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1
Bottle
APU
Enclosure
VIEW LOOKING FORWARD
P604_09_003
2
Bottle
Left
Engine
Right
Engine
Squib
(Dual Firing
Elements)
Gauge
FIRE PROTECTION
9-6 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
LH (RH) ENG FIRE PUSH Switch/Lights
The engine fire extinguishing system is controlled by the LH (RH) ENG FIRE PUSH
switch/lights.
When the LH (RH) ENG FIRE PUSH switch/light is pressed, the following occurs:
• the Firex bottle squibs are armed, both BOTTLE 1 (2) ARMED PUSH TO DISCH
switch/lights illuminate
• engine generator shuts down
• fuel shutoff valve (SOV) closes
• hydraulic shutoff valve (SOV) closes
• bleed air shutoff valve (SOV) closes
• associated engine igniters disabled
BOTTLE 1 (2) ARMED PUSH TO DISCH Switch/Lights
When an illuminated BOTTLE 1(2) ARMED PUSH TO DISCH switch/light is
pressed, electrical current fires the squibs in the associated bottle and pressurized
Halon is directed into the engine nacelle. The selection of the LH or RH ENG FIRE
PUSH switch/light will determine which engine nacelle will receive the extinguishing
agent.
Glareshield Panels
Figure 9-4
Miscellaneous Test Panel
The Engine Fire/Overheat Protection System may be tested from the Miscellaneous
Test Panel located on the forward pedestal. The FIRE DET WARN/FAIL switch
provides the means of testing the fire/overheat detection system by selectively
simulating fire/overheat conditions and fail conditions.
LH ENG
FIRE
PUSH
GPWS
TERR
INHB
MASTER
WARNING BOTTLE 1
ARMED
PUSH TO
DISCH
STALL
MASTER
CAUTION
PULL UP
GND PROX
ATS
N2 SYNC
ATS
N1 TO
FAIL
ATS
N1 TO
FAIL
APU
FIRE
PUSH
RH ENG
FIRE
PUSH
GPWS
TERR
INHB
MASTER
BOTTLE 2 WARNING
ARMED
PUSH TO
DISCH
BOTTLE
ARMED
PUSH TO
DISCH
STALL
MASTER
CAUTION
PULL UP
GND PROX
LH ENG FIRE PUSH
Switch/Light
BOTTLE 1 ARMED
PUSH TO DISCH
Switch/Light
RH ENG FIRE PUSH
Switch/Light
BOTTLE 2 ARMED
PUSH TO DISCH
Switch/Light
P604_09_009
FIRE PROTECTION
For Training Purposes Only
May 03
9-7
P I LOT T R A I N I N G GU I D E
Selecting the switch to the WARN position verifies the continuity of all the sensing
elements and bottle charge status. Selecting the switch to the FAIL position verifies
the ability of the detection control units to discriminate between an actual overheat/fire
and false fire (shorted) loops.
The FIREX MONITOR 1 (2) (APU) TEST switches provide a means for the flight
crew to test the respective squib circuitry continuity.
Miscellaneous Test Panel
Figure 9-5
TEST
TEST
TEST
TEST
TEST
WARN
TEST
FIRE DET
1 2 APU
BOTTLE
FAIL
SPS TEST
FIREX MONITOR AURAL
WARN TEST
LAMP
TEST
OVSP
TEST
1
2
ENG BOTTLE
FIREX MONITOR 1 (2) (APU)
TEST Switches
FIRE DET
WARN/FAIL
Switch
P604_09_008
FIRE PROTECTION
9-8 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Auxiliary Power Unit Fire Protection
Description
The APU fire detection system is used to detect an overheat/fire condition within the
APU enclosure. The fire detection system continuously monitors the APU. If a fire or
overheat condition is detected, the APU will automatically shut down and an EICAS
message as well as an aural and visual warning will occur. The APU fire extinguishing
system consists of one fire extinguisher bottle.
Components and Operation
Heat-Sensing Element
The APU is protected by one continuous heat-sensing element installed within the
APU enclosure. This sensing element is connected to the APU Fire Detection Control
Unit. Operation of the sensing element is identical to the engine fire detection system.
APU Fire Detection
Figure 9-6
APU Enclosure
Sensing Element
(450°F)
APU COMPARTMENT
VIEW LOOKING FORWARD
P604_09_002
APU Enclosure
FIRE PROTECTION
For Training Purposes Only
May 03
9-9
P I LOT T R A I N I N G GU I D E
Fire Detection Control Unit
The APU has a dedicated fire detection control unit which continuously monitors the
resistance of its own loop. When the electrical resistance decreases to the warning trip
　
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