Gentex HGU-56/P, Operation And Maintenance Instructions

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6. Inspect the energy-
absorbing liner in
accordance with Table 3-1;
replace if necessary
following 3-3.1.
7. Referring to Figure 3-11 ,
remove the remaining two
pan-head screws, spring
washers, and posts
attaching the retention
assembly to each side of
the helmet shell.
8. Remove the entire
retention assembly from
the helmet.
Installation
1. Attach the retention assembly to the helmet shell by installing four screws, washers, and
posts at the attachment points indicated in Removal step 7.
2. Position the front edge of the energy-absorbing liner between the nape strap pad and the
helmet shell at the rear of the helmet. Following the contour of the helmet shell, slide the
liner into the helmet until the front edge of the liner is flush with the front edge of the helmet
shell. Ensure that the hook-and-pile fasteners are engaged.
NOTE: Ensure that the holes in the energy-absorbing liner align with the plenum
openings for air cooling. In addition, the square hole should be located to allow access
to the retention assembly mounting hardware.
3. Reinstall the screw, washer, and post removed in Removal step 3.
4. Squeezing the sides of the TPL (or SCL), reinstall it in the helmet with the rear edge aligned
with the top edge of the nape strap pad. Ensure that the nape hanger strap is taut and the
hook-and-pile fasteners are engaged.
5. Reinstall the earcups.
6. Check the fit of the helmet per Paragraph 2-4, beginning on Page 27.
52
Figure 3-11. Retention Assembly Attachment Points
Screws