OPERATIONS MANUAL

Fire Protection
Overhead Panel:
Engine fire switch
Push Normal engine operation is enabled.
Pull (possible only when the override switch is
pushed, or the red fire light is activated, or
the fuel control switch is in CUTOFF)
• Closes the engine spar and fuel valves.
• Closes the engine bleed air PRSOV.
• Opens the IDG generator field.
• Opens the generator control breaker.
• Shuts off hydraulic fluid to the EDP.
• Arms the fire extinguisher squibs.
• Silences the fire bell.
Rotate (springloaded to halfway-deflection) Ignites
the squib to open the fire extinguisher
bottle. The fire switch must be fully deflected
into the A or B direction and held for circa
one second. Once the A or B bottle is open,
the bottle will automatically discharge all its
content into the engine.
1,2,3,4
LIGHT
A fire is detected in the engine, or the
engine fire detection test is running and the
detector is operative.
Engine specific bottle systems:
GE & PW engines:
2 bottles per wing
RR engines:
2 bottles per engine
Bottle discharged light
Illuminates when the fire
extinguisher bottle is empty.
Override switch
Push & hold
(momentary action) Overrides the
interlock behind the fire switch to allow
the fire switch to be pulled. The interlock is
removed automatically by a solenoid when
the red fire light is activated, or when the
fuel control switch is in CUTOFF.
(In the simulator, when the override switch
is clicked with the mouse, the simulator
will keep the override switch pushed for
2 seconds to allow the mouse to move on
and click on the fire switch.)
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