f. Reinstall the TPL as in Replacement Procedure 1, Step 7 (Page 14).
g. Have the crewmember don the helmet and fasten the chinstrap. If the
ears are now centered in the earcups, remove and store the helmet as
required. If not, readjust the retention straps as necessary until the ears
are centered in the earcups.
Adjustment #2: Earcup Compression
1. If the earseals are not sufficiently
compressed, doff the helmet and
tighten the helmet cross straps. Two
cross straps are located behind each
earcup; each cross strap has a loop.
To tighten each cross strap, insert a
finger into the loop and move the loop
toward the bottom of the shell. (See
Figure 10.) Don the helmet, tighten
the chinstrap, and recheck the earseal
compression.
2. If the earseals are not sufficiently compressed after the cross straps have
been tightened, doff the helmet and add earcup spacer pads behind each
earcup as required. The earcup spacer pad set supplied with each helmet
consists of four pads (two ½" thick and two 1/4" thick) and pressure-sensitive
pile fastener. Install the pads as follows:
a. Peel the backing from one pressure-sensitive pile fastener and apply the
adhesive side of the fastener directly to the back of one earcup. Repeat
for the other earcup.
NOTE
Spacer pads may be installed whole or cut to any size or shape
needed to increase or balance earcup compression. See
Figure 11 for examples.
9
Figure 10. Cross Straps
CROSS
STRAPS
Figure 11. Earcup Spacer Pad Uses
INCREASE
OVERALL
PRESSURE
BALANCE TOP OR
BOTTOM PRESSURE
BALANCE FRONT
OR REAR PRESSURE
BALANCE TOP/BOTTOM OR
FRONT/REAR PRESSURE
BALANCE CORNER
PRESSURE
(Continued on next page)
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