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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 09−10−4
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.
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 09−10−5
FIRE PROTECTION
Description
Vol. 2 09−10−5
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
AUXILIARY POWER UNIT FIRE/OVERHEAT 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 Elements
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
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
AUXILIARY POWER UNIT FIRE/OVERHEAT 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; and
• 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 condition 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; and
• APU generator shuts down.
FIRE PROTECTION
Description
　
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