TM 1-1520-238-23
1-402.4
Change 10
1.137.
SPECIAL INSPECTION CHECKLIST – continued
Helicopter Serial No.:
Date:
Area
No.
REQUIREMENT
EVERY
Item
Status
Special
Inspection
No.
4
41A
(cont)
NOTE
(cont)
When checking for cracks pay special attention to left forward mount
areas adjacent to where the two mounting bolts are installed.
c. Check four elastomeric mounts for cracks. Use 10-power magnifier.
(1) If cracks are suspected, perform nondestructive inspection
(TM 1-1520-264-23).
(2) If crack is found, replace mount.
(3) Submit a CAT I Deficiency Report.
d. Check four elastomeric mounts for distortion, corrosion, and dirt. Use
10-power magnifier.
e. Check four elastomeric mounts for exposed bare metal on visible edge of
rubber sandwiched in mount.
(1) If bare metal is found, touchup bare metal (para 1.49).
f. Install drain cavity debris shield on elastomeric mount.
(1) Install debris shield on elastomeric mount.
(a) Install two screws through retaining clip, debris shield, and mount.
(b) Apply petrolatum jelly to expose surface of shields. Use petrolatum
(item 138, App F).
g. Check outboard visible edge of rubber sandwiched in elastomeric mounts
for gaps and voids.
(1) Inspect rubber for gaps or voids of 0.2 INCH or greater. If gaps or
voids exceed limits replace mount.
(2) Inspect rubber for gaps or voids totaling 0.5 INCH or greater. If gaps
or voids exceed limits replace mount.
(3) Inspect rubber for gaps or voids more than 1/8 INCH deep below
metal edge. If gaps or voids exceed limits replace mount.
h. Install fairings R545 and L545 (para 2.2).
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