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ANNUAL INSPECTION AND MAINTENANCE CHECKLIST (continued)
STEPS
FREE FLOW / WATER DUMP VALVE AND DEFOGGER
NOTE: Refer to the free flow / water dump valve and defogger section of the
Operations and Maintenance Manual for guidance.
FREE FLOW / WATER
DUMP VALVE BODY
WATER DUMP EXHAUST
FLAPPER VALVES
O-RINGS (3)
COPPER WASHERS (2)
VALVE SEAT
FREE FLOW / WATER
DUMP VALVE STEM
PROCEDURE
•
Remove the free flow / water dump valve from
the helmet shell. Disassemble fully and visually
inspect all parts for damage. Clean as required.
•
Visually inspect for cuts and damage. Wash with
soap and water, rinse with fresh water and allow
to dry. If necessary, replace water dump / exhaust
flapper valve.
NOTE: The flapper valves have a long
service life and are not normally replaced
annually.
•
Replace all o-rings (3) annually.
•
Replace both copper washers annually.
•
Visually inspect and check nylon seat condition.
•
If necessary, replace entire free flow / water dump
valve seat.
•
Visually inspect for damage, bends and thread
condition.
•
If necessary, replace with new valve stem.
57
INITIALS
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