TM 55-2840-254-23
4-55 INSPECT SECOND TURBINE DISC ASSEMBLY (AVIM)
4-55
INITIAL SETUP
Applicable Configurations:
All
Tools:
Technical Inspection Tool Kit,
NSN 5180-00-323-5114
Materials:
None
Personnel Required:
68B30 Aircraft Powerplant Inspector
Equipment Condition:
Off Engine Task
1. Inspect rotor blades (1) and second turbine disc
assembly (2). There shall be no cracks.
a. Inspect blades (1).
(1) There shall be no nicks deeper than 0.015
inch.
(2) There shall be no bent or distorted blades.
(3) Tip rubs shall not be deeper than 0.010
inch.
(4) Surface oxidation is acceptable provided
there is no burning or loss of material.
b. Inspect sealing plates (3). There shall be no
loose or missing sealing plates.
c. Inspect disc face (4). Scoring shall not be
deeper than 0.010 inch. This limit does not
apply to area (5) where material has been re-
moved for balancing.
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