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APPENDIX A
TM 07661B-14/1
the quick-disconnect fittings (4, figure 2-7).
(5)
Insert the appropriate hose and fitting into each of the hose cart inlet couplers.
(6)
Open both nitrogen cylinder valves. The AFFF tank will pressurize in 1-2 seconds, the dry chemical
tank should pressurize within 10 seconds.
(7)
Rotate the AFFF control rod and the dry chemical control rod to full open position. The system
discharge lines will pressurize up to the twin nozzle assembly.
(8)
The remote hose reel provides 150 feet additional hose. Full flow times with 300 feet of hose will be
approximately 30 seconds longer than with 150 feet of hose. See NOTE under paragraph b above.
d.
Returning Extinguisher to Operational Ready Status. Immediately after each use, the fire extinguisher
should be returned to an operational ready or standby status. Hose line clean-out must take place immediately after the
tank has been completely or partially discharged with hoses removed from hose reel.
(1)
Close shut-off valves by turning AFFF and dry chemical control rods to closed position.
(2)
Close charge valves.
(3)
Open purge valves.
(4)
Close nitrogen cylinder valves.
(5)
Slowly open AFFF and dry chemical nozzles and allow flow until hoses have cleared. Clearing is
complete when discharge stream becomes gassy for approximately 10 seconds.
(6)
When tank has vented completely, close nozzles on handlines.
(7)
Wind hoses onto hose reel. Return nozzles to nozzle bracket.
(8)
If remote hose reel cart was used, disconnect from main unit hoses. Reconnect inlet hoses (5, figure
2-7) at rear of cart. Reconnect the twin nozzle to the fire extinguisher twin agent hose.
(9)
Replenish the AFFF and dry chemical tanks as required. See paragraph 3-10. Check the nitrogen
cylinders and replace if pressure is below required 1700 psi. See paragraph 3-10c.
(10)
Return all valves to normal or ready status. See paragraph 2-12a.
(11)
Thoroughly hose down any contaminated areas of the fire extinguisher and the surrounding area with
clean water. Use care not to float AVGAS or other fuels into areas that could become hazardous.
A 2-13. OPERATION UNDER EMERGENCY CONDITIONS. If either the AFFF or dry chemical system fails to operate
or becomes inoperative during operation, the remaining system may be used to extinguish the fire. The systems operate
completely independent of each other.
A 2-14. OPERATION UNDER UNUSUAL CONDITIONS.
a.
Operation In Extreme Cold. In freezing cold weather operations the fire extinguisher AFFF tank heater must
be
A 2-15
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