OPERATIONS MANUAL

Fire Protection
Fire and Overheat Test:
Test systems are engine model specific.
Fire/overheat test switch
(GE & PW engines)
Push & hold
(momentary action) Initiates fire and overheat signals to
test the detectors of the APU, bleed duct, cargo, engine, and
wheel well systems. Checks the aural and visual alerts on the
flight deck.
Engine fire/overheat test switch
(RR engines)
Push & hold
(momentary action) Initiates fire and overheat signals to test
the engine turbine overheat detectors. Checks the aural and
visual alerts on the flight deck.
Engine, APU, cargo fire/overheat test switch
(RR engines)
Push & hold
(momentary action) Initiates fire and overheat signals to test
the overheat detectors in the bleed ducts and engine struts
and cowls, and to test the fire detectors on the engines, in the
APU, the wheel wells, and cargo compartments. Checks the
aural and visual alerts on the flight deck.
Fuel control switch fire light
Indicates a fire is detected in
the engine, or the engine fire
detection test is running and
the detector is operative.
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