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report errors or to recommend changes.
1-1-5. Appendix A, Reference.
Appendix A is a listing of official publications cited within
the manual applicable to and available to flight crews.
1-1-6. Appendix B, Abbreviation.
Appendix B is a list of the abbreviations used in this
manual.
1-1-7. Appendix C, Conditional Inspections.
Appendix C is a listing of conditions which require a DA
Form 2408-13-1 entry.
1-1-8. Index.
The index lists in alphabetical order, every titled paragraph,
figure, and table contained in this manual.
1-1-9. Army Aviation Safety Program.
Reports necessary to comply with the Army Aviation
Safety program are prescribed in AR 385-40.
1-1-10. Destruction of Army Material to Prevent Enemy
Use.
For information concerning destruction of Army material
to prevent enemy use, refer to TM 750-244-1-5.
1-1-11. Forms and Records.
Army aviators flight record and aircraft maintenance records
which are to be used by crewmembers are prescribed
in DA PAM 738-751 and TM 55-1500-342-23.
1-1-12. Change Symbol Explanation.
Changes, except as noted below, to the text and tables,
including new material on added pages, are indicated by
a vertical line. The vertical line is in the outer margin and
extends close to the entire area of the material affected
with the following exception: pages with emergency
markings, which consist of black diagonal lines around
three edges, may have the vertical 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, a vertical
line in the outer margin, rather than miniature pointing
hands, is used when there have been extensive changes
made to an illustration. Change symbols are not used to
indicate changes in the following:
a. Introductory material.
b. Indexes and tabular data where the change cannot
be identified.
c. Blank space resulting from the deletion of text, an
illustration, or table.
d. Correction of minor inaccuracies, such as spelling,
punctuation, relocation of material, ect., unless such
correction changes the meaning of instructive information
and procedures.
TM 1-1520-240-10
1-1-2
1-1-13. Aircraft Designation System.
1-1-14. The designation system prescribed by AR 70-50
is used in aircraft designation as follows:
Example CH-47D
C - Mission symbol (cargo)
H - Basic mission and type symbol (Helicopter)
47 - Design number
D - Series symbol
1-1-15. Series and Effectivity Codes.
Designator symbols listed below are used to show limited
effectivity of airframe information material in conjunction
with text content, paragraph titles, and illustrations. Designators
may be used to indicate proper effectivity, unless
the material applies to all models and configuration
within the manual. Designator symbols precede procedural
steps Designator symbols listed below are used to
show limited effectivity of airframe information material in
conjunction with text content, paragraph titles, and illustrations.
Designators may be used to indicate proper
effectivity, unless the material applies to all models and
configuration within the manual. Designator symbols
precede procedural steps in Chapters 5, 8 and 9. If the
material applies to all series and configurations, no designator
symbol will be used.
DESIGNATOR APPLICATION
SYMBOL
712 CH-47D aircraft equipped
With T55-L-712 engines.
714A CH-47D aircraft equipped
with T55-GA-714A engines
1-1-16. Use of “Shall, Should, and May”.
Within this technical manual, the word “shall” is used to
indicate a mandatory requirement. The word “should” is
used to indicate a nonmandatory but preferred method
of accomplishment. The word “may” is used to indicate
an acceptable method of accomplishment.
1-1-17
TM 1-1520-240-10
2-1-1
CHAPTER 2
AIRCRAFT AND SYSTEMS DESCRIPTION AND OPERATION
SECTION I. HELICOPTER
2-1-1. General.
The CH-47D (fig. FO-1, 2-1-1 and 2-1-2) is a twin-turbine
engine, tandem rotor helicopter designed for transportation
of cargo, troops, and weapons during day, night, visual, and
instrument conditions. (Unless otherwise noted, numbers
refer to fig. FO-1.) The helicopter is powered by two
T55-L-712 or T55-GA-714A shaft-turbine engines (18) on
the aft fuselage. The engines simultaneously drive two tandem
three-bladed counterrotating rotors (13 and 19) through
engine transmissions (25), a combining transmission (16),
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