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TM 07661B-14/1
APPENDIX A
A 3-41. TWIN AGENT HOSE ASSEMBLY.
a.
Emergency Repair. Maintenance and emergency repair of twin handlines will normally be accomplished by first
and second echelon maintenance personnel and are included in paragraph 3-24.
b.
Installation of Hose End Fittings. A special tool (figure 3-1) is required for installation of hose fittings. Refer to
figure 3-26 and proceed as follows:
NOTE
When replacing a damaged fitting on one hose, be sure hoses are identical length to assure
proper installation to hose reel or nozzle.
(1)
When removing damaged fitting for replacement, cut fitting from hose as near to fitting as possible.
(2)
Trim hose end neatly, keeping end square. Pull a 1/4-inch length of grounding wire through hose cover
and fold back over hose cover.
(3)
Install ferrule onto hose, turning hose counter-clockwise until it bottoms against ferrule. Refer to (A), figure
326.
(4)
Insert tool (b, figure 3-26) into coupling. Apply grease to taper end of coupling. Insert coupling into ferrule
and tighten with clockwise motion (C) until coupling is bottomed against ferrule.
(5)
Perform leak test (to 340 psi).
(6)
Check for electrical continuity from coupling to coupling on each hose to ensure integrity of grounding wire.
NOTE
Twin agent hoses are internally grounded by a wire which is integral with the hose. If a hose
or a section of hose being replaced in an emergency or otherwise, by a hose which is not
internally grounded, an external ground wire should be installed to ensure operator protection
against static shocks. See paragraph 3-24.
A 3-42. AFFF TANK HEATER
a.
Testing
(1)
Heater does not function below 40°F.
(a)
Unplug the power cord from its receptacle
(b)
Remove the enclosure (figure 3-28) and bypass the thermostats by connecting a jumper wire
between the power cord and the heater wires. Refer to figure 3-27.
(c)
Plug in the power cord to its receptacle. If heater does not function the problem lies in the heater
blankets. Replace heater blankets. If heaters function the problem is in the thermostats.
(2)
Testing thermostats.
(a)
If ambient temperature is below 40oF the thermostats can be tested on the fire extinguisher. With
the power cord plugged into its receptacle, connect a voltmeter across the wire leads of each of the thermostats. Line
voltage indicates that the thermostat contacts are not closing and the thermostat is faulty. Replace thermostat.
A 3-56
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