Gentex HGU-56/P, Operation And Maintenance Instructions

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9. Referring to Figure 2-50 , lower
the visors (to check centering
and nose clearance) as follows:
a. Use the left-hand knob to
move the outer visor. To use
the visor knob, brace your
thumb against the visor
track, squeeze the knob with
your forefinger, and move
the knob down or up.
b. Use the right-hand knob in
the same manner to move
the inner visor.
10. If necessary, adjust the visors as
follows:
a. Loosen the downstop locking
screws ( Figure 2-50 ); one is
located on each side of the
visor. (Loosening the screws
allows the downstop to be
raised or lowered
approximately one inch for
visor-to-mask or facial
conformance.)
b. When the desired position is
attained, tighten the screws.
11. If night vision goggles are used,
place systems in normal
operating position and check for
full operational capability in
accordance with technical
manual supplied by the goggle
manufacturer.
(Continued on next page)
31
Figure 2-50. Visor Operation
Downstop
locking screw
Ensure that the night vision system mounted on your helmet is working properly in
accordance with the appropriate technical manual prior to using it. Failure to check
the night vision goggles or to be able to see the low battery warning light when using
the night vision goggles may result in a critical loss of equipment use.