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LIST OF EFFECTIVE PAGES (CONT)		Up
TM-55-2840-254-23-1 Engine Gas Turbine Model T55-L-712 Manual		Next
TABLE OF CONTENTS (Continued)

TM 55­2840­254­23
Technical Manual
HEADQUARTERS
DEPARTMENT OF THE ARMY
NO. 55­2840­254­23
WASHINGTON D.C., 26 April 1983
TECHNICAL MANUAL
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 10, dated 30 September 1996, 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.
TM 55­2840­254­23­3, consisting of Warning Pages, Table of Contents, Chapter 3 through 5 and Alphabetical
index.
TM 55­2840­254­23­4, consisting of Warning Pages, Table of Contents, Chapter 6 through 9, Appendixes
A through F, Glossary, and Alphabetical Index.
Change 11
i

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