12-3. OPERATING PROCEDURE-Continued
Chin strap Adjustment.
The chin strap should be tightened sufficiently to provide
stability, but not so tight as to cause discomfort to the
Don helmet and attach chin strap by mating
pull-the-dot fasteners. Adjust chin strap for
snug fit. Once chin strap adjustments are
fasteners to don and remove helmet.
(1) To TIGHTEN chin strap (1), pull on free end of strap
(2) To LOOSEN
(a) Push up on double D-ring buckle (3) until rings
are in a vertical position.
(b) Grasp. free end of strap and push strap towards
rear of buckle.
(c) Pull on fabric tab (4) to lock in place.
(d) Repeat steps (a), (b) and (c) until proper
adjustment is made.