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The DAUs and IACs will illuminate the applicable engine fire DISCH handle, flash the master WARNING lights, generate a warning message on EICAS and a FIRE indication on the applicable ITT gauge, and generate a LEFT or RIGHT ENGINE FIRE voice message.
Sensing elements are located on the following areas:
.
Accessory gear box
.
Engine core
.
Fixed cowl
ENGINE FIRE DETECTOR ELEMENTS
SENSOR ELEMENTS (3 Ea. PER ASSEMBLY)
GF0910_013
Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005
MAIN ENGINE FIRE DETECTION (CONT'D)
The detection loops of both zones are monitored as a single zone and the fire extinguishing system when discharged, supplies both zones simultaneously.
FIRE BOTTLES
FEED TO THE APU
NOTE
Discharge into RH engine is similar, but not shown.
DISCHARGE INTO FIRE ZONE
FIRE ZONE
The fire extinguishing for the main engine is supplied by two discharges (shots) of extinguishant, which can be independently directed by pilot’s selection, to either main power plant. The extinguishing piping from the bottles extend through the pylon to the engine. The piping is then directed within the engine to a tee which divides the flow into two zones, accessory and core. A nozzle assembly directs halon to different sections of each zone.
GF0910_014
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
MAIN ENGINE FIDEEX CONTROL
The FIDEEX control unit monitors the engine fire detecting elements. It sends information to the flight compartment and commands the fire bottle to discharge the extinguishing agent.
When an engine DISCH fire handle is pulled, the ENGINE SOV is commanded closed preventing fuel flow to the engine.
NOTE
Pulling the fire DISCH handle does not command an immediate engine shut down. In the event of a fire, the engine should be shut down using the ENGINE RUN switches.
When the engine DISCH fire handle is turned, a command is sent to the FIDEEX control unit to discharge the fire bottle. The EICAS will display the result of the extinguisher discharge.
Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005
MAIN ENGINE FIDEEX CONTROL (CONT'D)
When an engine fire is detected, the applicable engine fire DISCH handle will illuminate, MASTER WARNING lights flash, a warning message will appear on EICAS and a voice message “LEFT or RIGHT ENGINE FIRE”will sound.
ENGINE FIDEEX CONTROL SCHEMATIC
LEFT ENGINE
FIXED COWL MOUNTED FIRE DETECT
GEARBOX MOUNTED FIRE DETECT
CORE ENGINE FIRE DETECTOR SENSOR
RIGHT ENGINE
FIXED COWL MOUNTED FIRE DETECT
GEARBOX MOUNTED FIRE DETECT
CORE ENGINE FIRE DETECTOR SENSOR
LEFT ENGINE LOOP A
L ENGINE FIRE
LEFT ENGINE LOOP B
D A U
RIGHT ENGINE LOOP A
R ENGINE FIRE
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