Gentex HGU-56/P, Operation And Maintenance Instructions

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CAUTION
•
Be careful not to damage any components inside the helmet when performing Steps 18
and 19.
• Be sure to drill the helmet shell as specified in Steps 18 and 19, or delamination of the
helmet shell could result, making the helmet unserviceable.
• When performing Steps 18 and 19, hold the drill perpendicular to the helmet shell to
prevent damage to the shell and the energy-absorbing liner.
•
Use the 2x4 block of wood as specified in Steps 18 and 19 to prevent damage to the
helmet shell.
• When performing Step 19, ensure that both strikers are rotated out of the way before you
begin drilling. Do not drill through the strikers with the 3/16-inch drill bit.
18. Drill the pilot holes as follows:
a. With both sides of the MFS latched in place and the two lower striker fasteners snug,
firmly hold a 2x4 block of wood inside the helmet shell behind the drilling point.
b. Use a drill with a 1/16-inch drill bit to drill a pilot hole through the upper hole of both
strikers.
c. Continue to hold the wood block behind the drilling point, and drill the upper hole of both
strikers with a 9/64-inch drill bit.
19. Drill the final holes as follows:
a. Remove the MFS, loosen the two lower striker fasteners, and rotate both strikers out of
the way to allow access to the pilot holes drilled in Step 18.
b. Firmly hold a 2x4 block of wood inside the helmet shell behind the drilling point.
c. Using a drill with a 3/16-inch drill bit, drill through both pilot holes.
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• Wear eye-protective goggles when drilling holes in Steps 18 and 19 to prevent eye injury.
•
Use the 2x4 block of wood as described in Steps 18 and 19 to prevent hand injury.