14
Chapter 2: Helmet Preparation and Operation
20. With the helmet still
on the pilot's head,
remove the plastic
sheeting from behind
the earcups.
21. If the chin strap is
too long after it is
adjusted, mark a
trim line at the end
of the chin strap
approximately
2 inches (5 cm)
from the edge
as shown in
22. If you marked the chin strap (Step 21), trim the chin strap as follows:
d. Unsnap the chin strap; have the aircrew member remove the helmet.
e. Unlace the other end of the chin strap from the buckle.
f. Note the orientation of the chin pad, and remove the chin pad from the chin strap.
g. Cut the strap at the trim line.
h. Sear the cut edge to prevent the strap from unraveling.
i. Fold the cut end of the chin strap under (doubled 1/4 inch, or 6mm) and stitch the fold
using thread (waxed black MIL-T-83193), 10 to 12 stitches per inch (2.54 cm).
j. Replace the hook fastener (
) with 1 inch (2.54 cm) of hook fastener (NSN
8315-01-445-8812) using thread (MIL-T-83193), 10 to 12 stitches per inch (2.54 cm).
k. Slide the chin pad onto the chin strap, ensuring that it is oriented correctly.
l. Lace the chin strap through the buckle.
2 in. (5 cm)
Trim line
ENLARGED VIEW,
END OF CHIN STRAP
Trim line
1 in. (2.54 cm)
hook fastener
Figure 2-12. Marking Trim Line on Chin Strap
Figure 2-13. Trimming Chin Strap
