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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 (loop) 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 09−10−6
FIRE PROTECTION
Description
Vol. 2 09−10−6
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
AUXILIARY POWER UNIT FIRE PROTECTION (CONT'D)
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 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 the 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 an 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.
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
FIRE PROTECTION
Description
Vol. 2 09−10−7
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
AUXILIARY POWER UNIT FIRE PROTECTION (CONT'D)
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 09−10−7
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/Overheat Protection, Miscellaneous
Test Panel section for additional information.
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.
FIRE PROTECTION
Description
Vol. 2 09−10−8
REV 66, Feb 01/07
CL−604 Operating Manual
　
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