Sikorsky UH-60A UH-60L EH-60A HH-60A HH-60L Aviation Unit and Intermediate Maintenance Manual TM 1-1520-237-23-3 Volume 3 (2014) – PDF Download

Description

Sikorsky UH-60A UH-60L EH-60A HH-60A HH-60L Aviation Unit and Intermediate Maintenance Manual TM 1-1520-237-23-3 Volume 3

This is the third volume of the U.S. Army aviation unit and intermediate maintenance technical manual covering the Sikorsky UH-60A, UH-60L, EH-60A, HH-60A and HH-60L utility tactical transport helicopters. Volume 3 is built around the chapter-3 troubleshooting procedures, electrical systems, fuel systems and mechanical flight controls, and it carries the full complement of operational checkout tests, corrective action paths, schematic diagrams and location diagrams needed to isolate and fix faults on these aircraft.

The document is written for MOS 15F aircraft electricians and MOS 15T UH-60 helicopter repairers working at the aviation unit (AVUM) and intermediate (AVIM) maintenance levels, and it is equally useful to any owner, operator or maintainer of a UH-60-series airframe who needs the genuine troubleshooting logic, test-point values and wiring references for the aircraft’s major systems.

File Details

• Manual type: Aviation unit and intermediate maintenance technical manual (AVUM/AVIM)
• Document number: TM 1-1520-237-23-3
• Volume: Volume 3
• Date of issue: 30 May 2014
• Issuing authority: Headquarters, Department of the Army
• Brand / manufacturer: Sikorsky
• Models covered: UH-60A, UH-60L, EH-60A, HH-60A, HH-60L
• Language: English
• File format: PDF

Chapters and Work Packages Covered

The active portion of this volume is Chapter 3 – Aviation Unit and Intermediate Troubleshooting Procedures. The troubleshooting work packages, listed in the manual’s table of contents, include:

• AC Electrical System (WP 0105 00)
• DC Electrical System (WP 0106 00)
• Mission Electrical Interface EH-60A (WP 0107 00)
• System Circuit Breakers (WP 0108 00)
• Instrument Panel Lights (WP 0109 00)
• Upper and Lower Console Lights (WP 0110 00)
• Cabin Dome Lights (WP 0111 00)
• Cockpit Flood and Secondary Lights (WP 0112 00)
• Utility and Maintenance Lights (WP 0113 00)
• Instrument Panel and Consoles Indicator Lights Dimming (WP 0114 00)
• Formation Lights (WP 0115 00)
• Controllable Searchlight (WP 0116 00)
• Position Lights (WP 0117 00)
• Retractable Landing Light (WP 0118 00)
• Anti-collision Lights (WP 0119 00)
• Cargo Hook Lights (WP 0120 00)
• ECM Antenna Actuator Assembly EH-60A (WP 0121 00)
• Fuel Boost Pump Control Panel (AVIM) (WP 0122 00)
• ECM Antenna Actuator Assembly (AVIM) EH-60A (WP 0123 00)
• Right Hand Relay Panel (AVIM) (WP 0124 00)
• Left Hand Relay Panel (AVIM) (WP 0125 00)
• AC Electrical System HH-60A/HH-60L (WP 0126 00)
• DC Electrical System HH-60A/HH-60L (WP 0127 00)
• Upper and Lower Console Lights HH-60A/HH-60L (WP 0128 00)
• Instrument Panel Lights HH-60A/HH-60L (WP 0129 00)
• Instrument Panel and Consoles Indicator Lights Dimming HH-60A/HH-60L (WP 0130 00)
• Fuel Low Level Warning System (WP 0131 00)
• Submerged Fuel Boost Pump System (WP 0132 00)
• Fuel Prime Boost System (WP 0133 00)
• Pressure Refuel/Defuel System (WP 0134 00)
• Fuel Quantity System Using Test Set TF-579 (WP 0135 00)
• Fuel Quantity System Using Test Set PSD60-1AF (WP 0136 00)
• Fuel Quantity System Harness Adapter (AVIM) (WP 0137 00)
• Cyclic Stick Assembly (WP 0138 00)
• Collective Stick Assembly (WP 0139 00)
• Flight Controls (Mechanical) (WP 0140 00)
• Roll SAS Assembly (AVIM) (WP 0141 00)
• Yaw Boost Assembly (AVIM) (WP 0142 00)
• Pitch Trim Actuator (AVIM) (WP 0143 00)
• Pilot-assist Module (AVIM) (WP 0144 00)

Taken as a whole, the volume hands the technician a complete operational and troubleshooting framework for the aircraft’s electrical distribution, external and cockpit lighting, fuel delivery and quantity measurement, and mechanical flight control systems. Every work package is laid out as an Operational Checkout Test Procedure followed by numbered corrective-action branches, so a fault is isolated by following the same sequence a flight-line technician would use on the aircraft. Most work packages close with a dedicated troubleshooting procedure keyed to specific symptoms — for example the “NO. 1 PUMP LIGHT DID NOT GO ON AND #1 FUEL PRESS CAPSULE OR LEGENDS DID NOT GO OFF” branch in the submerged fuel boost pump system — and each branch ends in a terminal corrective action such as replacing a relay, contactor, circuit breaker, probe, actuator or wiring run.

What This Manual Lets You Do

This is a full troubleshooting document, not a simple description. It gives you the actual component identifiers, wire terminations, test points, voltages and resistance values needed to trace a fault through the Sikorsky UH-60A/UH-60L/EH-60A/HH-60A/HH-60L electrical and flight control systems.

Typical jobs the manual supports include:

• Troubleshooting the AC electrical system from the APU generator, No. 1 and No. 2 generator systems, and AC external power through to the 26 VAC power system and the 115 VAC 3Ø 400 Hz utility receptacle.
• Isolating DC electrical faults in the battery circuit, No. 1 and No. 2 converters, utility DC, mission interface power on the EH-60A, and the UH-60L battery low sensing and shutdown functions.
• Diagnosing cockpit, cabin, console, instrument panel, formation, position, anti-collision, searchlight, landing light and cargo hook lighting faults.
• Fault isolation on the fuel low level warning system, submerged fuel boost pump system, fuel prime boost system, pressure refuel/defuel system, and the fuel quantity system using Test Set TF-579 or Test Set PSD60-1AF.
• Using the AVIM-level procedures for the fuel boost pump control panel, ECM antenna actuator assembly, and the left and right hand relay panels, including the T1 current sensor, the K20 DC essential bus fail relay, the K21 windshield anti-ice lockout relay, the K26 No. 2 engine start relay, the K32 hydraulic accumulator relay, the K41 searchlight relay, and the K45 No. 1 engine start relay.
• Checking the cyclic stick assembly grip and slew-up switch, and the collective stick assembly, against the resistance tables and continuity checks the manual provides.
• Performing the binding, in-flight attitude oscillation, and flight control noise checkout procedures on the mechanical flight controls, including rod inspection for loose swaged inserts and riveted-type pushrod rod ends.
• Bench-testing the Roll SAS assembly, Yaw Boost assembly, Pitch Trim actuator and Pilot-assist module using the specified nulling fixtures and test setups.

Why It Matters

On a UH-60-series helicopter, a misdiagnosed electrical or flight control fault is not just an inconvenience — it can cascade into a grounded airframe or a safety issue. The manual’s step-by-step corrective actions are the difference between swapping parts and correctly isolating the failed relay, contactor, circuit breaker, wiring run, limit switch or servo. Values such as the specified 21 to 27 volt regulator bus voltage, the 112.5 to 117.5 VAC generator output window, the 380 to 420 Hz frequency range, and the specific resistance bands for the fuel low level thermistors are all included so a technician can confirm a good component against a known reference.

The volume also includes the schematic and location diagrams that turn a wire number into a physical connector. AC electrical system location diagrams, AC electrical system schematic diagrams, AC power distribution diagrams, DC electrical system location and schematic diagrams, fuel low level warning system schematics, fuel quantity system schematics, tail rotor quadrant warning schematics, and the flight control system location diagrams are all present so a fault can be traced from the cockpit switch to the airframe connector.

Documentation Coverage

The full document number is TM 1-1520-237-23-3, issued 30 May 2014. It covers the following tail numbers / NSNs as printed on the cover:

• UH-60A — NSN 1520-01-035-0266 (EIC: RSA)
• UH-60L — NSN 1520-01-298-4532 (EIC: RSM)
• EH-60A — NSN 1520-01-082-0686 (EIC: RSB)
• HH-60A — NSN 1520-01-459-9468 (EIC: RSN)
• HH-60L — NSN 1520-01-471-6743 (EIC: RSI)

Because the volume spans five airframe variants, some procedures are variant-specific and are called out as such — for example EH-60A-only mission electrical interface work packages, or HH-60A/HH-60L-only AC and DC electrical system work packages. Configuration notes throughout flag EMEP vs. W/O EMEP, MOD vs. W/O MOD, RIS modifications, MWO 50-56, MWO 50-77, MWO 50-78, MWO 50-93 and CMWS equipment so the correct branch is selected for the aircraft being worked on.

Delivery

The manual is delivered instantly as a PDF download after checkout — no shipping, no waiting on a physical book. It opens on any device that reads PDFs (desktop, laptop, tablet or phone) and can be printed if you prefer a paper copy in the hangar or on the bench. Because it is a PDF, you can search within the file for a work package number, a wire number or a component name and jump straight to the correct procedure.