Air Force T.O. 12P2-2TM55-1-3.pdf

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REPAIR -- PILOT WARNING ALARM SET
Solicitation number
FA852425Q0009
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This document is a Depot Maintenance Work Requirement (DMWR) for the RPM Limit Warning Detector Assembly used on the UH1N helicopter, dated 5 September 2025. The technical publication provides comprehensive maintenance instructions for an electronic component that monitors and warns about rotor and engine RPM limits. The manual covers detailed procedures for depot-level maintenance, including technical support requirements, preshop analysis operations, overhaul procedures, quality assurance, and technical specifications.

The RPM Limit Warning Detector Assembly is a single, self-contained unit with specific technical parameters, including an operating power input of 28 ±2 VDC, operating temperature range of -67 to +159.8°F, and overall physical dimensions of 6.92 inches length, 3.55 inches width, and 1.9 inches height. The manual includes extensive troubleshooting guidelines for high and low rotor and engine RPM limits, with precise testing procedures using specialized test equipment like signal generators, digital multimeters, and electronic counters. The document is marked with a Distribution Statement C, authorizing distribution to U.S. Government agencies and their contractors, and contains multiple warnings about technical data export restrictions.

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Text version

TO 12P2-2TM55-1-3

5 SEPTEMBER 2025

IDENTIFYING TECHNICAL PUBLICATION SHEET

FOR

COMMERCIAL MANUAL

1. PURPOSE: This Identifying Technical Publication Sheet (ITPS) is issued for the purpose of identifying an authorizing the following commercial manual for the Air Force.

MANUFACTURER:

CONTRACT NO:

PURCHASE ORDER NO: N/A

REQUISITION NO: N/A

EQUIPMENT: RPM LIMIT WARNING DETECTOR ASSEMBLY

TITLE: OVERHAUL MANUAL FOR RPM LIMIT WARNING DETECTOR ASSEMBLY

ADDITIONAL IDENTIFICATION: USED ON UH1N

PUBLICATION DATE: 28 FEBRUARY 1990

DISCLOSURE NOTICE - 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 Air Force 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 Untied 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 C - Distribution authorized to U.S. Government agencies and their contractors (Critical Technology) (5 September 2025). Refer other requests for this document to AFLCMC/WIUBC, Robins AFB, GA 31098.

WARNING - This document contains technical data whose export is restricted by the Arms Export Control Act (Section 2751 of Title 22, United States Code) or the Export Control Reform Act of 2018 (Chapter 58 Sections 4801-4852 of Title 50, United States Code).

Violations of these export laws are subject to severe criminal penalties. Disseminate in accordance with provisions of DoD Directive

5230.25 and DoD Instruction 2040.

Published Under Authority of the Secretary of the Air Force

NOTICE: Reproduction for non-military use of the information or illustrations contained in this publication is not permitted. The policy for military reproduction is established for the Army in AR 38-4, for the Navy and Marine Corp in OPNAVINST 5510.1, and for the Air Force in AFPD 34-1.

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