TM 1-1520-238-23
2-310
Change 1
2.88.
ROTOR SUPPORT MAST SUPPORT BASE REMOVAL/INSTALLATION – continued
(10) Maximum allowable depth for circular cavity:
(a) Section “F” side walls (two area seg-
ments measured from a starting point on
the inside wall at the hole centerline go-
ing 0.650 INCH outboard on both sides)
are 0.125 INCH (this measurement ex-
tends from lip to center of bottom radius);
remaining inside walls and bottom of cav-
ities are 0.265 INCH (this measurement
extends 0.265 INCH beyond the hole lip).
Use flashlight and mirror.
g. Check strut bolt holes on mast base for
elongation. None allowed.
h. Check rotor support assembly for corrosion
(para 1.49).
i. Check rotor support assembly bearing stak-
ing area for cracks and damage. None allowed.
j. Check rotor support assembly bearing for
binding, catching, metal chips and other con-
tamination. None allowed.
2.88.6. Repair
a. Remove nicks, gouges, and scratches from
mast base.
(1) Blend smooth; ensure minimal material loss.
Use paper (item 133, App F).
(2) Check reworked area for cracks using pene-
trant inspect (TM 1-1500-204-23). None al-
lowed.
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M04-3086-15
DENOTES MAXIMUM PITTING ALLOWED
*
MAST FLANGE
F
F
0.65
0.265*
0.265* 0.265*
0.125*
0.125*
SECTION •F"
