TM 9-3990-260-14&P
Table 4-1. Unit Maintenance Preventive Maintenance Checks and Services - Continued
Location
Item
Interval
Procedure
Not Fully Mission
Item to
No.
Capable If:
Check/Service
3
Semi-
Bracing
d. Ensure each securing pin can be
d. Cam securing pin
(Cont)
Annually
Mechanisms
inserted through its cam and cam can be hole is deformed or pin
properly secured.
cannot otherwise be
inserted through cam
and properly secured.
4
Semi-
Visually inspect twistlocks to ensure:
M3 CROP
Annually
Twistlocks
a. Shaft is broken.
a. The shaft (10) is straight and not
cracked or broken.
b. Handle is missing.
b. Handle (11) is securely fastened to
shaft.
c. Shear pin is miss-
c. Shear pin (12) is secure.
ing.
d. Head is broken,
d. Head (13) is not broken or cracked.
cracked or missing.
e. Twistlock can be locked and
e. Twistlock cannot be
locked or unlocked by
unlocked correctly without undue diffi-
hand.
culty.
f. No crack greater than 3/4 inch (19
f. Twist lock housing
mm) exists in the welds or parent mate-
welds or parent material
rial of the twistlock housing.
contains a crack greater
.than 3/4 inch (19 mm).
4-8
