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APPENDIX A
TM 07661B-14/1
Table A 3-1. Preventative Maintenance Services
FREQUENCY
MAINTENANCE CHECK
CRITERIA
Bi-Annually
Annually
X
HIGH PRESSURE LEAK TEST.
1. Close all AFFF and dry
chemical system shutoff
valves.
2. Open Nitrogen
cylinder valves.
3. Check all fittings,
connections and hoses,
from nitrogen cylinders
to pressure regulators,
for leaks. Use soap
No evidence of leaks
solution.
for five minutes.
X
Check pressure relief
valves for obstructions.
X
Remove fill caps and
check that pressure
relief holes in fill
collars are free of
obstructions.
X
Examine fill cap gaskets
for elasticity, clean and
coat lightly with a good
Replace gaskets if
grade of heat resistant
brittle, cut, cracked
grease.
or deformed.
X
Inspect threads in fill
caps and on fill openings
for nicks, cross-thread-
ing and rough edges.
X
Using soap and water,
thoroughly clean the
equipment to remove all
traces of dirt and
chemicals.
X
Check for signs of cor-
rosion or other physical
damage. If necessary,
scrape and repaint the
unit.
A 3-3
APPENDIX A
TM 07661B-14/1
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