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FIRE PROTECTION
Description
Vol. 2 09−10−11
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
MAIN LANDING GEAR BAY OVERHEAT DETECTION SYSTEM (CONT'D)
Overheat Detection Control Unit
The overheat detection control unit continuously monitors the loop resistance of the sensing
element (loop). When the electrical resistance decreases to the warning trip point, the unit
produces an overheat warning signal to the EICAS, which causes the following aural and visual
warnings to occur:
• MLG BAY OVHT warning EICAS message is displayed
• MASTER WARNING switch/lights illuminate flashing
• “GEAR BAY OVERHEAT” aural warning sounds
The overheat detection control unit can discriminate between an actual overheat and a false
overheat (i.e., short in the sensing element). In the event of main landing gear overheat detector
failure, the MLG BAY OVHT FAIL caution EICAS message will be displayed.
MLG BAY Overheat Test
The MLG BAY overheat detection system can be tested from the LDG GEAR CONTROL panel,
located on the center forward pedestal. The OVHT test switch is used to verify the continuity of
the heat-sensing element, by simulating an overheat/fire condition. The FAIL test switch is used
to verify the ability of the detection control unit to discriminate between an actual overheat/fire
and false overheat/fire (shorted) loop.
Landing Gear Control Panel
Figure 09−10−10
CONTROLS AND INDICATORS
General
The controls for the various fire protection systems are located on the glareshield; the systems
advisory, caution and warning messages are displayed on EICAS, and the test switches are
located on the MISCELLANEOUS TEST panel and LDG GEAR control panel.
FIRE PROTECTION
Description
Vol. 2 09−10−12
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
CONTROLS AND INDICATORS (CONT'D)
Engine and APU Fire/Overheat Protection
Glareshield Panels
Figure 09−10−11
FIRE PROTECTION
Description
Vol. 2 09−10−13
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
CONTROLS AND INDICATORS (CONT'D)
Fire Detection and FIREX Monitor Test
Miscellaneous Test Panel
Figure 09−10−12
MLG Bay Overheat Test
Landing Gear Control Panel
Figure 09−10−13
FIRE PROTECTION
Description
Vol. 2 09−10−14
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
CONTROLS AND INDICATORS (CONT'D)
Baggage Smoke Detector Test
Annunciator Panel
Figure 09−10−14
EICAS MESSAGES
MESSAGE MEANING
AURAL WARNING
(IF ANY)
APU FIRE Fire detected in the APU enclosure. FIRE BELL
L ENGINE FIRE
Fire detected in the respective engine nacelle. FIRE BELL
R ENGINE FIRE
L JETPIPE OVHT
Fire detected in the respective jetpipe and/or pylon
area.
“JETPIPE
OVERHEAT”
R JETPIPE OVHT
GALLEY OVHT Galley overheat detected (if galley overheat detector
is installed).
WARNING
Triple Chime
SMOKE BAGGAGE BAY Smoke detected in the baggage compartment. “SMOKE”
SMOKE TOILET Smoke detected in the lavatory area. “SMOKE”
APU BOTTLE LO APU firex bottle pressure is low.
APU FIRE FAIL APU fire detection loop is failed (shorted out).
APU NEG G SOV
APU negative-G shutoff valve is open after actuation of the APU FIRE PUSH
switch/light, or the negative-G shutoff valve position does not match the APU
PWR FUEL switch/light position within 5 seconds.
APU SOV
APU fuel shutoff valve is open after actuation of the APU FIRE PUSH
switch/light, or the fuel shutoff valve position does not match the APU PWR
FUEL switch/light position within 5 seconds.
FIRE PROTECTION
Description
Vol. 2 09−10−15
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
EICAS MESSAGES (CONT'D)
MESSAGE MEANING
AURAL WARNING
(IF ANY)
ENG BOTTLE 1 LO
Respective engine firex bottle pressure is low.
ENG BOTTLE 2 LO
L ENG SOV Respective fuel shutoff valve is not closed after actuation of the ENG FIRE
R ENG SOV PUSH switch/light.
L FIRE FAIL
Respective fire detection loop is failed (shorted out).
R FIRE FAIL
HYD SOV 1 Hydraulic shutoff valve is not closed after actuation of the respective ENG
HYD SOV 2 FIRE PUSH switch/light.
L JETPIPE OVHT FAIL
The respective jetpipe/pylon overheat detection loop is failed (shorted out).
R JETPIPE OVHT FAIL
APU SOV CLSD APU fuel shutoff and negative-G shutoff valves have closed after actuation of
　
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