22

wire 1NAV-103A20

wire F 114A20.

wire L54A22

412SI45-1-7

Figure 1-7. Overhead Console Modification (412-706-116-131)

REISSUE -14 NOVEMBER 2000 1-17/1-18BUY BELL PARTS - BUY BELL VALUE

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BHT-412-SI-45

CHAPTER 2 OPERATION AND MAINTENANCE

TABLE OF CONTENTS


PageNumber

2-1 Operation Procedures ........................................... 2-32-2 Weight and Balance ............................................. 2-32-3 Maintenance Instructions ........................................ 2-32-4 Instrument Inspection............................................. 2-32-5 Instrument Repair or Replacement .............................. 2-42-6 Instrument Installation ........................................... 2-42-7 Annual Inspection Pitot Static Systems .......................... 2-42-8 Operational Pitot Static System Leak Check .................... 2-42-9 Troubleshooting ................................................. 2-5

REISSUE -14 NOVEMBER 2000 2-1/2-2FOR BEST VALUE, BUY GENUINE BELL PARTS

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OPERATION AND MAINTENANCE

2-1. OPERATION PROCEDURES.

Refer to Model 412EP Flight Manual foroperating procedures.

2-2. WEIGHT AND BALANCE.

Compliance with this service instructionaffects the weight and balance as shown infollowing chart. Adjust ballast to return emptyCG within limits

LONGITUDINAL *LATERALHELICOPTER KIT NUMBER WEIGHT ARM MOMENT ARM MOMENT

412EP 412-706-116-127 19.9 12.8 255 -15 -299(9.0) (325) (29.3) (-381) (-34.3)

412EP 412-706-116-131 17.8 12.7 226 -17.8 -317(8.1) (323) (26.0) (-452) (-36.6)

* In lateral calculations, - is left, + is right.WEIGHT pounds (kilograms)ARM inches (millimeter)MOMENT inch-pounds ( kg x mm)100

2-3. MAINTENANCE INSTRUCTIONS.

CAUTION044$4444044444444

ENSURE ALL ELECTRICALPOWER IS OFF.

3. Protect connector with electrical tape.

4. Cap instrument openings and pitot statictubes.

5. Remove mounting screws and carefullyremove instrument from panel.

6. Clean instruments as follows:NOTE

All instruments except the attitudedirectional indicator (ADI) andhorizontal situation indicator (HSI)are back-mounted in instrumentpanel and are secured by screwsthrough mounting flange.

1. Gain access through upper nose accessdoor.

2. Disconnect electrical connector and/orpitot static tube from back of instrument.

a. Use a clean, soft, lint-free cloth for thepanel and the instrument cover glass.

b. Use a bristle brush to remove dirt fromelectrical connectors and a clean cloth toremove moisture.

2-4. INSTRUMENT INSPECTION.

1. Inspect for loose, missing or improperlyinstalled knobs or hardware.

2. Inspect for loose, cracked or broken coverglass and security of mounting.


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3. Inspect for legibility of range markings orfaulty decals.

a. Block off left side static vent usingplastic electrical tape.

2-5. INSTRUMENT REPAIR ORREPLACEMENT.

1. Tighten or repair loose or cracked controlknobs.

2. Replace illegible range markings or faultydecals.

3. If cover glass is loose, cracked or broken;replace instrument.

4. If instrument is inoperative, defective ordamaged: replace it.5. Repair beyond local capability must beconducted by an authorized repair station.

2-6. INSTRUMENT INSTALLATION.

1. Carefully position instrument in place onpanel.2. Install mounting screws.

2-7. ANNUAL INSPECTION PITOT STATICSYSTEMS.

1. Inspect pitot static system using suitabletest equipment.

2. Test pitot system as follows, if suitableequipment is not available:

a. Inspect pitot lines for leakage byslipping a rubber or plastic hose 0.75 inch(19.05 mm) diameter over pitot tube. Securehose using tape.

b. Roll the hose tightly to force air intopitot tube, until the airspeed indicator reads100 knots. Tape the rolled hose in place.

C. Observe the airspeed indicator for fiveminutes. Airspeed should not drop more thanfive knots in five minutes.

d. When inspection is completed; removehose from pitot tube.

3. Inspect static lines for leakage as follows:

b. Disconnect tube from right side staticvent. Slip plastic or rubber hose over end ofthe tube and secure in place using tape.

C. Disconnect tube from the altimeterindicator. Disconnect tube from the verticalspeed indicator. Cap the tubes.

d. Roll the hose tightly, previouslydisconnected from right side static vent (stepb.) Rolling this hose will force air into thestatic system. When the airspeed indicatorreads 100 knots, tape the hose in place.

e. Disconnect 130-011-4N50 and 130-011-4N52 tubes from the airspeed indicator.Connect the 130-011-4N52 tube to airspeedindicator where the 130-011-4N50 tube isnormally installed.

f. Observe the airspeed indicator for fiveminutes. Airspeed should not drop more thanfive knots in five minutes.

g. After inspection, remove the hose andconnect the tubes in proper place.

4. Inspect static port system as follows:

a. Inspect tubing for leaks and chafing.

b. Inspect fittings, connectors, andhardware for proper installation.

5. Repair or replace as follows:

a. Tighten or replace loose or defectivetubing, fittings, and hardware.

b. Replace defective static vent.

2-8. OPERATIONAL PITOT STATICSYSTEM LEAK CHECK.

NOTEWith instruments and relatedequipment connected to pitot andstatic pressure lines; the systemshall be leak checked as follows:


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1. Evacuate the static pressure system to analtimeter reading of 1000 feet (304.8 meters)above test point altitude.

2-9. TROUBLESHOOTING.

NOTE2. Without additional pumping for a period ofone minute the loss shall not exceed 100 feet(30.5 meters) on the altimeter reading.3. Apply pressure to the pitot pressure portuntil airspeed indicator reads 140 knots, thencut off the pressure.

4. After a period of five minutes, the leakageindicated by the airspeed indicator shall notexceed ten knots.

Necessary checks must beperformed to isolate the trouble.Appropriate circuit breakers shouldbe closed. If equipment replacementfails to correct fault, check wiring.Refer to Maintenance Manual, BHT-412-MM for wiring diagrams.

NOTEFD flag, vertical command bar,horizontal command bar, GS flag,and glideslope needle are not usedand are electrically biased out-of-view via COPILOT TURN - SLIP INDcircuit breaker.

Table 2-1. Troubleshooting 111303-4 Attitude Directional Indicator (ADI)INDICATION OF TROUBLE PROBABLE CAUSE CORRECTIVE ACTION

ATTD SYS circuit breaker will Defective circuit breaker. Replace circuit breaker.not reset.

Defective wiring between circuit Check continuity and repairbreakers and ADI or between wiring.circuit breaker and three-axisgyro.

Internal short in ADI or three- Replace defective unit.axis gyro.

TURN-SLIP IND circuit breaker Defective circuit breaker. Replace circuit breaker.will not reset.

Defective wiring between circuit Check continuity and repairbreaker and rate-of-turn gyro orwiring.between circuit breaker andADI.

Internal short in rate-of-turn Replace defective unit.gyro or ADI.

Attitude sphere inoperative. Defective wiring. Check connectors andcontinuity. Replace defectiveconnectors and repair wiring.

Defective ADI. Replace ADI.

Defective three-axis gyro. Replace gyro.REISSUE -14 NOVEMBER 2000 2-5

BUY BELL PARTS - BUY BELL VALUE

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Table 2-1. Troubleshooting 111303-4 Attitude Directional Indicator (ADI) (Copt)INDICATION OF TROUBLE PROBABLE CAUSE CORRECTIVE ACTION

Attitude sphere slow to erect Defective wiring. Check connectors andwhen rapid erect switch is continuity. Replace defectiveoperated. connectors and repair wiring.

Defective switch. Replace switch.

Defective three-axis gyro. Replace gyro.

Rate-of-turn inoperative. Defective wiring. Check connectors andcontinuity. Replace defectiveconnectors and repair wiring.


Defective rate-of-turn gyro. Replace gyro.

ATT warning flag remains in Defective wiring. Check connectors andview. continuity. Replace defective

connectors and repair wiring.


Defective three-axis gyro. Replace gyro.

RT warning flag remains in Defective wiring. Check connectors andview. continuity. Replace defective

connectors and repair wiring.


Defective turn rate gyro. Replace gyro.


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Table 2-2. Troubleshooting 111302-5 HSIINDICATION OF TROUBLE PROBABLE CAUSE CORRECTIVE ACTION

No illumination. Helicopter dimming circuit Check wiring and isolate fault.faulty.

Indicator lamps burned out. Replace HSI.

Power OFF flag does not Defective HSI. Replace HSI.disappear.

Defective directional gyro. Replace gyro.

Defective wiring. Repair wiring.

Azimuth dial on HSI does not Defective HSI. Replace HSI.move in both MAG and DGmode.

Defective wiring.

Repair wiring.

Defective three-axis platform. Replace platform.

Course deviation bar does not Defective VOR receiver. Replace receiver.center.


Defective HSI. Replace HSI.

Defective antenna. Replace antenna.

Improper deviation on deviation Defective HSI. Replace HSI.bar.

Course width not adjusted Make course width adjustmentproperly. for proper deviation.

Defective VOR receiver. Replace receiver.

Glideslope needle fails to Defective HSI. Replace HSI.operate.

Defective glideslope receiver. Replace receiver.


Azimuth dial drift and Defective compass transmitter. Replace transmitter.annunciator does not work.

Defective three-axis platform. Replace platform.REISSUE -14 NOVEMBER 2000 2-7

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Table 2-2. Troubleshooting 111302-5 HSI (Copt)INDICATION OF TROUBLE PROBABLE CAUSE

Defective wiring.

Azimuth dial moves but final Defective directional gyro.heading shown by compassmajor index is incorrect.

Defective HSI.

Defective or misalignedcompass transmitter.

System not synchronized but Defective directional gyro.may be synchronized withmanual SYN switch.

Azimuth dial does not return to Defective directional gyro.same indication withintolerance.

Defective HSI.

Defective power system.

Defective transmitter.

CORRECTIVE ACTION

Repair wiring.

Replace gyro.

Replace HSI.

Replace and/or swing compasstransmitter.

Replace gyro.

Replace gyro.

Replace HSI.

Repair wiring and/or replacedefective equipment.

Replace transmitter.

Bearing pointer No. 1 does not Selected radio or RMI adapter Replace radio or adapter.point to station when NAV 1 or is defective.NAV 2 is selected.

Defective CPLTs BRG PTRswitch.

Defective wiring.

Bearing pointer No. 1 does not Defective HSI.point to station when both NAV1 and NAV 2 are selected.

Defective BTR PTR switch.

Defective wiring.

Bearing pointer No. 2 does not Defective ADF receiver.point to station.

Replace switch.

Repair wiring.

Replace HSI.

Replace switch.

Repair wiring.

Replace receiver.

2-8 REISSUE -14 NOVEMBER 2000BUY BELL PARTS - BUY BELL VALUE

BHT-412-SI-45

CHAPTER 3 PARTS INFORMATION AND KIT INVENTORY

TABLE OF CONTENTS


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3-1 Parts Information ................................................ 3-33-2 Kit Inventory, 412-706-116-127 ............................... 3-33-3 Kit Inventory, 412-706-116-131 ............................... 3-7

REISSUE -14 NOVEMBER 2000 3-1/3-2GENUINE BELL PARTS ARE YOUR BEST VALUE

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PARTS INFORMATION AND KIT INVENTORY

3-1. PARTS INFORMATION. 3-2. KIT INVENTORY, 412-706-116-127.

Refer to Illustrated Parts Breakdown manualBHT-412-IPB.

NOTE

Part numbers in parenthesis ()arealternate/superceding part numbers.

QUANTITY PART NUMBER NOMENCLATURE1 412-706-116-127 Kit, Copilot Instrument

consisting of:2 204-070-127-001 Static Vent1 204-070-470-001 Cover Assembly1 209-075-325-009 Indicator, Master Caution1 212-070-109-002 Support Assembly2 212-070-173-001 Adapter1 212-070-173-003 Adapter1 212-070-222-001 Tube Assembly1 212-070-223-001 Tube Assembly1 212-070-238-007 Indicator, Altimeter1 212-070-239-001 Indicator, Vertical Speed1 214-075-244-001 Rate Gyro

(214-075-244-101)2 412-030-210-101 Baffle

1 412-075-009-105 Indicator, Airspeed1 412-075-010-109 Indicator, Tach

(412-075-010-111)1 412-075-105-101 Bracket Assembly1 412-075-210-107 Cover2 412-075-210-113 Cover1 412-075-210-115 Cover Assembly1 412-075-210-117 Cover Assembly1 412-075-210-123 Cover1 412-075-210-127 Cover


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412-706-116-127 (Cont)QUANTITY PART NUMBER NOMENCLATURE

1 412-075-223-101 Decal1 412-075-224-101 Tube Assembly1 412-075-225-101 Tube Assembly1 412-075-226-101 Tube Assembly1 412-075-227-101 Tube Assembly1 412-375-007-107 Indicator, Torque2 AN743-12 Bracket2 AN815-4D Union1 AN919-6D Reducer16 AN960JD6L Washer

(NAS1149DN616J)4 AN960JD8L Washer

(NAS1149DN816J)5 AN960JD10L Washer

(NAS1149D0332J)12 MS20426AD3-4 Rivet4 MS20470AD3-4 Rivet16 MS21042L06 Nut5 MS21042L3 Nut

(NAS679A3)2 MS21905D4 Tee2 MS21914-4D Cap1 MS25089-1 C Switch6 MS25281-F4 Clamp4 MS27039-0811 Screw4 MS27039-1-06 Screw1 MS27039-1-07 Screw4 MS27039-1-08 Screw1 MS27039-1-09 Screw2 MS27039-1-10 Screw2 MS28778-4 Packing1 MS28778-6 Packing


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18 MS33737-16 Nut4 MS35207-226 Screw14 MS35214-26 Screw2 MS35214-27 Screw8 MS35214-30 Screw7 MS35214-31 Screw3 MS35214-32 Screw8 MS35215-57 Screw1 MS35489-6 Grommet2 NAS43DD3-8 Spacer1 PH500 Pitot Tube

1 (2 ft.) SN60 Solder1 111302-5 Indicator, Horizontal Situation1 111303-4 Indicator, Attitude1 130-011-4N144 Tubing1 130-011-4N155 Tubing1 130-011-4N16 Insul Tubing1 130-011-4N24 Tubing2 130-011-4N32 Insul Tubing1 130-011-4N50 Insul Tubing1 130-011-4N52 Tubing1 31-007-59 Decal1 31-026-1075E12 Decal1 31-026-350E12 Decal1 31-032-32 Tape1 31-032-48 Tape1 31-033-5 Tape1 31-042-92TGJ Decal1 31-042-96TGJ Decal18 50-012-01 N404 Insert, Fitting

REISSUE -14 NOVEMBER 2000FOR BEST VALUE, BUY GENUINE BELL PARTS

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1 50-012-02N400 Cap4 50-012-06N400 Nut Assembly1 50-012-12N400 Elbow1 50-012-13N402 Elbow4 50-012-15N400 Union-Tee Assembly2 85T4-6-2 Insul Tubing1 95-40-17-B6-56885 Indicator1 95-40-17-H6-56909 Indicator1 95-45-11-H6-56910 Switch

1 (8 oz. kit) 299-947-107, TY III, CL 7 Adhesive1 (3 oz. kit) 299-947-152, TY II Adhesive

1 BHT-412-SI-45 Service Instruction

3-6 REISSUE -14 NOVEMBER 2000BUY BELL PARTS - BUY BELL VALUE

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3-3. KIT INVENTORY, 412-706-116-131.

QUANTITY PART NUMBER NOMENCLATURE1 412-706-116-131 Kit, Copilot Instrument;

consisting of:2 204-070-127-001 Static Vent1 204-070-470-001 Cover Assembly1 209-075-325-009 Indicator, Master Caution1 212-070-109-002 Support Assembly2 21 2-070-1 73-00 1 Adapter1 212-070-173-003 Adapter1 212-070-222-001 Tube Assembly1 212-070-223-001 Tube Assembly1 212-070-238-007 Indicator, Altimeter1 212-070-239-001 Indicator, Vertical Speed2 412-030-210-101 Baffle1 412-075-009-105 Indicator, Airspeed1 412-075-010-109 Indicator, Tach

(412-075-010-111)1 412-075-210-107 Cover2 412-075-210-113 Cover1 412-075-210-115 Cover Assembly1 412-075-210-117 Cover Assembly1 412-075-210-123 Cover1 412-075-210-127 Cover1 412-075-223-101 Decal1 412-075-224-101 Tube Assembly1 412-075-225-101 Tube Assembly1 412-075-226-101 Tube Assembly1 412-075-227-101 Tube Assembly1 412-375-007-107 Indicator, Torque2 AN743-12 Bracket2 AN815-4D Union

REISSUE -14 NOVEMBER 2000GENUINE BELL PARTS ARE YOUR BEST VALUE

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412-706-116-131 (Copt)QUANTITY PART NUMBER NOMENCLATURE

1 AN919-6D Reducer16 AN960JD6L Washer

(NAS1 1 49DN616J)5 AN960JD10L Washer

(NAS1149D0332J)12 MS20426AD3-4 Rivet4 MS20470AD3-4 Rivet16 MS21042L06 Nut

5 MS21042L3 Nut(NAS679A3)

2 MS21905D4 Tee2 MS21914-4D Cap6 MS25281-F4 Clamp4 MS27039-1-06 Screw4 MS27039-1-08 ScrewI MS27039-1-09 Screw2 MS27039-1-10 Screw2 MS28778-4 Packing1 MS28778-6 Packing18 MS33737-16 Nut4 MS35207-226 Screw14 MS35214-26 Screw2 MS35214-27 Screw8 MS35214-30 Screw7 MS35214-31 Screw3 MS35214-32 Screw8 MS35215-57 Screw1 MS35489-6 Grommet2 NAS43DD3-8 Spacer1 PH500 Pitot Tube

1 (2 ft.) SN60 Solder

3-8 REISSUE - 14 NOVEMBER 2000FOR BEST VALUE, BUY GENUINE BELL PARTS

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412-706-116-131 (Copt)QUANTITY PART NUMBER NOMENCLATURE

1 111302-5 Indicator, Horizontal Situation1 111303-4 Indicator, Attitude1 130-011-4N144 Tubing1 130-011-4N155 Tubing1 130-011-4N16 Insul Tubing1 130-011-4N24 Tubing2 130-011-4N32 Insul Tubing1 130-011-4N50 Insul Tubing1 130-011-4N52 Tubing1 31-026-1075E12 Decal1 31-032-32 Tape1 31-032-48 Tape1 31-033-5 Tape1 31-042-92TGJ Decal1 31-042-96TGJ Decal

18 50-012-01 N404 Insert, Fitting1 50-012-02N400 Cap4 50-012-06N400 Nut Assembly1 50-012-12N400 Elbow1 50-012-13N402 Elbow4 50-012-15N400 Union-Tee Assembly2 85T4-6-2 Insul Tubing1 95-40-17-B6-56885 Indicator1 95-40-17-H6-56909 Indicator1 95-45-11-H6-56910 Switch

1 (8 oz. kit) 299-947-107, TY III, CL 7 Adhesive1 (3 oz. kit) 299-947-152, TY II Adhesive, Silicone

1 BHT-412-SI-45 Service Instruction

REISSUE -14 NOVEMBER 2000BUY BELL PARTS - BUY BELL VALUE

CHAPTER 1 INSTALLATION PROCEDURES1-1. GENERAL INFORMATION.1-2. PREPARATION.1-3. COPILOT INSTRUMENT KIT INSTALLATION.1-4. COPILOT INSTRUMENT PANEL MODIFICATION.1-5. INSTALLATION OF STATIC VENTS.1-6. INSTALLATION OF STATIC VENT TUBING AND COPILOT PITOT TUBE.1-7. INSTALLATION OF COPILOT RATE GYRO.1-8. OVERHEAD CONSOLE MODIFICATION (412-706-116-127).1-9. OVERHEAD CONSOLE MODIFICATION (412-706-116-131).1-10. RETURN HELICOPTER TO FLIGHT CONFIGURATION.

CHAPTER 2 OPERATION AND MAINTENANCE2-1. OPERATION PROCEDURES.2-2. WEIGHT AND BALANCE.2-3. MAINTENANCE INSTRUCTIONS.2-4. INSTRUMENT INSPECTION.2-5. INSTRUMENT REPAIR OR REPLACEMENT.2-6. INSTRUMENT INSTALLATION.2-7. ANNUAL INSPECTION PITOT STATIC SYSTEMS.2-8. OPERATIONAL PITOT STATIC SYSTEM LEAK CHECK.2-9. TROUBLESHOOTING.

CHAPTER 3 PARTS INFORMATION AND KIT INVENTORY3-1. PARTS INFORMATION.3-2. KIT INVENTORY, 412-706-116-127.3-3. KIT INVENTORY, 412-706-116-131.

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