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APPENDIX A
TM 07661B-14/1
Table A 3-2. Trouble-Shooting Chart (Continued)
SYMPTOM
PROBABLE CAUSE
POSSIBLE REMEDY
DECREASED FLOW OF
Plugged pickup
Close charge valve,
DRY CHEMICAL
tube.
open purge valve
AGENT.
and dry chemical
valve, then open
nitrogen cylinder
valve to clear
pickup tube.
Return valves to
normal operating
position.
Packed handline
Clear hose per paragraph
hose resulting in
3-28.
incomplete
clean-out.
Partially closed
Open valve completely.
dry chemical
valve.
Defective regu-
Check system operating
lator.
pressure. Must be within
220-240 psi. See para-
graph 3-11.
Low charge on
Replace cylinder.
Nitrogen cylinder.
AFFF SYSTEM
See probable
NITROGEN CYLINDER
causes and possi-
GAGE INDICATES
ble remedies for
PRESSURE LOSS
same symptom in
DRY CHEMICAL
SYSTEM.
DECREASED FLOW OF
AFFF valve par-
Open AFFF valve fully.
AFFF AGENT.
tially closed.
Low system pres-
Check that system pres-
sure.
sure is within limits
220-240 psi.
Defective pres-
Replace regulator. See
sure regulator.
Paragraph 3-17.
NO AFFF DISCHARGE
Shutoff valve
Check system valves are
WHEN NOZZLE IS
is closed.
in normal operating
OPEN, SYSTEM
position.
PRESSURIZED.
A 3-6
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