TM55-2840-251-23
SECTION VIII GENERAL MAINTENANCE PROCEDURES (Continued)
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DISASSEMBLY (Cont)
10. Hardware Identification:
Correct engine reassembly procedures require that
particular attention be paid to the material requirements
for nuts and bolts used in the hot section of the engine.
In those areas where parts must be of material which is
resistant to high operating temperatures, special heat-
resistant alloys are employed. It is imperative that at
reassembly of the engine or its components, the
properly identified part (if serviceable) be reassembled
in its original location.
Code systems employ the use of the letter C for
corrosion resistant steel for normal application and H for
heat-resistant alloys in hot-section applications. The
stamped or embossed letter will be followed by a
number of one or more digits, e. g. CI, C8, H3 and
H12, the digit signifying the material specification. Bolt
code identification usually appears on the top of the
head, and nut identification on one side of the hexagon.
When the application is an AN or MS six-digit part
number, the code identification C or H will be preceded
by the letter E, e. g. EC3 or EK10.
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