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  TM 1284025223-2
Technical Manual
HEADQUARTERS
DEPARTMENT OF THE ARMY
NO. 1284025223
WASHINGTON D.C., 1 December 1994
TECHNICAL MANUAL
Aviation Unit and Aviation Intermediate Maintenance Manual
ENGINE, GAS TURBINE, MODEL T55L714
NSN 2840013537635
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, 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 rpovide DA Form 2028 information to AMCOM via email,
fax, or the World Wide Web. Our fax number is: DSN 7886546 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,
dated 1 December 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
NOTE
This manual is printed in three volumes as follows:
TM 12840252231, consisting of Table of Contents, Chapter 1, Chapter 2, pages 21 through 2322
TM 12840252232, consisting of Table of Contents, Chapter 2, pages 2323 through 2425/(2426
blank), Chapter 3, Chapter 4, Chapter 5, Chapter 6, pages 61 through 6182.
TM 12840252233, consisting of Table of Contents, Chapter 6, pages 6183 through 6265/(6266
blank), Chapter 7, chapter 8, and Chapter 9, Appendix A through Appendix G, and an Alphabetical Index.
The Appendices and Index are applicable to Volumes 1 through 3.
PAGE
HOW TO USE THIS MANUAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
vii
CHAPTER 1.
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 . . . . . . . . . . . . . . . . . . .
147
Section V
Service Upon Receipt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
149
Section VI
Hoisting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1111
Section VII
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1121
Section VIII
Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1297
Section IX
Preventive Maintenance Checks and Services . . . . . . . . . . . . . . . . . .
1317
Section X
Maintenance Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1487
Section XI
Preparation for Storage and Shipment . . . . . . . . . . . . . . . . . . . . . . . . .
1509
Section XII
Standard Torque Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1567
Section XIII
Standard Practices and Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . .
1571
Change 1
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