f. Installing Oxygen Mask Bayonet Receivers.
General Safety Instructions
Punch, center, solid (GGG-P-831 TY2CLASZ5)
File, hand (GGG-F-325 TY16CL1STA)
Screwdriver, cross-tip (GGG-S-121 TY6CL1)
Screwdriver, cross-tip (GGG-S-121 TY1CL5)
Rule, steel, machinists (430C)
Drill, electric (SP6039)
Bit, high-speed, #27 (DBE27A)
Chinstrap must be adjusted securely under
the operator/wearers chin at all times
when the helmet is worn. DO NOT allow
the oxygen mask to be placed between
the strap and the operator/wearers chin;
warn the operator/wearer not to fasten the
chinstrap over the oxygen mask. Failure
to heed this warning will result in a loss
of helmet stability and may cause injury
to the operator/wearer.
Hardware, Mech. Kit (1680-ALSE-239-1)
or Personnel with ASI of
H2/Q2 (ALSE Qualified)
Wear safety goggles (Item 10, Appendix E)
when drilling the helmet shell.
Before beginning this procedure, ensure that the strap assembly, chin
has been adjusted for proper helmet fit.
1. Referring to Figure 4-59, loop two oxygen mask straps through each bayonet
assembly. Adjust each strap to its midpoint; this will allow for tightening and
2. Have operator/wearer don helmet and fasten/adjust chinstrap securely.
3. Insert left (as worn) bayonet through the corresponding receiver (shown in
Figure 4-62) to the second click. Ensure that the lettered side of the receiver is
positioned toward the helmet.
4. Have the operator/wearer hold mask against his or her face so that it fits
5. Lower the visor lens, and check for interference with the oxygen mask straps. If
interference occurs, adjust visor using visor downstop locking screws in
accordance with paragraph 4-13h.