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APPENDIX A
TM 07661B-14/1
Section IV. TROUBLESHOOTING
A 3-5. GENERAL. This section provides information for troubleshooting the fire extinguisher and includes indication of
trouble, determination of cause, and the remedial action necessary for repair or adjustments.
A 3-6. TROUBLE-SHOOTING PROCEDURES. A trouble-shooting chart is provided in table 3-2, and is intended as a
guide to isolate malfunctions to certain areas or components. For each symptom one or more probable causes and
possible remedies are listed. An asterisk by an item in the remedy column indicates that necessary repairs are beyond
operator capability. The operator will call in maintenance personnel from the applicable maintenance echelon to perform
those tasks.
Table A 3-2. Trouble-Shooting Chart
SYMPTOM
PROBABLE CAUSE
POSSIBLE REMEDY
DRY CHEMICAL SYSTEM
NITROGEN CYLINDER
Low temperature.
Check the Nitrogen cyl-
GAGE INDICATES LOSS
inder gage indication and
OF PRESSURE, CYLIN-
ambient temperature against
DER VALVE CLOSED.
table 3-4.
Nitrogen cylinder
Adjust per paragraph 3-llb.
valve leaking.
If leakage continues with
cylinder valve closed,
replace cylinder.
Leakage in gage
With valve closed, check
or fittings.
high pressure gage and
fittings with soap solu-
tion. Tighten or replace
as necessary.*
AUDIBLE INDICATION
Leakage in system
Leakage with system pres-
OF NITROGEN CYLIN-
lines, tank filler
surized will normally be
DER DISCHARGE, SYS-
cap, or relief
immediately evident and
TEM FULLY CHARGED,
valve.
easily located. Repair or
NOZZLE CLOSED.
replace faulty component.*
DECREASED FLOW OF
Plugged pickup
Depressurize system and
DRY CHEMICAL AGENT.
tube.
examine dry chemical pow-
der. If powder is damp or
caked, replace.
A 3-5
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