ROTOR SUPPORT MAST SUPPORT BASE REMOVAL/INSTALLATION continued
e. Clean sealing compound from top of four cov-
ers (11) and (12) (para 1.47).
f. Remove and discard four covers (11) and (12)
from mast base (1).
a. Remove adhesive from mast base and light-
ening holes. Use cloth (item 47, App F).
b. Clean mast base and lightening holes (para
c. Remove paint from lightening holes
a. Check mast base and transmission struts for
cracks. None allowed.
b. Check mast base and transmission struts for
nicks, scratches, and gouges.
(1) Acceptable without rework: nicks, scratches,
and gouges that do not penetrate surface
(2) Rework for nicks and gouges: maximum al-
lowable depth for zone 1 is 0.070 INCH; zone
2 is 0.050 INCH; and zone 3 is 0.007 INCH.
c. Check mast base for corrosion (para 1.49).
(1) Maximum allowable depth for zone 1 (all
areas not specified) is 0.015 INCH; zone 2
(upper and lower flanges, and tapered ends)
is 0.050 INCH; zone 3 (mast bolt circle) is
0.005 INCH; and zone 4 (lug ends) is 0.150
d. Check walls and bottom area of lightening
holes for dirt, fluid, and debris. None allowed.
Use flashlight and mirror.
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