TM 5-4220-225-14
Table 2-1. Operator Preventive Maintenance Checks and Services.
NOTE
Within designated intervals, these checks are to be performed in the order listed.
If the equipment must be kept in continuous operation, check and service only those items that can be
checked and serviced without disturbing operation. Make the complete checks and services when the
equipment can be shut down.
B - Before
D - During
A - After
Q - Quarterly
Interval
Item
Item to be Inspected.
Equipment Will Be
No.
B
D
A
Q
Procedure
Reported Not Ready If
NOTE
Perform quarterly planned maintenance when
helmet is stowed for prolonged periods.
HELMET ASSEMBLY
1.
Exterior. Visually inspect to ensure all components
and parts are properly installed and in good
condition.
2.
Shell and Base.
a. Inspect the shell and base for dirt, corrosion,
dents, cracks or chips, and sealant deterioration.
b. Visually inspect for loose or missing base-to-shell
Inspection reveals any of the
mounting screws.
defects sighted above or
any defect that renders the
helmet inoperable.
3.
Viewport Assemblies.
a. Inspect the viewports for scratches, chips and
A scratch 1/32-inch deep
cracks. Smaller scratches do not constitute a
and more than 1-inch long
safety hazard but may obscure vision.
If on the requires replacement of
inside surface, it can be reversed and continued
viewport. If both surfaces
in use. Switching the left and right viewports will
are marred so that vision is
reverse these surfaces.
obscured, replace the view-
port. If the viewport is
cracked or chipped any-
where, replace it.
2-5
