hydrocarbon fuel fire is detected. Should a large fire occur in the
crew compartment, the SCEA will activate the FIRE ALARM lamp on the
crew compartment T/A panel and automatically activates two fire
extinguishers on vehicles 1 through 344 and three fire extinguishers
on vehicles 345 and above. Should the existing fire continue or a
second fire occur, the SCEA will activate the remaining crew fire
extinguishers. When OFSA detects a small fuel fire, a signal from
the SCEA causes the FIRE ALARM lamp on the T/A panel to flicker.
The crew may then use a portable fire extinguisher or activate the
red-guarded MANUAL DISCHARGE toggle switch on the T/A panel to
extinguish the small fire.
Built-in test equipment is also
incorporated in the SCEA and is used to internally test the unit for
normal operation.
A fault in the SCEA will be indicated by
illumination of a LED on the T/A panel (see Figure 7).
Figure 7.
Optical Fire Sensing Assembly and Standard
Control Electronic Amplifier.
o
Fire Extinguishers.
The crew AFES fire extinguishers, like the
engine AFES fire extinguishers, are also constructed of steel. They
are equipped with a quick-release valve, filled with Halon 1301 fire
suppressant and pressurized with dry nitrogen for use on hydrocarbon
fuel fires only. The crew AFES of vehicles 1 through 344 have four
10-pound automatic fire extinguishers and vehicles 345 and above are
equipped with six 7-pound automatic fire extinguishers. The crew
9
OD1700
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