TM 1-1520-238-23
Change 10
1-402.5
1.137.
SPECIAL INSPECTION CHECKLIST – continued
Helicopter Serial No.:
Date:
Area
No.
REQUIREMENT
EVERY
Item
Status
Special
Inspection
No.
6
42
YEARLY
MAST SUPPORT BASE CORROSION INSPECTION AND SHEAR BOLT TORQUE
CHECK.
a. Perform shear bolt/nut torque check (18 total).
(1) Apply 100 INCH-POUND tightening torque on nut (HS4133-8) (para
6.97).
(2) If washer or nut turns or moves (by use of scribe), proceed to step
(3), if not proceed to step b.
(3) If washer or nut turns, contact local Apache LAR and U. S. Army
Aviation and Missile Command (AMCOM), AMSAM-AR-EI-P-A
(AH-64), DSN 897-4925 or Commercial 265-313-4925 DATA FAX is
DSN 897-1874.
b. Remove old adhesive and sealant, under four lightening hole covers, on
top of mast support base (para 2.88).
c. Inspect upper portion of mast support base in areas around four lightening
holes for corrosion (para 1.49).
(1) Remove surface corrosion (para 1.49).
(2) Inspect for pitting (para 2.88).
(a) If no pitting is found, go to step d.
(b) If pitting is within depth values (para 2.88), go to step d.
(c) If pitting exceeds depth values (para 2.88), go to step e.
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