4-37. MASK TO HELMET ADJUSTMENT-CONTINUED.
e. Adjust angle of helmet mounted receiver mechanism by loosening two receiver mechanism adjusting screws (1).
Rotate fitting and receiver mechanism until mask fits properly.
f. Tighten two receiver mechanism adjustment screws to secure angular receiver adjustment.
Uncut adjustment straps shall be folded under and tacked to prevent
possible injury to eyes and face.
Before cutting and tacking adjustment straps, it is required that all
adjustments to obtain proper fit have been performed. Straps may be
folded under before tacking.
When authorized by command and when mask is issued on a temporary
basis for transporting passengers or crewmembers, or when worn for trial
fittings, straps do not require cutting.
g. Inspect tacking that secures top buckles to straps. Tacking shall indicate no wear. Tacking shall be double waxed
thread, Specification V-T-276, Type IVB, Ticket 8/4, or equal, and shall make two turns throught the strap. Thread
ends shall be tied with a surgical knot and secured with a locking knot.
h. Cut excess adjustment strap leaving not less than one inch and not more than three inches. Sear cut e strap-ends to
i. Tack per step g.
Should mask be condemned, all serviceable straps and bayonets shall be
removed and saved.
j. Replace original mask microphone cord with the microphone adapter kit, Item 4, Figure 3-1.