Description
UH-60A UH-60L EH-60A HH-60A HH-60L Volume 4 Troubleshooting Manual TM 1-1520-237-23-4
This extensive Volume 4 technical manual contains aviation unit and intermediate maintenance troubleshooting procedures for Army model UH-60A, UH-60L, EH-60A, HH-60A and HH-60L helicopters. The 1425-page manual is centered on Chapter 4 troubleshooting and brings together operational checkout procedures, system fault isolation, electrical measurements, component checks, corrective-action paths, location drawings and detailed schematic diagrams for a broad range of aircraft utility and mission-equipment systems.
The UH-60A UH-60L EH-60A HH-60A HH-60L Volume 4 Troubleshooting Manual TM 1-1520-237-23-4 is structured around individual work packages. Procedures typically begin with the required test equipment, tools, personnel, references and aircraft conditions, then move into step-by-step operational checks. Expected indications are paired with corrective actions so technicians can follow a symptom from an initial system test through voltage, resistance or continuity checks and onward to the affected component or wiring path.
File Details
- Manual type: Aviation Unit and Intermediate Maintenance Manual – Volume 4 Troubleshooting Procedures
- Models: UH-60A, UH-60L, EH-60A, HH-60A, HH-60L
- Document number: TM 1-1520-237-23-4
- Language: English
- Page count: 1425 pages
- File format: PDF
- Cover revision: Change 3, 31 July 2012
- Internal updated pages: Includes later change material and AIRFRAME pages dated May 30, 2014
Chapter 4 – Aviation Unit and Intermediate Maintenance Troubleshooting Procedures
Volume 4 concentrates on troubleshooting aircraft systems rather than presenting a general operator overview. The table of contents identifies the following work-package subjects:
- Fire Detection System
- Fire Extinguishing System
- Windshield Wiper System
- Windshield Anti-Ice System
- Blade Deicing System
- Cargo Hook System – UH-60A, UH-60L, HH-60A, HH-60L
- Crewman’s Cargo Hook Pendant – UH-60A, UH-60L
- Blade De-ice Test Panel (AVIM)
- Heating and Ventilation System
- Environmental Control System (ECS) – EH-60A
- Environmental Control System (ECS) – HH-60A, HH-60L
- Rescue Hoist Kit
- Rescue Hoist System – HH-60A, HH-60L
- Rescue Hoist Control Panel (AVIM)
- Auxiliary Power Unit System – 116305 Series
- Auxiliary Power Unit System – 3800480 Series
- Aeromedical Evacuation Kit
- External Stores Support System (ESSS) Range Extension System – W/O MWO 50-78
- External Stores Support System (ESSS) External Tank Check – W/O MWO 50-78
- External Stores Support System (ESSS) Jettison System
- Auxiliary Cabin Heater
- Chaff Dispenser (M130) System – UH-60A, UH-60L, HH-60A, HH-60L
- Chaff/Flare Dispenser (XM130) System – EH-60A
- Air Transport Hydraulic Cart
- Auxiliary Cabin Heater (AVIM)
- Stores Jettison Control Panel (AVIM)
- External Stores Support System (ESSS) Range Extension System – HH-60A, HH-60L
- External Stores Support System (ESSS) Range Extension System – MWO 50-78
- Integrated Vehicle Health Management System (IVHMS) – UH-60A, UH-60L
- IVHMS Cockpit/Nose – UH-60A, UH-60L
- IVHMS Tail Pylon – UH-60A, UH-60L
- IVHMS Main Module – UH-60A, UH-60L
- IVHMS Tail Cone – UH-60A, UH-60L
- IVHMS Cabin – UH-60A, UH-60L
- Underwater Acoustic Beacon – UH-60A, UH-60L IVHMS configuration
- External Stores Support System External Tank Check – MWO 50-78
- Forward Looking Infrared (FLIR) – HH-60A, HH-60L
- Forward Looking Infrared (FLIR) – HH-60L
- Crashworthy External Fuel System Maintenance Operational Check
- Crashworthy External Fuel System Pressure Refueling Maintenance Operational Check
- Cockpit Air Bag System
- Microclimate Cooling Unit and Mask Blower Assemblies
- Common Missile Warning System (CMWS) and Improved Countermeasures Dispenser (ICMD)
Together, these sections provide a system-by-system troubleshooting reference spanning aircraft utility systems, environmental equipment, de-icing, external stores, rescue equipment, auxiliary power, health monitoring and selected mission systems. Because effectivity varies between UH-60A, UH-60L, EH-60A, HH-60A and HH-60L configurations, the work packages identify model-specific applicability where required.
Operational Checks and Fault Isolation
The manual uses detailed condition-and-indication logic to guide diagnosis. The fire detection section, for example, includes quick and detailed operational checks, circuit-breaker configuration, detector testing, voltage measurements and corrective actions for engine and APU fire-detection faults. It also contains component-location drawings and multi-sheet fire detection system schematics. The fire extinguishing work package similarly addresses main and reserve fire bottles, directional control operation, priority checks, squib wiring and electrical troubleshooting.
Windshield systems receive dedicated diagnostic coverage. The windshield wiper procedures check LOW, HI and PARK operation, proper sweep, blade effectiveness and wiper-arm tension, with troubleshooting for complete failure, single-wiper operation, speed-specific failures and park faults. The anti-ice work package uses controller, sensor, heater-element, 28 vdc and 115 vac checks together with temperature and resistance information. Operational checks specify windshield temperatures between 75°F (23.9°C) and 115°F (46.1°C), with separate procedures for pilot, copilot and applicable center windshield circuits.
Blade de-icing coverage is especially detailed. It includes icing-rate-meter checks, blade de-ice control and test panels, main and tail rotor circuits, warning indications, test sequencing, contactors, current transformers, wiring, rotor blade heater checks and diagnostic resistance measurements. The procedures distinguish helicopter configurations and provide dedicated schematic sheets to support electrical fault tracing.
Complete PDF Bookmark Tree
Complete Bookmarks
The complete bookmarks in the “UH-60A UH-60L EH-60A HH-60A HH-60L Volume 4 Troubleshooting Manual TM 1-1520-237-23-4” are as follows:
+Binder1p. 1
TM 1-1520-237-23-4 TROUBLESHOOTING PROCEDURES 1p. 1
TM 1-1520-237-23-4 TROUBLESHOOTING PROCEDURES 2p. 2
TM 1-1520-237-23-4 TROUBLESHOOTING PROCEDURES 3p. 3
TM 1-1520-237-23-4 TROUBLESHOOTING PROCEDURES 4p. 4
TM 1-1520-237-23-4 TROUBLESHOOTING PROCEDURES 5p. 5
TM 1-1520-237-23-4 TROUBLESHOOTING PROCEDURES 6p. 6
+Binder2p. 7
+wp0145p. 7
+tocp. 7
Fire Detection Systemp. 7
+Special Instructionsp. 7
Quick Check Operational/Troubleshooting Procedurep. 7
Detailed Check Operational/Troubleshooting Procedurep. 9
#1 ENG EMER OFF T-Handle Lights Are Onp. 16
#2 ENG EMER OFF T-Handle Lights Are Onp. 16
#1 ENG EMER OFF T-Handle Lights And Master Warning FIRE Capsulesp. 17
FIRE Capsule On One Master Warning Panel Does Not Go On During Fp. 18
#1 ENG EMER OFF T-Handle Lights And Master Warning FIRE Capsulesp. 19
#2 ENG EMER OFF T-Handle Lights And Master Warning FIRE Capsulesp. 20
#2 ENG EMER OFF T-Handle Lights Are Off And Master Warning FIREp. 22
APU T-Handle Lights And Master Warning FIRE Capsules Do Not Go Op. 22
T-Handles Remain Brightp. 24
Schematicsp. 29
+wp0146p. 34
+tocp. 34
Fire Extinguishing Systemp. 34
+Special Instructionsp. 34
Setup Operational/Troubleshooting Procedurep. 35
No. 1 Main Fire Extinguishing Bottle Operational/Troubleshootingp. 36
No. 2 Main Fire Extinguishing Bottle Operational/Troubleshootingp. 39
No. 1 Reserve Fire Extinguishing Bottle Operational/Troubleshootp. 41
No. 2 Reserve Fire Extinguishing Bottle Operational/Troubleshootp. 43
Directional Control Valve Check Operational/Troubleshooting Procp. 46
Shutdown Operational/Troubleshooting Procedurep. 47
Multimeter Connected To No. 1 Main Fire Bottle Wiring Has No Volp. 47
Directional Control Valve Does Not Operate When NO. 1 MAIN Is Usp. 49
Multimeter Connected To No. 1 Main Fire Bottle Wiring Has No Volp. 50
Multimeter Has No Voltage Indication When Actuation Of Impact Swp. 51
Multimeter Connected To No. 2 Main Fire Bottle Wiring Has No Volp. 52
Multimeter Connected To No. 1 Reserve Fire Bottle Wiring Has Nop. 53
Multimeter Connected To No. 1 Reserve Fire Bottle Wiring Has Nop. 54
Multimeter Connected To No. 2 Reserve Fire Bottle Wiring Has Nop. 55
Directional Control Valve Does Not Operate When APU T-Handle Isp. 55
Schematicsp. 62
+tablesp. 34
Table 1.No. 1 Main Fire Extinguishing Bottle.p. 37
Table 2. No. 2 Main Fire Extinguishing Bottle.p. 40
Table 3.No. 1 Reserve Fire Extinguishing Bottle.p. 42
Table 4.No. 2 Reserve Fire Extinguishing Bottle.p. 44
+wp0147p. 70
+tocp. 70
+Windshield Wiper Systemp. 70
Windshield Wiper System Operational/Troubleshooting Procedurep. 70
Wipers Do Not Operatep. 71
Only One Wiper Operatesp. 72
Wipers Do Not Operate In LOWp. 73
Wipers Do Not Operate In HIp. 73
Wipers Do Not Return To Parkp. 74
Schematicsp. 77
+wp0148p. 78
+tocp. 78
+Windshield Anti-Ice Systemp. 78
Windshield Anti-Ice System Operational/Troubleshooting Procedurep. 78
Copilot's Windshield Does Not Heatp. 80
Copilot's Windshield Temperature Is Not Between 75°F (23.9°C) Anp. 82
Pilot's Windshield Does Not Heatp. 83
Pilot's Windshield Temperature Is Not Between 75°F (23.9°C) Andp. 85
Center Windshield Does Not Heatp. 86
Center Windshield Temperature Is Not Between 75°F (23.9°C) And 1p. 88
Schematicsp. 93
+wp0149p. 102
+tocp. 102
Blade de-icing Systemp. 102
+Special Instructionsp. 103
Blade de-icing System Operational/Troubleshooting Procedurep. 103
Icing Rate Meter FAIL Flag In View And Meter Needle Did Not Deflp. 116
ICE DETECTED Capsule Or Legend Does Not Go Onp. 117
Icing Rate Meter Needle Does Not Movep. 119
With Blade de-ice Control Panel Power Switch OFF, T/R DE-ICE FAIp. 120
PWR MAIN RTR Lamp Is Onp. 121
PWR TAIL RTR Lamp Is Onp. 122
PWR TAIL RTR Lamp Does Not Cycle On And Off And/Or PWR TAIL RTRp. 122
TEST IN PROGRESS Lamp Does Not Cycle On And Offp. 123
TEST IN PROGRESS LAMP Does Not Function As Specifiedp. 124
MR de-ice FAIL And M/R de-ice FAULT Capsules Or Legends Go Onp. 125
MR DE-ICE FAIL Capsule Or Legend Goes Onp. 131
TR DE-ICE FAIL Capsule Or Legend Goes Onp. 143
MR DE-ICE FAIL And T/R DE-ICE FAIL Capsules Or Legends Are Bothp. 151
MR DE-ICE FAULT Capsule Or Legend Goes Onp. 154
PWR MAIN RTR And PWR TAIL RTR Lamps Do Not Go Onp. 158
Droop Stop Cams Are Not Warm When POWER Switch Is In TESTp. 159
MR DE-ICE FAIL And T/R DE-ICE FAIL Capsules Or Legends Are Onp. 160
MR DE-ICE FAIL, T/R DE-ICE FAIL And/Or M/R DE-ICE FAULT Capsulesp. 161
MR DE-ICE FAIL, T/R DE-ICE FAIL And M/R DE-ICE FAULT Capsules Orp. 164
None Of The Capsules Or Legends Go Onp. 166
With Blade de-ice Power Switch ON, M/R DE-ICE FAIL, T/R DE-ICE Fp. 166
Schematicsp. 178
+wp0150p. 215
+tocp. 215
Cargo Hook System UH-60A UH-60L HH-60A HH-60L> .p. 215
+Special Instructionsp. 215
Setup Operational/Troubleshooting Procedurep. 215
Normal Release Operational/Troubleshooting Procedurep. 216
Emergency Release Operational/Troubleshooting Procedurep. 219
Shutdown Operational/Troubleshooting Procedurep. 221
HOOK ARMED Capsule Or Legend Does Not Go Onp. 222
Cargo Hook Does Not Openp. 223
Cargo Hook Opens But CARGO HOOK OPEN Capsule Or Legend Does Notp. 226
CARGO HOOK OPEN Capsule Or Legend Stays On After Load Is Releasep. 227
CARGO HOOK TEST Light Does Not Go On When Pressedp. 227
CARGO HOOK EMERG REL TEST LIGHT DOES NOT GO ON DURING OPEN OR SHp. 228
CARGO HOOK EMERG REL TEST LIGHT GOES ON WHEN EMER RLSE BUTTON ISp. 230
Schematicsp. 237
+wp0151p. 242
+tocp. 242
+Crewman's Cargo Hook Pendant UH60A UH60L>. .p. 242
Crewman's Cargo Hook Pendant Operational/Troubleshooting Procedup. 242
Schematicsp. 245
+wp0152p. 246
+tocp. 246
Blade De-ice Test Panel (AVIM)p. 246
+Special Instructionsp. 246
Setup Operational/Troubleshooting Procedurep. 246
OAT Resistance Operational/Troubleshooting Procedurep. 247
SYNC/EOT Operational/Troubleshooting Procedurep. 249
Tail Rotor Fail Operational/Troubleshooting Procedurep. 252
Main Rotor Fail Operational/Troubleshooting Procedurep. 256
Shutdown Operational/Troubleshooting Procedurep. 259
Voltage Output Measured Between Test Set TEST POINTS P And T Isp. 259
Open Circuit Does Not Exist Between Test Set TEST POINTS R And Sp. 260
Resistance Check For Less Than 0.5 Ohms Does Not Exist Between Tp. 262
Open Circuit Does Not Exist Between Test Set TEST POINTS R And Sp. 263
Test Panel PWR TAIL RTR Lamp Does Not Light When Test Set TAIL Rp. 264
Test Panel PWR TAIL RTR Lamp Does Not Light When Test Set TAIL Rp. 264
Test Panel PWR TAIL RTR Lamp Does Not Light When Test Set TAIL Rp. 265
Test Panel PWR TAIL RTR Lamp Does Not Light When Test Set CURRENp. 266
Schematicsp. 268
+tablesp. 246
Table 1.OAT Resistance.p. 247
Table 2.SYNC/EOT Continuity.p. 249
+wp0153p. 272
+tocp. 272
Heating and Ventilation Systemp. 272
+Special Instructionsp. 272
Mixing Valve 70309-02101-103 Operational/Troubleshooting Procedup. 272
Mixing Valve 70309-02113-101 Operational/Troubleshooting Procedup. 275
Ventilation Blower Does Not Operatep. 278
No Heated Air Coming Out Of Any Louversp. 280
Air Temperature Cannot Be Regulatedp. 283
No. 1 Engine TGT Does Not Increase When HEATER Switch Is Placedp. 284
No. 2 Engine TGT Does Not Increase When HEATER Switch Is Placedp. 285
No. 1 And No. 2 Engine TGTs Do Not Increase When HEATER Switch Ip. 286
Air Temperature Coming Out Of Louvers Does Not Change When ENG Ap. 286
Schematicsp. 291
+wp0154p. 297
+tocp. 297
+Environmental Control System (ECS) EH60A>. .p. 297
Environmental Control System (ECS) Operational/Troubleshooting Pp. 298
EVAPORATOR FAN DOES NOT OPERATE WITH AIR COND SWITCH AT COOL ANDp. 311
AIR DOES NOT FLOW FROM EVAPORATOR OUTLET DUCTp. 315
CABIN HEAT ON CAPSULE DOES NOT GO ON WITH HTR SWITCH AT ON AND Ap. 315
AMMETER INDICATES LESS THAN 7 AMPS THROUGH HEATER DEMISTERp. 316
CONDENSER BLOWER DOES NOT GO ON WITH AIR COND SWITCH AT COOLp. 317
AIR IS NOT COMING OUT OF CONDENSER EXHAUST DUCTp. 318
COMPRESSOR MOTOR DOES NOT OPERATE WITH AIR COND SWITCH AT COOLp. 319
AIR COND ON CAPSULE DOES NOT GO ONp. 320
AIR FROM EVAPORATION OUTLET DUCT DOES NOT TURN COOLp. 321
WINDSHIELD ANTI-ICE SYSTEM DOES NOT DISABLE ECSp. 321
COMPRESSOR DRAWS LESS THAN MINIMUM ALLOWABLE CURRENTp. 323
COMPRESSOR DRAWS MORE THAN MAXIMUM ALLOWABLE CURRENTp. 323
LOW PRESSURE DOES NOT INCREASEp. 323
ECS DOES NOT OPERATE WITH BOTH MAIN GENERATORS RUNNINGp. 324
Schematicsp. 331
+wp0155p. 344
+tocp. 344
+Environmental Control System (ECS) HH-60A HH-60L>. .p. 344
Environmental Control System (ECS) Operational/Troubleshooting Pp. 345
AC ON CAPSULE ON ECS CONTROL PANEL DOES NOT GO ONp. 352
ECS FAULT INDICATOR PANEL HEATER INDICATOR LIGHT IS ONp. 353
ECS FAULT INDICATOR PANEL EVAPORATOR FAN INDICATOR LIGHT IS ONp. 354
ECS FAULT INDICATOR PANEL CONDENSER FAN INDICATOR LIGHT IS ONp. 354
ECS FAULT INDICATOR PANEL COMPRESSOR INDICATOR LIGHT IS ONp. 355
EVAPORATOR BLOWER DOES NOT TURN ONp. 356
CONDENSER BLOWER DOES NOT TURN ONp. 358
COMPRESSOR MOTOR DOES NOT TURN ONp. 359
ECS INOPERABLEp. 362
AIR DOES NOT FLOW FROM ECS OUTLET DUCTp. 362
COOL AIR DOES NOT FLOW FROM ECS DUCTp. 363
EVAPORATOR BLOWER DOES NOT GO ON WITH ECS CONTROL MODE SELECT SWp. 363
HEAT ON CAPSULE ON ECS CONTROL PANEL DOES NOT GO ONp. 364
ECS HEATER INOPERABLEp. 364
Schematicsp. 374
+wp0156p. 390
+tocp. 390
Rescue Hoist Kitp. 390
+Special Instructionsp. 390
Cable Shear Operational/Troubleshooting Procedurep. 390
Rescue Hoist Operational/Troubleshooting Procedurep. 392
SQUIB IND Light Does Not Go On When Pressedp. 396
SQUIB IND Light Does Not Go On When SQUIB Switch Is Placed To Tep. 397
No Voltage To Cable Cutter When CABLE SHEAR Switch In FIREp. 397
Fan Does Not Operate And POWER ON Light Does Not Go Onp. 398
Fan Does Not Operate, But Blue POWER ON Light Goes Onp. 398
Rescue Hoist Boom Does Not Swing Outp. 399
Rescue Hoist Boom Does Not Swing Inp. 400
Rescue Hoist Cable Does Not Reel Outp. 401
Rescue Hoist Cable Does Not Reel Inp. 401
Schematicsp. 406
+wp0157p. 409
+tocp. 409
Rescue Hoist System HH-60A HH-60L>. .p. 409
+Special Instructionsp. 409
Cable Shear Operational/Troubleshooting Procedurep. 410
Rescue Hoist Assembly Operational/Troubleshooting Procedurep. 413
Dual-Mode Controllable Searchlight Operational/Troubleshooting Pp. 416
Test Lamp Does Not Go On When Crew's Hoist Control Panel CABLE Cp. 419
Test Lamp Does Not Go On When Pilot's Hoist Control Panel CABLEp. 420
SQUIB TEST Indicator Does Not Go On When Crew's Hoist Control Pap. 420
Rescue Hoist Fan Motor Does Not Go Onp. 422
Rescue Hoist Cable Does Not Reel Out With Rescue Hoist Pendant Tp. 423
Rescue Hoist Cable Reels In/Out Incorrectlyp. 424
Rescue Hoist Pendant CABLE-FEET Indicator Does Not Show Increasip. 425
Rescue Hoist Cable Does Not Reel In With Rescue Hoist Pendant Thp. 426
Hoist Cable Does Not Reel Out With Pilot's Hoist Control Panel Pp. 426
Rescue Hoist Cable Does Not Reel In With Pilot's Hoist Control Pp. 427
Dual-Mode Controllable Searchlight Does Not Extendp. 427
Dual-Mode Controllable Searchlight Does Not Turn Rightp. 429
Dual-Mode Controllable Searchlight Does Not Turn Leftp. 429
Dual-Mode Controllable Searchlight Does Not Retractp. 430
Dual-Mode Controllable Searchlight Does Not Go Onp. 430
Test Set IR LIGHT Does Not Go Onp. 431
Schematicsp. 435
+wp0158p. 439
+tocp. 439
Rescue Hoist Control Panel (AVIM)p. 439
+Special Instructionsp. 439
Visual Inspection Operational/Troubleshooting Procedurep. 439
Electrical Operational/Troubleshooting Procedurep. 439
Meter Does Not Indicate Continuity Between Pins L And Tp. 442
With SQUIB Switch In The TEST Position, SQUIB IND Light Does Notp. 442
Schematicsp. 445
+wp0159p. 447
+tocp. 447
Auxiliary Power Unit System (116305 Series)p. 447
Special Instructionsp. 447
+Applicable Configurationp. 448
APU System Operational/Troubleshooting Procedurep. 448
Electronic Sequence Unit (ESU)p. 459
Simulator Setup Operational/Troubleshooting Procedurep. 460
Hydraulic Start Valve Operational/Troubleshooting Procedurep. 461
Speed Sequence Operational/Troubleshooting Procedurep. 462
Underspeed Operational/Troubleshooting Procedurep. 466
Overspeed Operational/Troubleshooting Procedurep. 468
Low Oil Pressure Operational/Troubleshooting Procedurep. 469
High Oil Temperature Operational/Troubleshooting Procedurep. 472
Start Bypass Valve Operational/Troubleshooting Procedurep. 474
Overtemperature Operational/Troubleshooting Procedurep. 475
Open Thermocouple Operational/Troubleshooting Procedurep. 477
Shorted Thermocouple Operational/Troubleshooting Procedurep. 479
Disconnecting Simulator Operational/Troubleshooting Procedurep. 480
ESU BITE Indicators Do Not Cycle When BATT Switch Is Placed ONp. 481
Fuel Leaks From APU Combustor Drain Line With Prime Boost Pump Rp. 482
ESU BITE Indicators Show ● ∘ ● ∘ (Shorted Thermocouple)p. 482
ESU BITE Indicator Shows ∘ ● ● ∘ (Fail To Light) For Helicoptersp. 483
ESU BITE Indicator Shows ∘ ● ● ∘ (Shorted Oil Pressure Switch) Fp. 484
APU Motor Does Not Motor (No Rotation)p. 485
ESU BITE Indicator Shows ● ∘ ∘ ● (Fail To Start)p. 486
ESU BITE Indicator Shows ∘ ● ∘ ∘ (Loss Of Speed Data) For Helicop. 488
ESU BITE Indicator Shows ∘ ∘ ● ● (Overtemperature)p. 488
ESU BITE Indicator Shows ∘ ∘ ∘ ●(Low Oil Pressure)p. 489
ESU BITE Indicator Shows ● ● ∘ ∘ (Open Thermocouple)p. 489
ESU BITE Indicator Shows ∘ ∘ ● ∘ (External Short) After ∘ ● ● ●p. 490
ESU BITE Indicator Shows ∘ ∘ ● ∘ (External Short) After ∘ ∘ ● ●p. 491
ESU BITE Indicator Shows ∘ ∘ ● ∘ (External Short) After ∘ ∘ ∘ ∘p. 491
APU Motors But Shuts Down (APU ON Capsule Goes Off And APU FAILp. 492
ESU BITE Indicator Shows ∘ ● ∘ ● (Underspeed)p. 493
ESU BITE Indicator Shows ● ● ∘ ● (Overspeed)p. 494
ESU BITE Indicator Shows ∘ ∘ ● ● (Overtemperature)p. 495
ESU BITE Indicator Shows ∘ ∘ ∘ ● (Low Oil Pressure)p. 496
ESU BITE Indicator Shows ● ● ∘ ∘ (Open Thermocouple)p. 497
APU Operates, But APU ON Capsule Is Offp. 497
APU OIL TEMP HI Capsule Goes On, ESU BITE Indicator Shows● ● ● ∘p. 498
Fuel Leaks From Combustor Drain Line With APU Runningp. 498
BITE Indicators Do Not Cycle When APU CONTR Switch Placed ONp. 499
APU Does Not Shut Down When APU CONTR Switch Is Placed OFFp. 500
No Power At APU Start Valvep. 501
APU Stall When Either Engine START Button Is Pressed (A Poppingp. 502
Fault 1. DESU Failure (BITE CODE #9)p. 504
Fault 2. Shorted Oil Pressure Switch (BITE CODE #17)p. 504
Fault 3. T/C Shorted (BITE CODE #18 or 20)p. 505
Fault 4. Loss of Aircraft Power (BITE CODE # 23)p. 505
Fault 5. APU Main Fuel Valve Failure (BITE CODE #28)p. 506
Fault 6. Start Circuit Failure or Illogical Switch Inputs (BITEp. 506
Fault 7. Start Fuel/Exciter Failure (BITE CODE #31)p. 506
Fault 8. RTL/MALF/HOT/APU Start Switch Indicator Failure (BITEp. 506
Fault 9. Power On Reset (BITE CODE #1)p. 507
Fault 10. APU Failed to Rotate (BITE CODE #14)p. 507
Fault 11. APU Overspeed (BITE CODE #12)p. 507
Fault 12. APU Under Speed (BITE CODE #13)p. 508
Fault 13. Loss of Speed Data (BITE CODE #21)p. 508
Fault 14. APU Shuts Down During Start (BITE CODE #33)p. 508
Fault 15. APU Failed to Accelerate (Start Fuel) (BITE CODE #34)p. 509
Fault 16. APU Accelerated Failed to Start (Start and Main Fuel)p. 510
Fault 17. APU Accelerated and Dwells Before Shutdown (Failed top. 511
Fault 18. APU Over Temperature (BITE CODE #38)p. 511
Fault 19. APU Low Oil Pressure (BITE CODE #15)p. 512
Fault 20. APU High Oil Temperature (BITE CODE #16)p. 512
Fault 21. Event Counter Does Not Record Eventsp. 513
Fault 22. Hour Meter Does Not Record Timep. 513
Fault 23. APU Start Bypass Valve Failure (BITE CODE#29)p. 513
Schematicsp. 523
+tablesp. 447
Table 1.Oil Leakage Rates.p. 448
Table 2.Normal Start Sequence.p. 450
Table 3.Cross Reference Chart for 5 BITE DESU Indications.p. 452
+wp0160p. 538
+tocp. 538
Auxiliary Power Unit System (3800480 Series)p. 538
+Applicable Configurationp. 538
Auxiliary Power Unit System (3800480 Series) Operational/Troublep. 538
Loss Of DC Power (● ● ● ●)p. 545
ESU Failure (∘ ● ● ●)p. 545
A/C Start System Failure (● ∘ ● ●)p. 546
Overtemperature (∘ ∘ ● ●)p. 546
Overspeed (● ● ∘ ●)p. 547
Underspeed (∘ ● ∘ ●)p. 548
Fail To Start (● ∘ ∘ ●)p. 548
Low Oil Pressure (∘ ∘ ∘ ●)p. 550
Oil Pressure Switch Failed (● ● ● ∘)p. 552
Thermocouple Failed (∘ ● ● ∘ )p. 552
Monopole Failed (● ∘ ● ∘)p. 553
Ignition Unit Failed (∘ ∘ ● ∘)p. 555
Fuel Solenoid Failed (● ● ∘ ∘)p. 556
Hot Sensor Failed (∘ ● ∘ ∘)p. 557
Fuel Torque Motor Failed (● ∘ ∘ ∘)p. 559
No Data (∘ ∘ ∘ ∘)p. 560
APU ON Advisory Capsule Failurep. 561
APU FAIL Advisory Capsule Failurep. 561
APU ON Advisory Capsule Failurep. 562
APU FAIL Advisory Capsule Failurep. 563
APU OIL TEMP HI Advisory Capsule Failurep. 564
APU Does Not Shut Down When APU CONTR Switch Is In The OFF Positp. 564
Schematicsp. 573
+tablesp. 538
Table 1.BITE Indication Symptoms.p. 541
Table 2.Non-BITE Indication Symptoms.p. 541
Table 3.Normal Start Sequence.p. 543
+wp0161p. 579
+tocp. 579
+Aeromedical Evacuation Kitp. 579
Aeromedical Evacuation Kit Operational/Troubleshooting Procedurep. 579
ONE OF THE LITTER LIGHTS DOES NOT GO ONp. 583
NONE OF THE FOUR AFT LITTER LIGHTS GO ONp. 583
NONE OF THE FOUR FORWARD LITTER LIGHTS GO ONp. 583
Schematicsp. 587
+wp0162p. 589
+tocp. 589
External Stores Support System (ESSS) Range Extension System W/p. 589
+Applicable Configurationp. 589
External Stores Support System (ESSS) Range Extension System Opep. 590
WHEN CONTROL PANEL TEST BUTTON IS PRESSED, ALL CONTROL PANEL INDp. 611
DURING SELF-TEST, CONTROL PANEL DIGITAL DISPLAY INDICATES E02 INp. 612
DURING SELF-TEST, CONTROL PANEL DIGITAL DISPLAY INDICATES E03 INp. 613
CONTROL PANEL EMPTY INDICATOR IS ON WITH ADEQUATE FUEL IN FUEL Tp. 614
WHEN CONTROL PANEL STATUS BUTTON IS PRESSED, AND THEN RELEASED,p. 615
WITH WEIGHT-ON-WHEELS CONTROL PANEL CAL INDICATION CANNOT BE CHAp. 616
DIGITAL DISPLAY INDICATION CHANGES WITH DRAG BEAM SWITCH IN IN-Fp. 617
CDU TOTAL FUEL INDICATION INCREASES WHEN FUEL TRANSFER IS NOT ACp. 618
WITH MANUAL MODE SELECTED, CDU TOTAL FUEL INDICATION DOES NOT INp. 620
WITH MANUAL MODE SELECTED, CDU TOTAL FUEL INDICATION DOES NOT INp. 623
WITH MANUAL MODE SELECTED, CDU TOTAL FUEL INDICATION DOES NOT INp. 626
WITH MANUAL MODE SELECTED, CDU TOTAL FUEL INDICATION DOES NOT INp. 629
FUEL TRANSFER TIME AND/OR GAGING ACCURACY IS NOT AS SPECIFIEDp. 631
AUTO MODE FUEL TRANSFER LIMITS ARE NOT AS SPECIFIEDp. 632
CONTROL PANEL RIGHT NO FLOW INDICATOR REMAINS ON DURING FUEL TRAp. 633
CONTROL PANEL LEFT NO FLOW INDICATOR REMAINS ON DURING FUEL TRANp. 634
CONTROL PANEL EXTERNAL RIGHT INBD EMPTY AND/OR LEFT INBD EMPTY Ip. 635
CAUTION/ADVISORY PANEL AUX FUEL CAPSULE AND/OR CONTROL PANEL EXTp. 636
CONTROL PANEL EXTERNAL RIGHT OUTBD EMPTY AND/OR LEFT OUTBD EMPTYp. 637
VENT SENSOR FAIL INDICATOR DOES NOT GO ONp. 638
Schematicsp. 644
+wp0163p. 651
+tocp. 651
External Stores Support System (ESSS) External Tank Check W/O Mp. 651
Special Instructionsp. 651
+Applicable Configurationp. 651
Setup Operational/Troubleshooting Procedurep. 652
Outboard Tanks Installed Operational/Troubleshooting Procedurep. 654
Inboard Tanks Installed Operational/Troubleshooting Procedurep. 656
Shutdown Operational/Troubleshooting Procedurep. 657
END OF WORK PACKAGEp. 663
+wp0164p. 664
+tocp. 664
+External Stores Support System (ESSS) Jettison Systemp. 664
External Stores Support System (ESSS) Jettison System Operationap. 664
NONE OF THE TEST LIGHTS GO ON WHEN EMER JETT ALL SWITCH IS PLACEp. 678
EITHER OUTBOARD TEST LIGHT DOES NOT GO ON WHEN EMER JETT ALL SWIp. 679
NONE OF THE TEST LIGHTS GO ON WHEN SELECTOR SWITCH IS SET TO ALLp. 681
EITHER OUTBOARD TEST LIGHT DOES NOT GO ON WHEN SELECTOR SWITCH Ip. 681
W/O MWO 50-78>. . < RIGHT AND LEFT OUTBOARD TEST LIGHTS DO NOp. 682
MWO 50-78>. . < RIGHT AND LEFT OUTBOARD TEST LIGHTS DO NOT GOp. 683
W/O MWO 50-78>. . < RIGHT AND LEFT INBOARD TEST LIGHTS DO NOTp. 684
MWO 50-78>. . < RIGHT AND LEFT INBOARD TEST LIGHTS DO NOT GOp. 685
W/O MWO 50-78>. . < RIGHT AND LEFT OUTBOARD TEST LIGHTS DO NOp. 686
MWO 50-78>. . < RIGHT AND LEFT OUTBOARD TEST LIGHTS DO NOT GOp. 687
W/O MWO 50-78>. . < RIGHT AND LEFT INBOARD TEST LIGHTS DO NOTp. 688
MWO 50-78>. . < RIGHT AND LEFT INBOARD TEST LIGHTS DO NOT GOp. 689
MULTIMETER DOES NOT INDICATE LESS THAN10 MVDC AND 50 MVACp. 690
Schematicsp. 695
+wp0165p. 703
+tocp. 703
Auxiliary Cabin Heaterp. 703
+Special Instructionsp. 703
Using External Or APU Power Operational/Troubleshooting Procedurp. 703
Using Main Generator Power Operational/Troubleshooting Procedurep. 706
BLOWER DOES NOT RUN WITH OFF-ON-RESET SWITCH AT ONp. 709
HTR ON LIGHT DOES NOT GO ON WITH OFF-ON-RESET SWITCH AT RESETp. 711
HEATER DOES NOT GO ON WITH OFF-ON-RESET SWITCH AT ON (AFTER RESEp. 712
AUXILIARY CABIN HEATER CONTINUES TO OPERATE WHEN BACKUP HYDRAULIp. 716
AUXILIARY CABIN HEATER CONTINUES TO OPERATE WHEN GENERATORS NO.p. 717
AUXILIARY CABIN HEATER CONTINUES TO OPERATE WHEN GENERATORS NO.p. 717
Schematicsp. 724
+wp0166p. 730
+tocp. 730
+Chaff Dispenser (M130) System UH-60A UH-60L HH-60A HH-60L>. .p. 730
Chaff Dispenser (M130) System Operational/Troubleshooting Procedp. 730
ARM LIGHT DOES NOT GO ONp. 735
STRAY VOLTAGE LIGHT GOES ONp. 740
CHAFF COUNTER DOES NOT COUNT DOWNp. 740
STRAY VOLTAGE LIGHT GOES ONp. 742
Schematicsp. 747
Test Setupp. 750
+wp0167p. 751
+tocp. 751
Chaff/Flare Dispenser (XM130) System EH-60A>. .p. 751
+Special Instructionsp. 751
Helicopter/Dispenser System Interface Operational/Troubleshootinp. 752
Flare Dispenser System Operational/Troubleshooting Procedurep. 753
Chaff Dispenser System Operational/Troubleshooting Procedurep. 760
Shutdown Operational/Troubleshooting Procedurep. 762
ARM INDICATOR DOES NOT GO ONp. 763
FLARE COUNTER AND TEST SET DO NOT REGISTER SIMULATED FLARE LAUNCp. 764
FLARE COUNTER DOES NOT COUNT DOWN WHEN RIPPLE FIRE SWITCH IS INp. 765
CHAFF COUNTER AND TEST SET DO NOT REGISTER SIMULATED CHAFF LAUNCp. 765
CHAFF DISPENSER PROGRAM MODE OF OPERATION DOES NOT OPERATEp. 766
Schematicsp. 771
Test Setupp. 773
+wp0168p. 774
+tocp. 774
+Air Transport Hydraulic Cartp. 774
Air Transport Hydraulic Cart Operational/Troubleshooting Procedup. 774
Cart Motor Does Not Operate When START Button Is Pressedp. 779
Cart Motor Does Not Continue To Operate After START Button Is Rep. 782
Hose Does Not Pressurize When RIGHT Switch Placed UP (Motor RPMp. 783
Hose Does Not Pressurize When TAIL Switch Is Placed UP (Motor RPp. 784
Hose Does Not Pressurize When LEFT Switch Is Placed UP (Motor RPp. 785
Fluid Does Not Stop Flowing When RIGHT Switch Is Placed DOWNp. 786
Hose Does Not Pressurize When RIGHT Switch Is Placed DOWN (Motorp. 788
Fluid Does Not Stop Flowing When TAIL Switch Is Placed DOWNp. 789
Hose Does Not Depressurize When TAIL Switch Is Placed DOWN (Motop. 790
Fluid Does Not Stop Flowing When Left Switch Is Placed DOWNp. 791
Hose Does Not Depressurize When LEFT Switch Is Placed DOWN (Motop. 792
Schematicsp. 797
+wp0169p. 805
+tocp. 805
Auxiliary Cabin Heater (AVIM)p. 805
+Special Instructionsp. 805
Visual Inspection Operational/Troubleshooting Procedurep. 805
Ohms Operational/Troubleshooting Procedurep. 806
Schematicsp. 809
+wp0170p. 810
+tocp. 810
+Stores Jettison Control Panel (AVIM)p. 810
Stores Jettison Control Panel (AVIM) Operational/Troubleshootingp. 810
Multimeter Does Not Indicate 28 Vdc Between J1-A And J1-cp. 821
Multimeter Does Not Indicate 28 Vdc Between J1-L And J1-cp. 822
Multimeter Does Not Indicate 28 Vdc Between J1-N And J1-cp. 822
Multimeter Does Not Indicate 28 Vdc Between J2-J And J2-d And/Orp. 823
Multimeter Does Not Indicate 28 Vdc Between J2-N And J2-dAnd/Orp. 825
Schematicsp. 829
+wp0171p. 831
+tocp. 831
External Stores Support System (ESSS) Range Extension System HHp. 831
+Applicable Configurationp. 831
External Stores Support System (ESSS) Range Extension System Opep. 832
WHEN AUXILIARY FUEL MANAGEMENT CONTROL PANEL TEST PUSHBUTTON ISp. 852
DURING SELF-TEST, AUXILIARY FUEL MANAGEMENT CONTROL PANEL DIGITAp. 853
DURING SELF-TEST, AUXILIARY FUEL MANAGEMENT CONTROL PANEL DIGITAp. 854
AUXILIARY FUEL MANAGEMENT CONTROL PANEL EMPTY INDICATOR IS ON WIp. 854
WHEN AUXILIARY FUEL MANAGEMENT CONTROL PANEL STATUS PUSHBUTTON Ip. 856
WITH AUXILIARY FUEL MANAGEMENT CONTROL PANEL AUX FUEL QTY SWITCHp. 856
DIGITAL DISPLAY INDICATION CHANGES WITH DRAG BEAM SWITCH IN IN-Fp. 857
CDU TOTAL FUEL INDICATION INCREASES WHEN FUEL TRANSFER IS NOT ACp. 858
WITH MANUAL MODE SELECTED, CDU TOTAL FUEL INDICATION DOES NOT INp. 860
WITH MANUAL MODE SELECTED, CDU TOTAL FUEL INDICATION DOES NOT INp. 862
WITH MANUAL MODE SELECTED, CDU TOTAL FUEL INDICATION DOES NOT INp. 864
WITH MANUAL MODE SELECTED, CDU TOTAL FUEL INDICATION DOES NOT INp. 865
FUEL TRANSFER TIME AND/OR GAGING ACCURACY IS NOT AS SPECIFIEDp. 867
AUTO MODE FUEL TRANSFER LIMITS ARE NOT AS SPECIFIEDp. 867
AUXILIARY FUEL MANAGEMENT CONTROL PANEL EXTERNAL RIGHT NO FLOW Ip. 868
AUXILIARY FUEL MANAGEMENT CONTROL PANEL EXTERNAL LEFT NO FLOW INp. 869
AUXILIARY FUEL MANAGEMENT CONTROL PANEL EXTERNAL RIGHT INBD EMPTp. 870
MFD AUX FUEL LEGEND AND/OR AUXILIARY FUEL MANAGEMENT CONTROL PANp. 870
AUXILIARY FUEL MANAGEMENT CONTROL PANEL EXTERNAL INBD EMPTY AND/p. 871
VENT SENSOR OVFL INDICATOR DOES NOT GO ONp. 872
Schematicsp. 878
+wp0172p. 884
+tocp. 884
External Stores Support System (ESSS) Range Extension System MWp. 884
+Applicable Configurationp. 884
External Stores Support System (ESSS) Range Extension System Opep. 885
With Weight-On-Wheels Auxiliary Fuel Management Control Panel Sep. 900
Pressing Auxiliary Fuel Management Control Panel TEST/RESET Pushp. 900
Auxiliary Fuel Management Control Panel EMPTY Annunciator Is Onp. 901
CDU TOTAL FUEL Display Increases When XFER MODE Switch Is Set OFp. 902
R OUTBD To Main, XFER MODE Switch To MAN, CDU TOTAL FUEL Displayp. 903
L OUTBD To Main, XFER MODE Switch To MAN, CDU TOTAL FUEL Displayp. 906
L INBD To Main, XFER MODE Switch To MAN, CDU TOTAL FUEL Displayp. 909
R INBD To Main, XFER MODE Switch To MAN, CDU TOTAL FUEL Displayp. 912
XFER MODE Switch At AUTO, Fuel Transfer Limits Are Not As Specifp. 914
Auxiliary Fuel Management Control Panel R NO FLOW Annunciator Rep. 915
Auxiliary Fuel Management Control Panel L NO FLOW Annunciator Rep. 916
Auxiliary Fuel Management Control Panel R INBD EMPTY And/Or L INp. 916
Caution/Advisory Panel AUX FUEL Capsule And/Or Auxiliary Fuel Map. 917
Auxiliary Fuel Management Control Panel R OUTBD EMPTY And/Or L Op. 918
Auxiliary Fuel Management Control Panel VENT FAIL Or VENT OVFL Ap. 919
Schematicsp. 925
+tablesp. 884
Table 1.Error Codes.p. 887
+wp017201p. 933
+tocp. 933
Integrated Vehicle Health Management System (IVHMS) UH-60A UH-6p. 933
+IVHMS Operational Checkout Procedurep. 933
Operational Checkout Test Procedurep. 933
System Schematicp. 969
+tablesp. 933
Table 1.RAP Test Accelerometer Groups..p. 938
Table 2.Error/Malfunction.p. 940
Table 3.IVHMS CDU Signals Record Sheet.p. 943
Table 4.Fault Tolerances.p. 945
Table 5.Connector Locations.p. 946
+wp017202p. 994
+tocp. 994
Integrated Vehicle Health Management System (IVHMS) Cockpit/Nosep. 994
+IVHMS Troubleshooting Proceduresp. 994
CDU Does Not Operatep. 996
CDU Does Not Display Correct Datap. 997
DTU Does Not Operatep. 997
DTU Does Not Communicate With IVHMUp. 998
Main Rotor Speed (NR) IVHMS Signal Incorrectp. 998
Power Turbine Speed 1 (NP) IVHMS Signal Incorrectp. 999
Power Turbine Speed 2 (NP) IVHMS Signal Incorrectp. 1000
Gas Generator Speed 1 (NG) IVHMS Signal Incorrectp. 1001
Gas Generator Speed 2 (NG) IVHMS Signal Incorrectp. 1002
RDC Does Not Operatep. 1003
No IVHMS Indication For APU Generator ONp. 1003
No IVHMS Indication For Engine 1 Anti-Icep. 1004
No IVHMS Indication For Engine 2 Anti-Icep. 1005
No IVHMS Indication For Cargo Hook Armedp. 1005
No IVHMS Indication For Cargo Hook Openp. 1006
Pedal Position Potentiometer Signal Incorrectp. 1006
#1 Engine TGT Signal Incorrectp. 1007
#2 Engine TGT Signal Incorrectp. 1007
#1 Engine Torque Signal Incorrectp. 1008
#2 Engine Torque Signal Incorrectp. 1009
#1 Engine Oil Temperature Signal Incorrectp. 1010
#2 Engine Oil Temperature Signal Incorrectp. 1011
#1 Engine Oil Pressure Signal Incorrectp. 1012
#2 Engine Oil Pressure Signal Incorrectp. 1013
#1 Fuel Quantity Signal Incorrectp. 1014
#2 Fuel Quantity Signal Incorrectp. 1015
Main Module Oil Pressure Signal Incorrectp. 1016
Main Module Oil Temperature Signal Incorrectp. 1017
No IVHMS Indication For APU Oil Temperaturep. 1018
No IVHMS Indication For Main Module Oil Temperaturep. 1018
No IVHMS Indication For Hydraulic Stage 1 Switchp. 1019
No IVHMS Indication For Hydraulic Stage 2 Switchp. 1019
No IVHMS Indication For Intermediate Gearbox Oil Temperaturep. 1020
No IVHMS Indication For Tail Gearbox Oil Temperaturep. 1020
No IVHMS Indication For Apu Failp. 1021
No IVHMS Indication For Hydraulic Pump 1 Switchp. 1021
No IVHMS Indication For Hydraulic Pump 2 Switchp. 1022
No IVHMS Indication For Ice Detectionp. 1022
IVHMS Does Not Indicate Chip For #1 Engine When A Chip Existsp. 1023
IVHMS Does Not Indicate Chip For #2 Engine When A Chip Existsp. 1023
IVHMS Does Not Indicate Chip For RH Input Module When A Chip Exip. 1024
IVHMS Does Not Indicate Chip For LH Input Module When A Chip Exip. 1024
IVHMS Does Not Indicate Chip For RH Accessory Module When A Chipp. 1025
IVHMS Does Not Indicate Chip For LH Accessory Module When A Chipp. 1025
IVHMS Does Not Indicate Chip For Intermediate Gearbox When A Chip. 1026
IVHMS Does Not Indicate Chip For Main Module When A Chip Existsp. 1026
IVHMS DOES Not Indicate Chip For Tail Gearbox When A Chip Existsp. 1027
No IVHMS Indication For Weight On Wheels Lhp. 1027
No IVHMS Indication For Weight On Wheels RHp. 1028
OAT Signal Incorrectp. 1029
Doppler SDC NAV Signal Incorrect Pitch Attitudep. 1029
Doppler SDC NAV Signal Incorrect Roll Attitudep. 1030
Doppler SDC NAV Signal Incorrect Heading Symptomp. 1030
Doppler GPS Position Signal Incorrectp. 1031
Pitch Rate Gyro Signal Incorrectp. 1031
Roll Rate Gyro Signal Incorrectp. 1032
Yaw Rate Gyro Signal Incorrectp. 1032
Collective Stick Position Signal Incorrectp. 1033
Airspeed Signal Incorrectp. 1033
BARO ALT Signal Incorrectp. 1034
Altitude Rate Signal Incorrectp. 1035
Radar Altitude Signal Incorrectp. 1035
No IVHMS Indication For Pilot's ICS Transmit Switchp. 1036
No IVHMS Indication For Copilot's ICS Transmit Switchp. 1036
No IVHMS Recording of Pilot's Transmitted Audiop. 1037
No IVHMS Recording of Copilot's Transmitted Audiop. 1037
No IVHMS Intercom Audio Output from LH Disconnectp. 1037
Pilot's Uniaxial ROTAB Accelerometer INOPp. 1038
Copilot's Biaxial ROTAB Accelerometer INOPp. 1038
No IVHMS Ethernet Connectivity Through LH Disconnectp. 1039
System Schematicp. 1059
+wp017203p. 1076
+tocp. 1076
Integrated Vehicle Health Management System (IVHMS) Tail Pylon Up. 1076
+IVHMS Troubleshooting Proceduresp. 1076
Intermediate Gearbox Input Accelerometer (V22) Inopp. 1076
Intermediate Gearbox Output Accelerometer (V07) Inopp. 1077
Tail Rotor Gearbox Input Accelerometer (V24) Inopp. 1077
Tail Rotor Gearbox Output Accelerometer (V23) Inopp. 1077
Tail Rotor Magnetic RPM Sensor Inopp. 1078
System Schematicp. 1098
+wp017204p. 1099
+tocp. 1099
Integrated Vehicle Health Management System (IVHMS) Main Modulep. 1099
+IVHMS Troubleshooting Proceduresp. 1099
Main Rotor Optical Tracker Does Not Operatep. 1100
No Engine Indexingp. 1100
Left Input Module Output Accelerometer (V04) Inopp. 1101
Left Main Module Housing Accelerometer (V01) Inopp. 1101
Right Input Module Output Accelerometer (V03) Inopp. 1102
Right Main Module Housing Accelerometer (V02) Inopp. 1102
Tail Take Off Radial Accelerometer (V06) Inopp. 1102
Left Accessory Gearbox Accelerometer (V08) Inopp. 1103
Right Accessory Gearbox Accelerometer (V09) Inopp. 1103
Left Input Module Input Accelerometer (V05) Inopp. 1104
Right Input Module Input Accelerometer (V14) Inopp. 1104
Swashplate Vertical Accelerometer (V13) Inopp. 1104
Main Rotor Magnetic RPM Sensor Inopp. 1105
Oil Cooler Vertical Accelerometer (V10) Inopp. 1105
Oil Cooler Axial Accelerometer (V11) Inopp. 1106
System Schematicp. 1126
+wp017205p. 1131
+tocp. 1131
Integrated Vehicle Health Management System (IVHMS) Tailcone UHp. 1131
+IVHMS Troubleshooting Proceduresp. 1131
IVHMU does not operatep. 1131
Viscous Bearing #1 Accelerometer (V15) Inopp. 1132
Viscous Bearing #2 Accelerometer (V16) Inopp. 1133
Viscous Bearing #3 Accelerometer (V17) Inopp. 1133
Viscous Bearing #4 Accelerometer (V18) Inopp. 1133
System Schematicp. 1154
+wp017206p. 1157
+tocp. 1157
Integrated Vehicle Health Management System (IVHMS) Cabin UH-60p. 1157
+IVHMS Troubleshooting Proceduresp. 1157
Irregular Accelerometer Inop (Optional Field Installed Acceleromp. 1157
Digital Airframe (4g) Vertical Accelerometer Signal Incorrectp. 1158
Cockpit Heel Uniaxial ROTAB Accelerometer Inopp. 1158
Forward Absorber Uniaxial ROTAB Accelerometer Inopp. 1159
Aft Absorber Vibration Triaxial ROTAB Accelerometer Inopp. 1159
System Schematicp. 1179
+wp017207p. 1181
+tocp. 1181
+Underwater Acoustic Beacon UH-60A UH-60L IVHMS> .p. 1181
Underwater Acoustic Beacon Checkp. 1181
+wp0173p. 1183
+tocp. 1183
External Stores Support System (ESSS) External Tank Check MWO 5p. 1183
Special Instructionsp. 1183
+Applicable Configurationp. 1183
Setup Operational/Troubleshooting Procedurep. 1184
Outboard Tanks Installed Operational/Troubleshooting Procedurep. 1185
Inboard Tanks Installed Operational/Troubleshooting Procedurep. 1187
Shutdown Operational/Troubleshooting Procedurep. 1189
END OF WORK PACKAGEp. 1192
+wp0174p. 1193
+tocp. 1193
Forward Looking Infrared (FLIR) HH-60A HH-60L>. .p. 1193
+Special Instructionsp. 1193
Setup Operational/Troubleshooting Procedurep. 1193
Operational Check Operational/Troubleshooting Procedurep. 1194
Drift Compensation Operational/Troubleshooting Procedurep. 1200
Shutdown Operational/Troubleshooting Procedurep. 1201
MFD Does Not Display FLIR Image And MENU Page 1p. 1202
Pilot's MFD Does Not Indicate A FLIR Imagep. 1203
Copilot's MFD Does Not Indicate A FLIR Imagep. 1203
Error Code Is Displayed In Fault Isolation Test Sub-menup. 1204
Schematicsp. 1211
+wp0175p. 1216
+tocp. 1216
Forward Looking Infrared (FLIR) HH-60L> .p. 1216
+Special Instructionsp. 1216
Setup Operational/Troubleshooting Procedurep. 1216
Operational Check Operational/Troubleshooting Procedurep. 1217
Fault Isolation Test Operational/Troubleshooting Procedurep. 1228
Flir Azimuth Offset Adjustment Operational/Troubleshooting Procep. 1229
Shutdown Operational/Troubleshooting Procedurep. 1231
MFD Does Not Display FLIR Image and MENU Page 1p. 1231
Pilot's MFD Does Not Indicate a FLIR Imagep. 1232
Copilot's MFD Does Not Indicate a FLIR Imagep. 1232
Error Code is Displayed in Fault Isolation Test Sub-menup. 1232
Schematicsp. 1242
+tablesp. 1216
Table 1.FIT Error Codes.p. 1236
+wp0176p. 1246
+tocp. 1246
Crashworthy External Fuel System Maintenance Operational Checkp. 1246
+Applicable Configurationp. 1247
INITIAL AUXILIARY FUEL MANAGEMENT PANEL FUEL QUANTITY CHECKp. 1248
PRESSURE REFUELING/LEAK CHECKp. 1248
TANKS FULL AFMP FUEL QUANTITY CHECKp. 1249
FUEL TRANSFER PREPARATIONp. 1250
FUEL TRANSFER OPERATION-MANUAL MODE-LATERAL IMBALANCE CHECKp. 1250
FUEL TRANSFER OPERATION-AUTO MODEp. 1252
CRASHWORTHY EXTERNAL FUEL SYSTEM MAINTENANCE OPERATIONAL CHECK Cp. 1252
RIGHT OUTBOARD WING GATE VALVE NOT IN COMMANDED POSITIONp. 1253
RIGHT INBOARD WING GATE VALVE NOT IN COMMANDED POSITIONp. 1254
LEFT INBOARD WING GATE VALVE NOT IN COMMANDED POSITIONp. 1255
LEFT OUTBOARD WING GATE VALVE NOT IN COMMANDED POSITIONp. 1256
REFUEL VALVE NOT IN COMMANDED POSITIONp. 1258
TRANSFER PUMP DOES NOT RUN WHEN COMMANDEDp. 1259
TRANSFER PUMP CAVITATIONp. 1260
SLOW OR NO FUEL TRANSFERp. 1262
FUEL LEAKAGE FROM CAVITY DRAIN OR TANK SHELL SPLIT LINEp. 1266
ERRONEOUS FUEL QUANTITY DISPLAYp. 1267
NO EMPTY LIGHT WHEN FUEL TRANSFER IS COMPLETEp. 1269
EMPTY LIGHT ON WHEN TANK IS NOT EMPTYp. 1270
Schematicsp. 1273
+wp0177p. 1278
+tocp. 1278
Crashworthy External Fuel System Pressure Refueling Maintenancep. 1278
+Crashworthy External Fuel System Pressure Refueling Operational/p. 1278
PRESSURE REFUELING OPERATIONAL CHECKp. 1279
PRESSURE REFUELING OPERATIONAL CHECK COMPLETIONp. 1280
RIGHT OUTBOARD WING GATE VALVE NOT IN COMMANDED POSITIONp. 1281
RIGHT INBOARD WING GATE VALVE NOT IN COMMANDED POSITIONp. 1282
LEFT INBOARD WING GATE VALVE NOT IN COMMANDED POSITIONp. 1284
LEFT OUTBOARD WING GATE VALVE NOT IN COMMANDED POSITIONp. 1285
REFUEL VALVE NOT IN COMMANDED POSITIONp. 1286
CANNOT PRESSURE REFUEL CEFS TANK(S)p. 1287
TANK FILL LEVEL ABOVE GRAVITY FILL OPENING (PRESSURE REFUELED)p. 1289
FUEL LEAKAGE FROM CAVITY DRAIN OR TANK SHELL SPLIT LINEp. 1290
Schematicsp. 1294
+wp0178p. 1297
+tocp. 1297
+Cockpit Air Bag Systemp. 1297
Cockpit Air Bag System Operational/Troubleshooting Procedurep. 1297
ECSU Does Not Power Upp. 1298
A/C ID LED Remains Onp. 1299
Pilot's Or Copilot's No. 1 LED Remains Onp. 1299
Pilot's Or Copilot's No. 2 LED Remains Onp. 1300
Schematicsp. 1303
+wp0179p. 1304
+tocp. 1304
Microclimate Cooling Unit and Mask Blower Assembliesp. 1304
+Special Instructionsp. 1304
Electrical Operational/Troubleshooting Procedurep. 1304
Mechanical Operational/Troubleshooting Procedurep. 1306
#1 MCU DOES NOT RUNp. 1306
#2 MCU DOES NOT RUNp. 1307
#3 MCU DOES NOT RUNp. 1308
#4 MCU DOES NOT RUNp. 1309
PILOT'S MASK BLOWER DOES NOT POWER UPp. 1310
COPILOT'S MASK BLOWER DOES NOT POWER UPp. 1311
CREW MASK BLOWER 1 DOES NOT POWER UPp. 1312
CREW MASK BLOWER 2 DOES NOT POWER UPp. 1312
COOLANT DOES NOT FLOW AND MCS DOES NOT COOL PER BCA RANGE SETTINp. 1313
Schematicsp. 1318
+wp017901p. 1320
+tocp. 1320
Common Missile Warning SYSTEM (Cmws) And Improved Countermeasurep. 1320
Operational/Troubleshooting Procedurep. 1320
+SETUP OPERATIONAL CHECKOUTp. 1321
Pre–Test Checks.p. 1323
Stray Voltage Test Chaff Dispenser #1.p. 1324
Stray Voltage Test Flare Dispenser #2 And #3.p. 1325
Power-On Test.p. 1326
Audio Test.p. 1328
INITIATED BIT (IBIT) Test.p. 1328
System Safety Check.p. 1328
Fire Test For Chaff Dispenser #1.p. 1330
No Fire Test For Chaff Dispenser #1.p. 1331
Bad Ground Test For Chaff Dispenser #1.p. 1331
Chaff Bypass Dispense Test for Chaff Dispenser #1.p. 1331
Flare Fire Test for Flare Dispenser #2 and #3.p. 1332
No Fire Test for Flare Dispenser #2 and #3.p. 1333
Bad Ground Test for Flare Dispenser #2 and #3.p. 1334
Jettison Testing for Flare Dispenser #2 and #3.p. 1334
Number Sequence Test for Flare Dispenser #2 and #3.p. 1334
Flare Bypass Dispense Test for Flare Dispenser #2 and #3.p. 1335
Fault Procedure 1- CI Displays ECU Fail/Degradp. 1337
Fault Procedure 2- CI Displays LFWD Fail/Degradp. 1339
Fault Procedure 3- CI Displays RFWD Fail/Degradp. 1340
Fault Procedure 4- CI Displays LAFT Fail/Degradp. 1341
Fault Procedure 5- CI Displays RAFT Fail/Degradp. 1343
Fault Procedure 6- CI Displays SEQ1 Fail/Degradp. 1344
Fault Procedure 7- CI Displays SEQ2 Fail/Degradp. 1346
Fault Procedure 8- CI Displays S1DA Fail/Degradp. 1347
Fault Procedure 9- CI Displays S1DB Fail/Degradp. 1348
Fault Procedure 10- CI Displays S2DB Fail/Degradp. 1350
Fault Procedure 11- CI Displays ICE Fail/Degradp. 1351
Fault Procedure 12- CI Displays TEMP Fail/Degradp. 1352
Fault Procedure 13- CI Displays ZERO Fail/Degradp. 1353
Fault Procedure 14- CI Displays B/C Fail/Degradp. 1354
Fault Procedure 15 – CI Displays UDM Fail/Degradp. 1354
Fault Procedure 16 – COMM Fail/Degradp. 1355
Fault Procedure 17 – AW Fail/Degradp. 1356
Fault Procedure 18– Audio – No Audio from CMWSp. 1356
Fault Procedure 19 – CMWS INOP Indicator on Caution/Advisory Panp. 1357
Fault Procedure 20 – CMWS Inop Light LT Always Offp. 1359
Fault Procedure 21 – Stray Voltagep. 1360
Fault Procedure 22- Arming: No R Displayed on CI, CM ARMED Messap. 1363
Fault Procedure 23– Arming: No R Displayed on CI, but CM ARMED Mp. 1364
Fault Procedure 24- Arming: R is displayed on CI, but CM ARMED mp. 1367
Fault Procedure 25- ECU Fan – Fans Not Turning or Suspect AC Powp. 1368
Fault Procedure 26- Flare Dispense – No Dispense In Auto Modep. 1369
Fault Procedure 27– Flare Dispense – No Dispense In Bypassp. 1371
Fault Procedure 28– Chaff Dispense – No Dispense In Auto Modep. 1373
Fault Procedure 29 – Chaff Dispense – No Dispense In Bypass Modep. 1375
Fault Procedure 30- Inventory — Improper Report Chaffp. 1376
Fault Procedure 31 – Inventory – Improper Report Flarep. 1377
Fault Procedure 32– Jettison – Does Not Function in Auto Modep. 1377
Fault Procedure 33– Jettison – Does Not Function in Bypass Modep. 1378
Fault Procedure 34– Power – CMWS Power Upp. 1380
Fault Procedure 35– Power – No Power to Dispensers #1 and #2p. 1381
Fault Procedure 36– Power – No Power To Dispenser # 3p. 1383
+tablesp. 1320
Table 1. CMWS Bit Faults Displayed On CI And Procedure.p. 1321
+Binder3p. 1416
TM 1-1520-237-23-4 TROUBLESHOOTING PROCEDURES 1068p. 1416
TM 1-1520-237-23-4 TROUBLESHOOTING PROCEDURES 1069p. 1417
TM 1-1520-237-23-4 TROUBLESHOOTING PROCEDURES 1070p. 1418
TM 1-1520-237-23-4 TROUBLESHOOTING PROCEDURES 1071p. 1419
TM 1-1520-237-23-4 TROUBLESHOOTING PROCEDURES 1072p. 1420
TM 1-1520-237-23-4 TROUBLESHOOTING PROCEDURES 1073p. 1421
TM 1-1520-237-23-4 TROUBLESHOOTING PROCEDURES 1074p. 1422
TM 1-1520-237-23-4 TROUBLESHOOTING PROCEDURES 1075p. 1423
TM 1-1520-237-23-4 TROUBLESHOOTING PROCEDURES 1076p. 1424
TM 1-1520-237-23-4 TROUBLESHOOTING PROCEDURES 1077p. 1425
System Diagrams, Schematics and Test References
Throughout the UH-60A UH-60L EH-60A HH-60A HH-60L Volume 4 Troubleshooting Manual TM 1-1520-237-23-4, technical drawings are integrated directly with troubleshooting procedures. Component-location diagrams identify connectors, panels, controllers, detectors, relays, switches and other items on the aircraft. Electrical schematic diagrams show terminal designations, connector references, power sources and wiring paths used by the accompanying test instructions.
Later work packages continue this approach for systems such as the M130 chaff dispenser, XM130 chaff/flare dispenser, ESSS equipment, IVHMS and FLIR. IVHMS troubleshooting covers the CDU, DTU, IVHMU and numerous aircraft signals, including engine, rotor, hydraulic, fuel, temperature, oil-pressure, torque and caution/advisory inputs. The mission-equipment sections combine operational tests with test-set setup drawings, wiring checks and corrective-action sequences appropriate to their listed configurations.
Maintenance Setup and Safety Information
Work packages identify the test equipment, mechanic toolkits, special tools, required personnel, reference publications and aircraft conditions needed before testing begins. Warnings, cautions and notes are placed alongside procedures where personnel safety, electrical power, hot components, rotating equipment or system-specific hazards require particular attention. The opening warning summary also emphasizes that personnel performing procedures must observe the listed precautions.
The manual’s cover carries Distribution Statement D and states that distribution is authorized to the Department of Defense and U.S. DoD contractors only to protect critical technology. It also states that the document contains export-restricted technical data and directs dissemination in accordance with DOD Directive 5230.25. Access, possession and use must comply with the restrictions printed in the manual.
Technical Troubleshooting Reference in PDF Format
For an authorized technician working with the listed UH-60A, UH-60L, EH-60A, HH-60A or HH-60L configuration, this Volume 4 manual provides the detailed troubleshooting paths needed to perform operational checks, trace electrical and system faults, compare measured conditions with specified indications, identify suspect components and follow the applicable corrective action. Having the correct model effectivity, connector references, test values and schematic information together is important when diagnosing complex aircraft systems and avoiding decisions based on an unrelated configuration.
For eligible purchasers, the manual is supplied as an instant PDF download after payment. There is no physical book and no shipping delay. The PDF can be viewed on compatible computers, tablets and phones and printed where required for authorized maintenance use.
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