TM 10-8415-206-12&P
4-34. INSTALLATION OF RECEIVER MECHANISM ASSEMBLIES -CONTINUED
d. Using a NO. 25 (0.1495" dia.) drill
bit, drill four mounting holes on
each side of helmet shell (eight
holes total). Keep drill bit perpen-
dicular to helmet surface. Deburr
mounting holes.
NOTE
Remove earcup chafing pads before
proceeding to step (e).
e. Align backplate (4) with step (d)
mounting holes on inside of helmet
shell. Align receiver mechanism (5)
with mounting holes on outside of
helmet.
f. Install four screw (1 and 2) and lock-
washers (3) removed in step (a)
using two longer screws in front
mounting holes. Tighten screws in
sequence to assure complete seal
between receiver mechanism and
helmet shell.
g. Install new foam earcup chafing
pads to replace pads removed after
step (d).
Change 5
4-137
