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  TM 55284025423
Technical Manual
HEADQUARTERS
DEPARTMENT OF THE ARMY
NO. 55284025423
WASHINGTON D.C., 26 April 1983
Aviation Unit and Aviation Intermediate
Maintenance Manual
ENGINE, GAS TURBINE
MODEL T55L712
(NSN 2840010304890)
REPORTING ERRORS AND RECOMMENDING IMPROVEMENTS
You can help improve this manual. If you find any mistakes, or if you know of a way to improve these
procedures, please let us know. Mail your letter or DA Form 2028 (Recommended Changes to
Publications and Blank Forms), or DA Form 2028-2 located in the back of this manual directly to:
Commander, US Army Aviation and Missile Command, ATTN: AMSAM-MMC-MANP, Redstone
Arsenal, AL 358985000. A reply will be furnished to you. You may also provide DA Form 2028 information
to AMCOM via e-mail, fax, or the World Wide Web. Our fax number is: DSN 788-6546 or Commercial
2568426546. Our email address is: 2028@redstone.army.mil. Instructions for sending an electronic
2028 may be found at the back of this manual immediately preceding the hard copy 2028. For the World
Wide Web use: https://amcom2028.redstone.army.mil.
OZONE DEPLETING CHEMICAL INFORMATION
This document has been reviewed for the presence of class I ozone depleting chemicals. As of the basic
through change 05, dated 04 November 1994, all references to Class I ozone depleting chemicals have
been removed from this document by substitution with chemicals by the Engineering, Environment, and
Logistics Oversight Office that do not cause atmospheric ozone depletion.
DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited
TABLE OF CONTENTS
PAGE
HOW TO USE THIS MANUAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii
CHAPTER I.
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Chapter Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Section I
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Section II
Equipment Description and Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Section III
Principles of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Section IV
Repair Parts; Special Tools; Test, Measurement, and Diagnostic
Equipment (TMDE); and Support Equipment . . . . . . . . . . . . . . . . . . . 141
Section V
Service Upon Receipt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
Section VI
Hoisting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1109
Section VII
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1119
Section VIII
Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1219
Section IX
Preventive Maintenance Checks and Services . . . . . . . . . . . . . . . . . . 1239
Section X
Maintenance Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1443
Section XI
Preparation for Storage and Shipment . . . . . . . . . . . . . . . . . . . . . . . . . 1553
Section XII
Standard Torque Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1623
Section XIII
Standard Practices and Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . 1627
NOTE
This manual is printed in four volumes as follows:
TM 552840254231, consisting of Warning Pages, Table of Contents, Chapter 1, and alphabetical index.
TM 552840254232, consisting of Warning Pages, Table of Contents, Chapter 2, and alphabetical index.
betical Index.
TM 552840254234, consisting of Warning Pages, Table of Contents, Chapter 6 through 9, Appen-
dixes AthroughF, Glossary, and Alphabetical Index.
Change 7
i
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