FIRE PROTECTION
AIRPLANE
OPERATIONS
MANUAL
2-07-10
Page
4
Code
01
JANUARY 21, 2002
FIRE EXTINGUISHING
Two fire extinguishing bottles for the engines and one for the APU are
installed in the airplane’s tail cone.
The extinguishing agent discharge is accomplished by braking the
extinguisher bottle’s seal through an electrically actuated cartridge in
the discharge valve.
Each engine fire extinguisher bottle contains two discharge valves, a
pressure gauge with a pressure switch and a fill/safety relief valve. The
engine bottles are cross-connected by two double check tees to
provide dual shot capability, thus one or both bottles can be discharged
into one or the other engine. The double-check tee prevents the
extinguishing agent of the remaining bottle from filling the emptied
bottle in case of a second shot of the system. The engine extinguisher
bottles are discharged by pulling and rotating the Fire Extinguishing
Handle, which is located on the overhead panel.
CAUTION: DO NOT DISCHARGE THE SAME EXTINGUISHER
BOTTLE TWICE. ACTUATING THE FIRE HANDLE INTO
AN EMPTY BOTTLE MAY CAUSE STRUCTURAL
DAMAGE TO THE BOTTLE.
The APU bottle contains only one discharge valve, a pressure gauge
with a pressure switch, and a fill/safety relief valve. It provides single
shot capability for the APU. The APU extinguisher bottle is discharged
by pressing the APU Fire Extinguishing Button, located on the
overhead panel.
A caution message is presented on the EICAS should any bottle be
discharged or be inoperative for any reason (failed cartridge, loss of
pressure, or loss of power).
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