• TM 1-1520-237-23-1


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    • Abstract: TM 1-1520-237-23-1TECHNICAL MANUALAVIATION UNIT AND INTERMEDIATE MAINTENANCE FORARMY MODELS UH-60A, UH-60L,EH-60A, UH-60Q AND HH-60LHELICOPTERSCHAPTER 1GENERAL INFORMATIONEQUIPMENT DESCRIPTION AND DATA

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TM 1-1520-237-23-1
TECHNICAL MANUAL
AVIATION UNIT AND INTERMEDIATE MAINTENANCE FOR
ARMY MODELS UH-60A, UH-60L,
EH-60A, UH-60Q AND HH-60L
HELICOPTERS
CHAPTER 1
GENERAL INFORMATION
EQUIPMENT DESCRIPTION AND DATA
THEORY OF OPERATION
This manual dated 17 April 2006, supersedes TM 1-1520-237-23-1, TM 1-1520-237-23-2, TM 1-1520-237-23-3, TM 1-1520-237-23-4, TM 1-1520-237-
23-5, TM 1-1520-237-23-6, TM 1-1520-237-23-7, TM 1-1520-237-23-8, TM 1-1520-237-23-9, TM 1-1520-237-23-10-1, TM 1-1520-237-23-10-2, TM
1-1520-237-23-10-3 and TM 1-1520-237-23-11, dated 1 May 2003 including all changes.
This information is furnished upon the condition that it will not be released to another nation without the specific authority of the Department of the
Army of the United States, that it will be used for military purposes only, that individual or corporate rights originating in the information, whether
patented or not, will be respected, that the recipient will report promptly to the United States, any known or suspected compromise, and that the
information will be provided substantially the same degree of security afforded it by the Department of Defense of the United States. Also, regardless of
any other markings on the document, it will not be downgraded or declassified without written approval of the originating United States agency.
DISTRIBUTION STATEMENT D - Distribution authorized to the DOD and DOD contractors only due to Critical Technology effective as of 15 June
2003. Other requests must be referred to Commander, US Army Aviation and Missile Command, ATTN: SFAE-AV-UH/L, Redstone Arsenal, AL 35898-
5000.
WARNING - This document contains technical data whose export is restricted by the Arms Export Control Act (Title 22, U.S.C., Sec 2751, et. seq.) or
the Export Administration Act of 1979, as amended, Title 50, U.S.C., App. 2401 et. seq. Violations of these export laws are subject to severe criminal
penalties. Disseminate in accordance with provisions of DoD Directive 5230.25.
DESTRUCTION NOTICE - Destroy by any method that will prevent disclosure of contents or reconstruction of the document.
HEADQUARTERS, DEPARTMENT OF THE ARMY
17 April 2006
TM 1-1520-237-1
WARNING SUMMARY
Personnel performing operations, procedures, and practices which are included or implied in this technical manual shall
observe the following warnings. To disregard these warnings and precautionary information can cause serious injury,
death, or an aborted mission.
WARNING
FIRST AID - refer to FM 4-25-11.
AC POWER - before applying ac power to the helicopter, make sure that the area around the stabilator is clear of
personnel and equipment. Should the stabilator be in any position other than trailing edge fully down, it may reposition
automatically to fully down when ac power is applied.
CARBON MONOXIDE - during cold weather operations when preheating is necessary, all personnel shall become
acquainted with the various types of heaters and where they are to be used. Be careful of accumulations of carbon
monoxide and damage to heat-sensitive equipment.
CONSUMABLE MATERIALS - observe all cautions and warnings on the containers when using consumables. When
applicable wear necessary protective gear during handling and use. If a consumable is flammable or explosive, MAKE
SURE consumable and its vapors are kept away from heat, spark, and flame. MAKE SURE helicopter is properly
grounded and firefighting equipment is readily available for use.
SAFETY PINS - make sure all safety pins are installed in ejector racks prior to performing any maintenance. To
disregard this warning can cause serious injury, death, or an aborted mission.
ELECTRICAL GROUNDING OF THE HELICOPTER - army regulations require the grounding of the helicopter when
doing all fueling and defueling operations. Do not operate helicopter electrical switches, except those essential for servic-
ing during fueling and defueling. Do not smoke or use flame during fueling and defueling operations.
HIGH VOLTAGE - there are dangerous voltages in the helicopter. Use extreme care when working with equipment hav-
ing these voltages.
HYDRAULIC SYSTEMS - there are dangerous high hydraulic system pressures in the helicopter. Use extreme care
when working on systems having this pressure.
USE OF FIRE EXTINGUISHER - when fire extinguishers are used in a confined area, ventilate immediately. Serious
injury or death could result if the area is not ventilated or the user does not use a self-contained breathing device.
MAIN ROTOR PYLON SLIDING COVER - when opening and closing main pylon sliding cover, keep hands away
from sharp edges near track, mating end, and especially ventilation blower inlet hole.
TECHNICAL ACETONE - technical Acetone is flammable and toxic to eyes, skin, and respiratory tract. Wear protective
gloves and goggles/face shield. Avoid repeated or prolonged contact. Use only in well-ventilated areas (or use approved
respirator). Keep away from open flames, sparks, hot surfaces or other sources of ignition.
ALKALINE AQUEOUS CLEANER - alkaline cleaner is harmful to skin and eyes. Use adequate ventilation. Operators
should wear protective gloves, aprons, and goggles. Upon contact with cleaning compound, wash affected area for at least
20 minutes with clean water. Seek medical attention.
CLEANING COMPOUND SOLVENT - cleaning Compound Solvent is combustible and toxic to eyes, skin, and respira-
tory tract. Wear protective gloves and goggles/face shield. Avoid repeated or prolonged contact. Use only in well-
ventilated areas (or use approved respirator). Keep away from open flames or other sources of ignition.
ELECTRON - use electron in well ventilated area only. Avoid prolonged breathing of vapors. Avoid bodily contact. The
use of chemical gloves and chemical splash goggles are required. Do not use near heat, spark or flame. This solvent is
reactive with acids and oxidizers; do not mix or cross-apply with other chemicals. Organic vapor respirator with dust and
mist filter is recommended when solvent is spray applied. Keep containers closed between applications.
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TM 1-1520-237-1
Provide mechanical ventilation if used in confined spaces. Coordinate the use of this material with your supporting
industrial hygiene and safety offices. Ensure you read and understand the material safety data sheet (MSDS) for electron
prior to use.
ISOPROPYL ALCOHOL - isopropyl alcohol is a volatile and flammable liquid which must be kept away from flame
and other ignition sources. It must be used only in well ventilated area. Personnel must wear protective gloves and eye
protection. Excessive inhalation of vapors or contact with skin must be avoided. If contact occurs with eyes or skin, flush
area thoroughly with water. If ingestion occurs, induce vomiting and call a doctor. Remove to fresh air if overexposed to
vapor.
DS-108 - use in well ventilated area. Avoid breathing vapors. Organic vapor respirator with dust and mist filter is recom-
mended. May be harmful by inhalation, ingestion, or skin absorption. Avoid bodily contact. Chemical safety glasses/
goggles and chemical resistant gloves are required. Combustible, keep away from heat, spark, or flame. Vapors are
heavier than air and may travel over a distance to an ignition source and then flash back. Do not mix or cross apply with
other chemicals.
LOCKWIRE - in critical applications use lockwire instead of safety cable which is specifically prohibited from use in
critical applications. The use of safety cable is restricted in these specific applications with a warning.
PURPOSE OF A WARNING - alerts personal to operation, procedure, practice, etc., which if not strictly observed,
could result in personal injury or loss of life.
CAUTION
USING BATTERY POWER DURING MAINTENANCE - use battery power as little as possible when maintaining the
helicopter. If the battery charge gets too low the APU will not start when only the battery electrical power is available. To
prevent running down the battery:
Make sure BATT switch is ON when ac power (either external power applied, or APU or main generator operating) is
supplied to the helicopter. This allows the battery to charge if necessary.
Make sure BATT switch is OFF when ac power is not applied to the helicopter and the battery is not being used.
If a BATT LOW CHARGE caution indication is obtained while using battery power, immediately set BATT switch to
OFF.
COLD WEATHER - BATTERY MAINTENANCE - to prevent damage to the battery, refer to TM 11-6140-203-23.
ROTOR SYSTEM - Do not operate the rotor system while the main rotor pylon sliding cover is in the open position.
Main rotor blades could contact the main rotor pylon sliding cover. If rotor system operation is required when the main
rotor pylon sliding cover is open, remove main rotor pylon sliding cover.
ROTOR SERVO PISTON RODS - Damage to main rotor servo piston rods seal will occur if piston rods come in
contact with contaminates during maintenance procedures. Contaminated main rotor servo piston rods will cause seal
damage during use causing excessive leakage past seals. Cover up main rotor servos prior to maintenance work to keep
area clean.
SAFETY CABLE - extreme caution should be exercised when using safety cable on or around movable aircraft flight
controls components. It is critical that the ferrule does not interfere with or wear against any movable flight control
component.
PURPOSE OF A CAUTION - alerts personnel to operation, procedure, practice, etc., which, if not strictly observed,
could result in damage to or destruction of equipment.
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TM 1-1520-237-1
NOTE
The inspection requirements herein establish basic criteria for inspecting for damage, i.e. cracks, corrosion, etc. When an
inspection for cracks is called out, the inspection should be in compliance with procedures in TM 1-1520-265-23 series
(Nondestructive Inspection Procedures for H-60 Helicopters Series). If the procedures are not addressed in TM 1-1520-
265-23, then use procedures called out in TM 1-1500-335-23 (Nondestructive Inspection Methods)
PURPOSE OF A NOTE - applies to operation, procedure, condition, etc., which it is essential to highlight.
END OF WORK PACKAGE
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INSERT LATEST CHANGED PAGES/WORK PACKAGES. DESTROY SUPERSEDED DATA.
LIST OF EFFECTIVE PAGES/WORK PACKAGES
Dates of issue for original and changed pages / work packages are:
Original 0 17 April 2006
TOTAL NUMBER OF PAGES FOR FRONT AND REAR MATTER IS 104 AND TOTAL
NUMBER OF WORK PACKAGES IS 1805 CONSISTING OF THE FOLLOWING:
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TM 1-1520-237-23-1
HEADQUARTERS,
DEPARTMENT OF THE ARMY
WASHINGTON, D.C., 17 April 2006
AVIATION UNIT AND INTERMEDIATE MAINTENANCE FOR
Army Models UH-60A, UH-60L, EH-60A, UH-60Q, and HH-60L Helicopters
REPORTING ERRORS AND RECOMMENDING IMPROVEMENTS.
You can help improve this manual. If you find any mistakes or if you know of a way to improve the
procedures, please let us know. Mail your letter, DA Form 2028 (Recommended Changes to Publica-
tions and Blank Forms), located in the back of this manual direct to: Commander, US Army Aviation
and Missile Command, ATTN:AMSAM-MMC-MA-NP, Redstone Arsenal, AL 35898-5000. You may
also send your recommended changes via electronic mail or by fax. Our fax number is DSN 788-6546
or Commercial 256-842-6546. Our e-mail address is [email protected] A reply will be
furnished to you.
This manual dated 17 April 2006, supersedes TM 1-1520-237-23-1, TM 1-1520-237-23-2, TM 1-1520-237-23-3, TM 1-1520-237-23-4, TM 1-1520-237-
23-5, TM 1-1520-237-23-6, TM 1-1520-237-23-7, TM 1-1520-237-23-8, TM 1-1520-237-23-9, TM 1-1520-237-23-10-1, TM 1-1520-237-23-10-2, TM
1-1520-237-23-10-3 and TM 1-1520-237-23-11, dated 1 May 2003 including all changes.
DISTRIBUTION STATEMENT D - Distribution authorized to the DOD and DOD contractors only due to Critical
Technology effective as of 15 June 2003. Other requests must be referred to Commander, US Army Aviation and Missile
Command, ATTN: SFAE-AV-UH/L, Redstone Arsenal, AL 35898–5000.
WARNING - This document contains technical data whose export is restricted by the Arms Export Control Act (Title 22,
U.S.C., Sec 2751, et. seq.) or the Export Administration Act of 1979, as amended, Title 50, U.S.C., App. 2401 et. seq.
Violations of these export laws are subject to severe criminal penalties. Disseminate in accordance with provisions of
DoD Directive 5230.25.
DESTRUCTION NOTICE - Destroy by any method that will prevent disclosure of contents or reconstruction of the
document.
TABLE OF CONTENTS
WP Sequence No.
CHAPTER 1 - GENERAL INFORMATION, EQUIPMENT DESCRIPTION AND DATA, THEORY OF
OPERATION
General........................................................................................................................................................... 0001 00
Aircraft Description and Data....................................................................................................................... 0002 00
Airframe Description and Data..................................................................................................................... 0003 00
Landing Gear Description and Data ............................................................................................................. 0004 00
Powerplant Description and Data ................................................................................................................. 0005 00
Engine Control System Description and Data.............................................................................................. 0006 00
Engine Start and Ignition System Description and Data ............................................................................. 0007 00
Engine Speed Governing Systems Description and Data ............................................................................ 0008 00
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TM 1-1520-237-23-1
TABLE OF CONTENTS - CONTINUED
WP Sequence No.
Engine Indicating Systems Description and Data ........................................................................................ 0009 00
Engine Warning Systems Description and Data........................................................................................... 0010 00
Hover Infrared Suppression System (HIRSS) Description and Data .......................................................... 0011 00
Main Rotor System Description and Data.................................................................................................... 0012 00
Tail Rotor System Description and Data...................................................................................................... 0013 00
Transmission System Description and Data ................................................................................................. 0014 00
Main Transmission Lubrication System Description and Data ................................................................... 0015 00
Main Transmission Warning And Indicating System Description and Data............................................... 0016 00
Main Transmission and Gear Box Chip Detector System Description and Data....................................... 0017 00
Hydraulic Systems Description and Data..................................................................................................... 0018 00
Hydraulic Servos, Actuators, and Modules Description and Data .............................................................. 0019 00
Flight Instruments Description and Data...................................................................................................... 0020 00
Miscellaneous Instruments Description and Data ........................................................................................ 0021 00
Instrument Display System Description and Data ....................................................................................... 0022 00
Signal Data Converter Description and Data ............................................................................................... 0023 00
Central Display Unit Description and Data.................................................................................................. 0024 00
Pilot’s Display Unit Description and Data................................................................................................... 0025 00
Caution/Advisory Warning System Description and Data........................................................................... 0026 00
Multifunction Display/Caution Advisory Warning System Description and Data UH-60Q HH-60L ...... 0027 00
AC Electrical System Description and Data ................................................................................................ 0028 00
AC Electrical Primary System Description and Data .................................................................................. 0029 00
AC Electrical Auxiliary Power System Description and Data .................................................................... 0030 00
AC Electrical External Power System Description and Data...................................................................... 0031 00
DC Electrical System Description and Data ................................................................................................ 0032 00
DC Electrical Primary System Description and Data .................................................................................. 0033 00
DC Electrical Battery System Description and Data ................................................................................... 0034 00
Interior Lighting Description and Data ........................................................................................................ 0035 00
Exterior Lighting Description and Data ....................................................................................................... 0036 00
Fuel System Description and Data ............................................................................................................... 0037 00
Flight Control System Description and Data ............................................................................................... 0038 00
Windshield Anti-Ice System Description and Data...................................................................................... 0039 00
Windshield Wiper System Description and Data ......................................................................................... 0040 00
Fire Detection System Description and Data ............................................................................................... 0041 00
Fire Extinguishing System Description and Data ........................................................................................ 0042 00
Engine Anti-Ice Systems Description and Data ........................................................................................... 0043 00
Blade Deicing System Description and Data ............................................................................................... 0044 00
Cargo Hook System Description and Data .................................................................................................. 0045 00
Heating and Ventilation System Description and Data................................................................................ 0046 00
Environmental Control System (ECS) Description and Data EH60A ..................................................... 0047 00
Environmental Control System (ECS) Description and Data UH-60Q HH-60L ...................................... 0048 00
Rescue Hoist Description and Data .............................................................................................................. 0049 00
Auxiliary Power System Description and Data............................................................................................ 0050 00
Auxiliary Power Unit Description and Data ................................................................................................ 0051 00
Armament Description and Data .................................................................................................................. 0052 00
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TABLE OF CONTENTS - CONTINUED
WP Sequence No.
Aeromedical Evacuation Kit Description and Data ..................................................................................... 0053 00
Blackout Devices Kit Description and Data ................................................................................................ 0054 00
Winterization Kit Description and Data ....................................................................................................... 0055 00
ESSS External Stores Support System Description and Data ..................................................................... 0056 00
ESSS Range Extension System Description and Data ................................................................................ 0057 00
ESSS Jettison System Description and Data................................................................................................ 0058 00
Auxiliary Cabin Heater System Description and Data ................................................................................ 0059 00
Main And Tail Rotor Blade Erosion Protection Kit Description and Data................................................. 0060 00
Chaff Dispenser System and M130 Chaff/Flare Dispenser System Description and Data ........................ 0061 00
Main/Tail Landing Gear Skis Description and Data.................................................................................... 0062 00
FLIR System Description and Data UH-60Q HH-60L .............................................................................. 0063 00
Cockpit Emergency Equipment Description and Data ................................................................................ 0064 00
Cabin Emergency Equipment Description and Data.................................................................................... 0065 00
Cockpit Air Bag System Description and Data............................................................................................ 0066 00
Microclimate Cooling System and Mask Blower Wiring Assembly Description and Data....................... 0067 00
Ground Support Equipment Description and Data ...................................................................................... 0068 00
CHAPTER 2 - TROUBLESHOOTING PROCEDURES
Position Transmitter/Limit Switch Assembly (AVIM) ................................................................................. 0069 00
Parking Brake System ................................................................................................................................... 0070 00
Tail Wheel Lock System ............................................................................................................................... 0071 00
Engine And Engine Interface ........................................................................................................................ 0072 00
No. 1 Engine Instruments And Warning Lights System.............................................................................. 0073 00
No. 2 Engine Instruments And Warning Lights System.............................................................................. 0074 00
Engine Overspeed Protection System........................................................................................................... 0075 00
Engine Speed Trim System........................................................................................................................... 0076 00
Engine Chip Detector System....................................................................................................................... 0077 00
Engine Anti-ice System................................................................................................................................. 0078 00
Engine Start And Ignition System ................................................................................................................ 0079 00
Engine Controls Quadrant (AVIM)............................................................................................................... 0080 00
BIM® Indicators............................................................................................................................................ 0081 00
Main Rotor Blades (AVIM) .......................................................................................................................... 0082 00
Medium And High Frequency Vibrations .................................................................................................... 0083 00
Gust Lock System ......................................................................................................................................... 0084 00
Transmission Chip Detector, Instruments, And Oil Warning Systems........................................................ 0085 00
Hydraulic Systems......................................................................................................................................... 0086 00
Pitot-Static System ........................................................................................................................................ 0087 00
Pitot Heater .................................................................................................................................................... 0088 00
Instrument Display System ........................................................................................................................... 0089 00
Caution/Advisory Warning System............................................................................................................... 0090 00
Digital Clock.................................................................................................................................................. 0091 00
Central Display Unit (70450-01043-122) (AVIM)....................................................................................... 0092 00
Central Display Unit (70450-01043-125, 70450-21943-118, Or 70450-01916-105) (AVIM) ................... 0093 00
Pilots Display Unit (AVIM) .......................................................................................................................... 0094 00
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TM 1-1520-237-23-1
TABLE OF CONTENTS - CONTINUED
WP Sequence No.
Signal Data Converter (SDC) (70450-01043-112 Or 70450-01043-126) (AVIM) ..................................... 0095 00
Signal Data Converter (SDC) (70450-21943-110 Or 70450-01916-103) (AVIM) ..................................... 0096 00
Caution/Advisory Panel (AVIM) .................................................................................................................. 0097 00
Chip Detector Resistor Unit (AVIM)............................................................................................................ 0098 00
Miscellaneous Switch Panel (AVIM)............................................................................................................ 0099 00
MFD/Caution/Advisory Warning System UH-60Q HH-60L ..................................................................... 0100 00
CHAPTER 3 - TROUBLESHOOTING PROCEDURES
AC Electrical System .................................................................................................................................... 0101 00
DC Electrical System .................................................................................................................................... 0102 00
Mission Electrical Interface EH60A .......................................................................................................... 0103 00
System Circuit Breakers................................................................................................................................ 0104 00
Instrument Panel Lights ................................................................................................................................ 0105 00
Upper And Lower Console Lights................................................................................................................ 0106 00
Cabin Dome Lights ....................................................................................................................................... 0107 00
Cockpit Flood And Secondary Lights .......................................................................................................... 0108 00
Utility And Maintenance Lights.................................................................................................................... 0109 00
Instrument Panel And Consoles Indicator Lights Dimming ........................................................................ 0110 00
Formation Lights ........................................................................................................................................... 0111 00
Controllable Searchlight ................................................................................................................................ 0112 00
Position Lights............................................................................................................................................... 0113 00
Retractable Landing Light............................................................................................................................. 0114 00
Anti-collision Lights...................................................................................................................................... 0115 00
Cargo Hook Lights UH60A UH60L UH-60Q HH-60L ............................................................................... 0116 00
ECM Antenna Actuator Assembly EH60A ................................................................................................ 0117 00
Fuel Boost Pump Control Panel (AVIM) ..................................................................................................... 0118 00
ECM Antenna Actuator Assembly (AVIM) EH60A .................................................................................. 0119 00
Right Hand Relay Panel (AVIM).................................................................................................................. 0120 00
Left Hand Relay Panel (AVIM).................................................................................................................... 0121 00
AC Electrical System UH-60Q HH-60L .................................................................................................... 0122 00
DC Electrical System UH-60Q HH-60L .................................................................................................... 0123 00
Upper And Lower Console Lights UH-60Q HH-60L ................................................................................ 0124 00
Instrument Panel Lights UH-60Q HH-60L ................................................................................................. 0125 00
Instrument Panel And Consoles Indicator Lights Dimming UH-60Q HH-60L ........................................ 0126 00
Fuel Low Level Warning System ................................................................................................................. 0127 00
Submerged Fuel Boost Pump System .......................................................................................................... 0128 00
Fuel Prime Boost System.............................................................................................................................. 0129 00
Pressure Refuel/Defuel System..................................................................................................................... 0130 00
Fuel Quantity System Using Test Set TF-579 ............................................................................................. 0131 00
Fuel Quantity System Using Test Set PSD60-1AF...................................................................................... 0132 00
Fuel Quantity System Harness Adapter (AVIM).......................................................................................... 0133 00
Cyclic Stick Assembly .................................................................................................................................. 0134 00
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TM 1-1520-237-23-1
TABLE OF CONTENTS - CONTINUED
WP Se


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