TM 1-1520-253-23
f. While using this manual, such adjectives as left and right, upper and lower, front and rear,
forward and aft, and clockwise and counterclockwise refer to the helicopter as viewed from the rear
(aft), looking forward.
g. Changes and supplements to this manual will be published when necessary to add, delete,
or change the scope of requirements. Such changes will be based on factual data accumulated as
a result of maintenance experience with the equipment. Suggested new or revised field developed
inspection procedures or changes to this manual are encouraged and should be made by
submitting a DA Form 2028. Mail to: U.S. Army Aviation and Missile Command, ATTN:
AMSAM-MMC-MA-NP, Redstone Arsenal, AL. 35898-5230.
h. These NDI procedures are directive in nature and deviation without prior approval is limited
to compensation for differences in equipment output. Equipment settings, when given, are
reference points only, due to the widely varying outputs from different inspection equipment. The
condition that must be satisfied for accurate inspection is that the inspection equipment be adjusted
to obtain the specified response from the setup or defect standard or the specified density reading
on radiographic film. Trained NDI technicians are qualified to make these adjustments.
GENERAL INFORMATION.
CAUTION
Misinterpretation of indications can result in rejectable parts being accepted and
acceptable parts being rejected. Only NDI personnel trained and qualified in accor-
dance with applicable military standards and technical manuals shall perform and
interpret nondestructive inspections.
a. This manual provides necessary information to enable qualified personnel to perform NDI
on CH/MH-47 helicopter series. The selection of components in this manual is based on a review
of applicable technical manuals listed in Table 1-1. All existing NDI callouts were updated. New NDI
procedures were developed for those parts that required check, inspect, or any other NDI related
actions. Section I of this manual contains a list of special terms, abbreviations, acronyms,
information on how to use the manual, use of NDI symbols, and a list of publications. Section I also
contains general information on the CH/MH-47 helicopter series, including descriptive data, access
panels, major assemblies, stops, handholds, walkways, various NDI method descriptions, and
rules of safety to be observed during nondestructive inspections.
b. Additional information on inspection methods can be found in the Technical Manual,
Nondestructive Inspection Methods, TM 55-1500-335-23. Detailed inspection procedures for each
main aircraft group are given in Sections II through VI of this manual.
Change 1
