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
A fault in the SCEA will be indicated by
Optical Fire Sensing Assembly and Standard
Control Electronic Amplifier.
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