UH-60A UH-60L EH-60A HH-60A HH-60L Volume 4 Troubleshooting Manual TM 1-1520-237-23-4

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.

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.