Gentex HGU-56/P, Operation And Maintenance Instructions

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TABLE 3-1. PREVENTIVE MAINTENANCE CHECKS AND SERVICES
B - Before (pre-flight) A - After (post-flight) C - Every 120 calendar days
ITEM
NO. INTERVAL
B A C ITEM TO BE INSPECTED/
PROCEDURE NOT FULLY MISSION CAPABLE IF:
1.
2.
3.
x x x
x x x
x x x
x x x
x x x
x x x
x x x
x x x
x
x x x
Helmet shell.
WARNING
Do not repair or use any helmet that is
damaged beyond the limits set forth in
this PMCS chart. Injury or death may
result if you do.
Inspect surface for chipped paint with
penetration of fibers.
Inspect surface for delaminations larger
than an nickel, or cracks that are forked
or branched.
Inspect surface for cracks, running front
to back, measuring longer than 2 inches,
or penetrating the light-colored inner
fiber layers.
Inspect surface for cracks, running side
to side, measuring 1 inch or longer, or
penetrating the light-colored inner fibers.
Inspect the edge for cracks.
Inspect the eardome area for holes or
cracks.
TPL or SCL.
Check fit.
Inspect plastic layers for attachment.
Check for cover for dirt.
Energy-absorbing liner.
Check for holes and cracks.
Surface has chipped paint with
penetration of fibers.
Surface has delaminations larger than a
nickel, or cracks that are forked or
branched.
Surface has cracks, running front to back,
measuring longer than 2 inches, or
penetrating the light-colored inner fiber
layers.
Surface has cracks, running side to side,
measuring 1 inch or longer, or penetrating
the light-colored inner fiber layers.
Edge has any cracks.
Any cracks penetrate all fiber layers, or
any holes exist in the eardome area.
Loose fit or improperly fitted.
Plastic layers have one or more plies that
have been separated from the stack.
Cover is greasy, oily, or dirty.
Energy-absorbing liner has holes or
compressions, gouges deeper than 1/4"
cracks in front, or cracks wider than ½" in
rear.
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