Gentex HGU-56/P, Operation And Maintenance Instructions

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14. If the MFS is used, refer to Figure 2-53 and check operation as follows:
a. To attach the MFS, position the pin on one side of the MFS into the slot of the striker,
and flip the latch against the helmet shell. Ensure that the latch is locked in place.
Repeat for the other side.
b. Adjust the microphone
boom as necessary so that
it can be placed behind the
MFS. To do this, loosen
the swivel, move the boom
forward or back until it can
be placed under the
recessed area of the MFS,
and tighten the swivel.
c. If night vision goggles are
used, remove the lens
caps and lower the night
vision goggles. If the
goggles clear the MFS and
are properly positioned
over the eyes, no trimming
is needed. If the goggles
contact the shield, trim the
shield as specified in
Paragraph 2-5 (Page 35).
d. To remove the MFS, flip
the latch on one side of the
MFS away from the helmet
shell, and remove the pin
from the slot. Repeat for
the other side.
NOTES:
• The helmet can be donned or doffed while the MFS is attached to either side and swung
open. However, if the ML-24 light (from Seitz Scientific Industries, Inc.) is attached, the
MFS should be swung open from the right side as worn to avoid disconnecting the light.
•
The MFS can also be swung open while the helmet is worn, allowing the crewmember to
eat or drink.
•
If the helmet is stowed with the MFS attached, the shield should be secured to the helmet
on both sides.
(Continued on next page)
33
Figure 2-53. Operating MFS
Striker
(on helmet)
Latch
(on MFS)
Pin
Night vision
goggles
MFS
Microphone
(inside MFS)
Slot
Swivel
Boom