4-34. INSTALLATION OF RECEIVER MECHANISM ASSEMBLIES.
Use the following procedures to accomplish the installation of receiver mechanism assemblies.
a. Remove four screws (1 and 2), lock-
washers (3), and backplate (4) from
both receiver mechanisms (5).
Perform following procedures on both
sides of the helmet unless otherwise
b. Draw visible reference line (6) from
front ear cup tension-strap screw
(7), to rear tension-strap screw (8).
c. Center receiver mechanism (5) on
step (b) reference line, 1/4 inch rear-
ward of front tension strap screw
(7). Hold centered receiver
mechanism firmly against helmet
and CAREFULLY trace around
mechanism and mark four attach-
ment hole locations (9) using a lead
Recheck accuracy of attachment hole
locations before proceeding to step (d).