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of its loop. When the electrical resistance decreases to the warning trip point, the fire detection
control unit prompts EICAS messages, as well as aural and visual warnings, to alert the flight
crew of a fire and/or overheat condition.
For Zone A, the fire warning signal causes the following aural and visual warnings to occur:
• L (R) ENG FIRE warning EICAS message is displayed
• MASTER WARNING switch/lights illuminate flashing
• Applicable red LH (RH) FIRE PUSH switch/light illuminates
• Fire bell sounds
For Zone B, the fire warning signal causes the following aural and visual warnings to occur:
• L (R) JETPIPE OVHT warning EICAS message is displayed
• MASTER WARNING switch/lights illuminate flashing
• “JETPIPE OVERHEAT” aural warning sounds
The aural warnings can be silenced by pressing either MASTER WARNING switch/light. The
EICAS warning message will remain displayed, and the ENG FIRE PUSH switch/light will
remain illuminated, until the fire/overheat condition is corrected.
The fire detection control units can discriminate between a true fire/overheat and a short in the
heat sensing element. In the event of fire detector loop failure, the applicable L (R) FIRE FAIL or
L (R) JETPIPE OVERHEAT FAIL caution EICAS message will be displayed.
Engine Fire Extinguisher Bottles
Two engine Firex bottles are installed in the aft equipment bay under the APU enclosure. The
bottles are charged with Halon 1301 and pressurized with dry nitrogen (600 to 625 psi).
Each bottle is equipped with a left and right squib (electrically actuated discharge cartridges),
thermal discharge port, pressure gauge, and a left and right discharge line. The discharge lines
are interconnected to allow discharge of both bottles (if needed) into one engine. The selection
of the LH or RH ENG FIRE PUSH switch/light will determine which squibs are fired.
The thermal discharge port provides overpressure relief for each Firex bottle. Should the
pressure in a Firex bottle exceed 1,400 psi, the thermal discharge port will discharge the
extinguishing agent in the immediate vicinity of the bottle.
FIRE PROTECTION
Description
Vol. 2 09−10−3
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
ENGINE FIRE/OVERHEAT PROTECTION (CONT'D)
Engine and APU Fire Extinguishing System
Figure 09−10−3
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
FIRE PROTECTION
Description
Vol. 2 09−10−4
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
ENGINE FIRE/OVERHEAT PROTECTION (CONT'D)
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
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
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
　
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