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TM 55-1520-210-23-1

87th Edition, February 1991

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Product Details:

  • Revision: 87th Edition, February 1991
  • Published Date: September 30, 1987
  • Status: Active, Most Current
  • Document Language:
  • Published By: US Army (ARMY)
  • Page Count: 13
  • ANSI Approved: No
  • DoD Adopted: No

Description / Abstract:



a. This manual is the official document for Aviation Unit and Intermediate Maintenance of Army Model UH-1V, UH-1H, EH-1H, and EH-IX Helicopters.

b. The purpose of this manual is to familiarize you with the maintenance functions to be performed at the Aviation Unit (AVUM) and Intermediate Maintenance (AVIM) levels. The Table of Contents for this manual is provided to assist in determining the chapter in the manual in which individual functions are covered. This manual provides all essential information for personnel to accomplish Aviation Unit and Intermediate Maintenance on the complete airframe, its components, and systems, excluding armament and avionics subsystem as indicated for Aviation Unit and Intermediate Maintenance activities in the Maintenance Allocation Chart (MAC). (Refer to Appendix B.)

P-2. Quality Assurance/Quality Control (QA/ QC). Personnel will assure proper maintenance has been performed by verifying dimensions and tolerances contained throughout this technical manual have been complied with.

P-3. Description. Army helicopter models UH-1V, UH-1 H, EH-1 H, and EH-1X are single engine, utility type helicopters. The EH-1 H and EH-1X are especially configured for electronic counter measures missions. The fuselage is all metal construction consisting of the forward section and aft section (tailboom). The forward section provides support for the cabin, landing gear, power plant, fuel cells, transmission, and tailboom. The rotor system consists of two bladed semirigid main rotor and a two bladed, delta hinged tail rotor.

P-4. Reporting of Errors. Every effort is made to keep this publication current and error free. Review conferences with using personnel, and a constant review of accident and flight test reports assure inclusion of the latest data in this publication. However, we cannot correct an error unless we know of its existence. In this regard it is essential that you do your part. Reports of errors, omissions, and recommendations for improving this publication by you are encouraged. Submit changes for improving this publication on DA Form 2028 (Recommended Changes to Publications and Blank Forms) to: Commander, U.S. Army Aviation and Missile Command , ATTN: AMSAM-MMC-LS-LP, Redstone Arsenal, AL 35898-5230.

P-5. Destruction of Army Material to Prevent Enemy Use. For destructions of Army material to prevent enemy use, refer to TM 750-244-1-5.

P-6. Maintenance of Forms and Records. Mai ntenance of forms, records, and reports which are to be used by maintenance personnel at all maintenance levels are listed in and prescribed by DA PAM 738-751.

P-7. Authority for Substitution. Substitution of interchange of items of material for maintenance or Department of the Army aircraft/helicopter shall not be authorized, nor shall orders be issued for shipment. Substitution or interchangeability shall only be authorized by AMCOM.

P-6. Special Tools and Equipment. Aviation Unit (AVUM) and Intermediate Maintenance (AVIM) special tools and equipment will be found in TM 55-1520-210-23P Repair Parts and Special Tools List (RPSTL). Special tools and test equipment for complex tasks are included in this manual.

P-9. Calibration.

a. Helicopter components, accessories, and instruments requiring calibration are specified in Chapter I.

b. Special tools and test equipment shall be calibrated as specified in TB 750-25, Army Metrology and Calibration System and TB 43-180, Calibration Procedure.

P-10. Storage. Refer to TM 740-90-1 and to Appendix E for Storage of Aircraft.

P-11. Explanation of Change Symbols. Changes, except as noted below to the text and tables, including new material on added pages, are indicated by a vertitle line in the outer margin extending close to the entire area of the material affected: exception; pages with emergency markings, which consist of black diagonal lines around three edges, may have the verticle line or change symbol placed along the inner margins,

Symbols show current changes only. A miniature pointing hand symbol is used to denote a change to an illustration. However, avertical bar in the outer margin, rather than miniature pointing hand is utilized where there have been extensive changes made to an illustration. Change symbols are not utilized to indicate changes in the following:

a. Introductory material.

b. Indexes and tabular data where changes cannot be identified.

c. Blank space resulting from the deletion of text, an illustration, or a table.

d. Correction of minor inaccuracies, such as spelling, punctuation, relocation of material, etc., unless such correction changes the meaning of instructive information and procedures.

P-12. Engineering Authorization. All request for engineering authorization, when required by this manual will be forwarded to USA AMCOM, ATTN: AMSAM- AR-El-B-U, Redstone Arsenal, AL 35898-5230. Urgent requests shall be clearly identified to insure priorlty handling and response. The requests shall include detailed information on the problem, e.g. sketches, photographs, dimensional data, etc., to assist in the evaluation and prompt reply.

P-13. Designator Symbols. Designator svmbols H, V, CB, or MB  are used in conjunction with text contents, text headings and illustration titles to show limited effectivity of the material. One or more designator symbols may follow a text heading or illustration titles to show limited effectivity of the material. One or more designator symbols may follow text heading or illustration title to indicate proper effectivity, unless the material applies to all models an configurations within the manual. If the material applies to all series and configurations, no designator symbols will be used. Where practical, descriptive information shall be condensed and combined for all models to avoid duplication. The symbol H refers to UH-1 H, V refers to UH-IV. The symbol C refers to the composite main rotor blade and MB refers to the metal main rotor blade.