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TECHNICAL MANUAL

AVIATION UNIT AND INTERMEDIATE MAINTENANCE INSTRUCTIONS ARMY MODEL UH-1H/V/EH-1H/X

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TECHNICAL MANUAL HEADQUARTERSDEPARTMENT OF THE ARMY

TM 55-1520-210-23-3 WASHINGTON, D.C., 30 September 1987

AVIATION AND INTERMEDIATEMAINTENANCE INSTRUCTIONS

ARMY MODEL UH-1HNIEH-1HIX HELICOPTER

REPORTING OF ERRORS

You can help improve this manual. If you find any mistakes or if you know of a way to improve the procedures, please letus know. Mail your letter, DA Form 2028 (Recommended Changes to Publications and Blank Forms), or DA Form 20282located in the back of this manual directly to: Commander, U.S. Army Aviation and Troop Command, ATTN: AMSATIMP,4300 Goodfellow Blvd., St. Louis, MO 631201798. A reply will be furnished to you. You may also submit yourrecommended changes by Email directly to . A reply will be furnished to you.DISTRIBUTION STATEMENT A: Approved for public release; distribution Is unlimited.

TABLE OF CONTENTS

Page

CHAPTER 1 INTRODUCTIONSection I Servicing................................................................................................................................ 1-1II Lubrication............................................................................................................................. 140III Handling, Jacking, Mooring, Hoisting, and Sling Loading ..................................................... 1-54IV Inspection Requirements ...................................................................................................... 146V Overhaul and Retirement Schedule ...................................................................................... 1-110VI Flight Safety Critical Aircraft Parts......................................................................................... 1-115

CHAPTER 2 AIRFRAMESection I Fuselage................................................................................................................................ 2-1

II Tailboom................................................................................................................................ 2-193

CHAPTER 3 ALIGHTING GEARSection I Landing Gear 3 1

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TABLE OF CONTENTS (Cont)

CHAPTER 5.S e c t i o n I .

I I .

I I I .I V.V.VI .

VII.VIII.I X.

CHAPTER 6.S e c t i o n I .

I I .I I I ,IV.V.VI .VII.

CHAPTER 7.S e c t i o n I .

Il .

CHAPTER 8.S e c t i o n I .

I I

ROTORSMain Rotor System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Main Rotor Hub. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Main Rotor Blades. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Main Rotor Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Tall Rotor System . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . .Tall Rotor Hub and Blade Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Tall Rotor Hub and Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Tall Rotor Blades. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Tracking Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DRIVE TRAIN SYSTEMMain Driveshaft. , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Clu t ch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Main Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . .Tall Rotor Driveshaft. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Page

5-1

5-165-38.1

5-54.455-1055-1075-1195-1325-138

intermediate Gearbox . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Tall Rotor Gearbox . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Oil Syst ems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

HYDRAULIC AND PNEUMATIC SYSTEMSHy dra ulic Syst em . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....Pneumatic System (Not Applicable). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

INSTRUMENT SYSTEMSInstrument Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Engine instruments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6-1

6-296-29

6-116.26-1386-1476-167

7-17-51

8-1

8-2

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TABLE OF CONTENTS (Cont)

CHAPTER 12Section I

IIIII

CHAPTER 13Section I

IIIII

CHAPTER 14Section I

II

CHAPTER 15

CHAPTER 16

CHAPTER 17

APPENDIX A

APPENDIX BSection I

IIIII

APPENDIX C

UTILITY SYSTEMS

Windshield Wiper System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-5Rear View Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-20

ENVIRONMENTAL CONTROL SYSTEMHeating System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13-1

Air Cooling System . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . .13-15Winterization Equipment.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-18

Personnel Rescue Hoist. . . . . . . . . . . . . . . . . . . . . . . . . . . .14-1Cargo Suspension Assembly. . . . . . . . . . . . . . . . . . . . . . . . . 14-76

(Not Applicable) . . . . . . . . . . . . . . .. . . . . . . . . . . . . .15-1

MISSION EQUIPMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..16-1

EMERGENCYEQUIPMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17-1

REFERENCE. . . . . . . . . . . . . . . . . . . . . . . . . . A-1

MAINTENANCE ALLOCATION CHARTThree Levels of Maintenance Concept. . . . . . . . . . . . . . . .B-1

Maintenance Allocation Chart . . . . . . . . . . . . . . . . . . B-6Tools and Test Equipment. . . . . . . . . . . . . . . .B-76

AIRCRAFT INVENTORY MASTER GUIDE . . . . . . . . . . . . . . . C-1

Fire Detector System . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-1

HOIST AND WINCHES

AUXILLIARY POWER PLANTS

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APPENDIX B

MAINTENANCE ALLOCATION CHART

SECTION I. THREE LEVELS OF MAINTENANCE CONCEPT

INTRODUCTION

B-1. MAINTENANCE ALLOCATIONCHART.

a. This Maintenance Allocation Chart (MAC)assigns maintenance functions in accordance withthe Three Levels of Maintenance concept for armyaircraft. These maintenance levels, Aviation UnitMaintenance (AVUM); Aviation IntermediateMaintenance (AVIM) and Depot Maintenance aredepicted on the MAC as:

AVUM which corresponds to the O Code in theRPSTL.

AVIM which corresponds to an F Code in the

RPSTL.DEPOT which corresponds to a D Code in the

RPSTL

conserve personnel and equipment resources andair mobility requirements.)

(a) Company Size Aviation Units: Performthose tasks which consist primarily of preventive

maintenance and maintenance repair andreplacement functions associated with sustaining ahigh level of aircraft operational readiness. Performmaintenance inspections and servicing to includepreflight, daily, intermediate, periodic and specialinspections as authorized by the MAC or higherheadquarters. Identify the cause ofequipment/system malfunctions using applicabletechnical manual troubleshooting instructions,

built-in-test equipment (BITE), installed aircraftinstruments, or easy to use/interpretdiagnostic/fault isolation devices (TMDE). Replaceworn or damaged modules/components which do

l d

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are normally small and have less than ten aircraftassigned. Maintenance tasks performed by theseunits will be those which can be accomplished bythe aircraft crew chief or assigned aircraftrepairman and will normally be limited topreventive maintenance, inspections, servicing,spot painting, stop drilling, application of nonstresspatches, minor adjustments, module/componentfault diagnosis and replacement of selectedmodules/components. Repair functions willnormally be accomplished by the supporting AVIMunit.

(2) Aviation Intermediate Maintenance(AVIM) provides mobile, responsive “One Stop”maintenance support. (Maintenance functionswhich are not conducive to sustaining air mobilitywill be assigned to depot maintenance). Performsall maintenance functions authorized to be done atAVUM. Repair of equipment for return to user willemphasize support or operational readinessrequirements. Authorized maintenance includesreplacement and repair of modules/componentsand end items which can be accomplishedefficiently with available skills, tools, andequipment. Established the Direct Exchange (DX)program for AVUM units by repairing selecteditems for return to stock when such repairs cannotbe accomplished at the AVUM level. Inspects,troubleshoots, tests, diagnoses, repairs, adjusts,calibrates, and aligns aircraft systemmodules/components. AVIM units will have thecapability to determine the serviceability ofspecified modules/components removed prior to

collection and classification services forserviceable/unserviceable material. Operates acannibalization activity in accordance with AR750-50. (The aircraft maintenance company withinthe maintenance battalion of a division willperform AVIM functions consistent with airmobility requirements and conservation ofpersonnel and equipment resources. Additionalintermediate maintenance support will be providedby the supporting nondivisional AVIM unit.)

B-2. USE OF THE MAINTENANCE ALLOCATION CHART.

a. The Maintenance Allocation chart assignsmaintenance functions to the lowest level ofmaintenance based on past experience and thefollowing consideration:

(1) Skills available.

(2) Time required.

(3) Tools and test equipment required and/oravailable.

b. Only the lowest level of maintenanceauthorized to perform a maintenance function isindicated.

c. A maintenance function assigned to amaintenance level will automatically be authorizedto be performed at any higher maintenance level.

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specifically authorized by the maintenance officer ofthe level of maintenance to which the function isassigned. The special tools, equipment, etc. requiredby the lower level of maintenance to perform thisfunction will be furnished by the maintenance level towhich the function is assigned. This transfer of amaintenance function to a lower maintenance leveldoes not relieve the higher maintenance level of theresponsibility of the function, The higher level ofmaintenance has the authority to determine:

(1) If the lower level is capable of performing the

work.

(2) If the lower level will require assistance ortechnical supervision and on-site inspection.

(3) If the authorization will begranted to perform maintenance.

g. Organizational through depot maintenance ofthe U.S. Army Electronics Command equipment will

be performed by designated U.S. Army ElectronicsCommand personnel.

h. Changes to the Maintenance Allocation Chartwill be based on continuing evaluation and analysisby responsible technical personnel and on reportsreceived from field activities.

B-3. DEFINITIONS.

Maintenance functions. Maintenance functions willbe limited to and defined as follows:

a. Inspect. To determine the serviceability of ani b i i h i l h i l d/

d. Adjust. To maintain, within prescribed limits,by bringing into proper or exact position, or bysetting the operating characteristics to specifiedparameters.

e. Align. To adjust specified variable elementsof an item to bring about optimum or desiredperformance.

f. Calibrate. To determine and cause correctionsto be made or to be adjusted on instruments or testmeasuring and diagnostic equipments used in

precision measurement. Consists of comparisons oftwo instruments, one of which is a certified standardof known accuracy, to detect and adjust anydiscrepancy in the accuracy of the instrument beingcompared.

g. Install. The act of emplacing, seating, or fixinginto position an item, part, or module (componentor assembly) in a manner to allow the properfunctioning of an equipment or system.

h. Replace. The act of substituting a serviceablelike type part, subassembly, or module (componentor assembly) for an unserviceable counterpart.

i. Repair. The application of maintenanceservices or other maintenance action to restoreserviceability to an item by correcting specificdamage, fault, malfunction, or failure in a part,

subassembly, module (component or assembly),end item, or system.

j. Overhaul. That maintenance effort( )

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B-4. STANDARD GROUPS. groupings as individual chapters with sections inThe standard groupings shown below are used, as each chapter relative to the individual complete

applicable, throughout this MAC Maintenance systems, subsystems, modules, components,

manuals and RPSTLs reflect these standard assemblies, or specific parts noted. AIRFRAME ITEMS

GROUPNUMBER DESCRIPTION

00

01

02

03

04

Aircraft System

Aircraft General

Servicing, handling, inspectionrequirements, lubricationrequirements, overhaul andretirement requirements, cleaning,mooring, towing, jacking, hoisting,preservation requirements, weightand balance requirements, spotpainting, complete painting, andsubassembly painting requirements.

Airframe

Fuselage, empennage, pylons, wings,mounts (engine and transmission),armor, seats, ramps, decks, andtiedowns.

Alighting Gear

Landing gear, skids, floats, skis, struts,wheel brakes, and mechanicalmechanisms.

Power Plant Installation

GROUPNUMBER DESCRIPTION

06 Drive Train Systems

Transmissions, gearboxes, clutches,shafting, oil systems, bearings,hangers, oil tanks, and freewheelingunits.

07 Hydraulic and Pneumatic Systems

Pumps, filters, reservoirs, cylinders,valves, servos, motors, starters andaccumulators.

08 Instrument Systems

Flight instruments, navigationinstruments, engine instruments,miscellaneous instruments (i. e.,clocks), sending units, panels, andflow meters.

09 Electrical Systems

Motors, actuators, regulators,generators, starters, bat teries ,lighting, caution and warning lights,inverters, fault isolation systems, rotor

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GROUPNUMBER DESCRIPTION

12 Utility System.

Fire detecting/extinguishing systems,oxygen systems, windshield wipersystems, mirrors, and de-ice/anti-icesystems.

13 Environmental Control Systems (ECS)

Heaters, air conditioners, defrosters,control mixing valves, and ducts.

14 Hoists and Winches

Cargo/rescue hoists, winches, hooks,slings, loading systems, andemergency release systems.

15 Auxiliary Power Plants (APP)

Fuel, exhaust, and ducting.

B-5. SYMBOLS.

The letters “AVUM, AVIM AND DEPOT” as placedon the Maintenance Allocation Chart indicate thele el of Maintenance responsible for performing the

GROUPNUMBER DESCRIPTION

16 Mission Equipment

Spraying equipment, stores, racks,armament, reconnaissance, photo-graphy,pods, and litters.

17 Emergency Equipment

Ejection seats, canopies, jettisonsystem, portable fire extinguishers,axes, and first aid kits.

Installed Avionics Components

18 Communications and NavigationalBlack Boxes.

B-7. TOOLS AND TEST EQUIPMENT/(SECTION III).

Special tools, test, and support equipment required tod i t f ti li t d ith f

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SECTION II. MAINTENANCE ALLOCATION CHART MAINTENANCE ALLOCATION CHART

NOMENCLATURE OF END ITEMS

HELICOPTER UTILITY – TACTICAL TRANSPORT UH-1H/UH-1V/EH-1H(1) (2) (3) (4) (5) (6)

GROUP MAINTENANCE CATEGORY TOOLSMAINTENANCE AND

NUMBER COMPONENT/ASSEMBLY FUNCTION AVUM AVIM DEPOT EQUIPMENT REMARKS

NOTE

The extent of maintenance to be performed by AVUM as indicated in this MAC is governed by the size of theUnit and the T OOl S authorized (Refer to paragraph B-1 b(1) a. and b.). Specific notes are given to furtherIdentify or describe the extent or limit of maintenance to be performed.

0100 Aircraft General

0101 Clean — —

0102 Moor— —

0103 Tow — — 100

0104, Jack — — 100,102

0105 Hoist — —

0106 Preservation — — 100,102

0107 Weight & Balance 102,118121

0108 Spot Paint — — 100

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Figure D-278. Part Number 206-072-221-3 LANYARDFabricate from: NSN 4010-00-075-7941Material:

T M 5 5 - 1 5 2 0 - 2 1 0 - 2 3 - 3

D-309

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T M 5 5 - 1 5 2 0 - 2 1 0 - 2 3 - 3

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T M 5 5 - 1 5 2 0 - 2 1 0 - 2 3 - 3

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D - 3 1 2

F i g

ur

e D - 2

8 1 .

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Figure D-283. Part NumberFabricate from:

Material:

205-072-039-1 DOOR, Assy OfNSN 9330-00-291-4800,NSN 5340-00-993-1461Plastic sheet Acrylic Transparent, Federal SpecificationMIL-P-5425 FINA, 0.187 Inch Thick, 4.2 Inch Wide, 14.4 Inch LongLeaf, Butt Hinge A1 A AL ALY 0.0531 Inch Wide Make FromMS20257HP2-130 (Length 13.0)

D-314