Gentex HGU-56/P, Operation And Maintenance Instructions

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5. Adjust the earcups so that they cover
the wearer’s ears. Ask the wearer if
the ear is centered in the earcup.
NOTE: Earseals ( Figure 2-45 ) should
be compressed evenly and to the
greatest degree possible without
causing discomfort. (Proper earseal
compression may be indicated by a
visible ring impression around the ear
when the helmet is removed. If no ring
is visible, check carefully to see that
none of the ear is pinched under the
earseal.)
6. Check the earseal compression. As
necessary, refer to Figure 2-46 and
Figure 2-47 and do any of the
following:
• If earseal compression is too great
(causing discomfort)
without earcup
spacer pads, select the next larger
helmet size.
•
If the earseals are not sufficiently
compressed, have the wearer remove
the helmet. Add one or more earcup
spacer pads (
Figure 2-46 ) as needed
between the earcup retaining pad and
the helmet shell (NOT between the
earcup and the retaining pad). Then
have the wearer don the helmet;
recheck earseal compression.
NOTE: Earcup spacer pads
may be installed whole, cut in half
horizontally to adjust up/down earcup
tilt, cut in half vertically to adjust
forward/rearward earcup tilt, or
trimmed in any other manner that will
achieve proper earseal compression.
(See
Figure 2-47 for examples.) You
may have to try various combinations
of pads to achieve proper
compression.
Continued on next page
29
Figure 2-47. Spacer Pad Trimming
Figure 2-45. Earseal
Earseal
Figure 2-46. Placement of
Spacer Pad
Earcup
spacer pad
Helmet shell
Earcup
Earcup
retaining pad