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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
point, the unit produces a fire warning signal to the EICAS which causes the following
aural and visual warnings to occur:
• APU FIRE warning EICAS message is displayed
• MASTER WARNING switch/lights illuminate flashing
• fire bell sounds
• APU FIRE PUSH switch/light illuminates
The APU will also shut down automatically.
The aural warnings can be silenced by pressing either MASTER WARNING switch/
light. However, the EICAS warning message will remain displayed and APU FIRE
PUSH switch/light will remain illuminated until the fire/overheat condition is
corrected.
As with the engine fire-sensing elements, the APU fire detection control unit can
discriminate between an actual fire/overheat and a false fire (i.e., short in the sensing
element). In the event of APU fire detector loop failure, the APU FIRE FAIL caution
EICAS message will be displayed.
APU Fire Extinguishing Bottle
APU fire extinguishing is provided by one Firex bottle located adjacent to the APU
compartment in the aft equipment bay. The bottle is charged with Halon 1301 and
pressurized with dry nitrogen (600 to 625 psi).
The APU Firex bottle is equipped with a pressure gauge and a thermal discharge port
and is connected by a single tube to the APU compartment. The pressurized
extinguishing agent is discharged by a squib with dual firing cartridges, for
redundancy.
The thermal discharge port provides overpressure relief. Operation is identical to the
engine Firex bottles.
FIRE PROTECTION
9-10 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
APU FIRE PUSH Switch/Light
The APU fire extinguishing system is controlled by the APU FIRE PUSH switch/light.
When the APU FIRE PUSH switch/light is pressed, the following occurs:
• the bottle squibs are armed, APU BOTTLE ARMED PUSH TO DISCH switch/
light illuminates
• APU shuts down (if not already shut down)
• APU fuel shutoff valve (SOV) closes
• APU negative-G shutoff valve (SOV) closes
• APU LCV closes
• APU generator shuts down
APU BOTTLE ARMED PUSH TO DISCH Switch/Light
When an illuminated APU BOTTLE ARMED PUSH TO DISCH switch/light is
pressed, electrical current fires the squibs in the APU bottle and pressurized Halon is
directed into the APU enclosure.
Copilot’s Glareshield Panel
Figure 9-7
Miscellaneous Test Panel
The APU Fire Protection System is tested simultaneously with the Engine Fire
Protection System, via the Miscellaneous Test Panel. Refer to the Engine Fire and
Overheat Protection, Miscellaneous Test Panel section for additional information.
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
APU FIRE PUSH
Switch/Light
APU BOTTLE ARMED
PUSH TO DISCH
Switch/Light
P604_09_017
FIRE PROTECTION
For Training Purposes Only
May 03
9-11
P I LOT T R A I N I N G GU I D E
Baggage Compartment Fire Protection
Description
Fire protection for the baggage compartment consists of an electronic smoke detector
that interfaces with the EICAS to provide aural and visual warnings.
Components and Operation
Smoke Detector
The aircraft is equipped with a smoke detection system for the baggage compartment.
When the smoke density reaches a predetermined level, the smoke detector produces a
fire warning signal which causes the following aural and visual warnings to occur:
• SMOKE BAGGAGE BAY warning EICAS message is displayed
• MASTER WARNING switch/lights illuminate flashing
• “SMOKE” aural warning sounds
The aural warning can be silenced by pressing either MASTER WARNING switch/
light. However, the EICAS warning message will remain displayed until the unit resets
itself.
Smoke Detector Test
The baggage compartment smoke detector can be tested by the pushing in and holding
the SMK DET test button located on the ANNUNCIATOR Panel.
Smoke Detector Test Button
Figure 9-8
ANNUNCIATOR PANEL
P604_09_010
RESET
CALL SMK
LAV CAB
FIRE PROTECTION
9-12 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Lavatory Fire Protection
Description
　
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