TM 5-4220-225-14
4-29. Helmet Ducts.
This task covers:
a. Replace (Supply Duct)
b. Replace (Return Duct)
INITIAL SETUP
Materials/Parts
Materials/Parts (Cont)
Wrap, Nylon Tie (Item 28, Appendix B)
RTV Sealant (Item 1, Appendix E)
Left Return Duct
Tape, Hook and Eye
Right Return Duct
Connector
Equipment Condition
Connector
Supply Duct
Helmet liner removed (para. 4-28).
Helmet Weight
a. Replace (Supply DucO. (figure 4-31)
(1)
Remove supply duct (1), tie wraps, and connector (2).
(2)
Ensure mounting surface on inside of helmet (3) is clean.
(3)
Apply adhesive to mounting surface of connector (2) and supply duct (1).
(4)
Install connector (2), supply duct (1), and tie wrap.
(5)
Install hook and eye tape (4) to supply duct (1) and secure with adhesive.
FOLLOW-ON MAINTENANCE
Install helmet liner (para. 4-28).
4-76
