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Indicates that a fault exists in the main landing
gear bay overheat detection system.
MLG BAY OVHT Warning (red)
Indicates that an overheat condition exists in
one or both of the main landing gear bays.
GEAR BAY OVERHEAT
MAIN WHEEL WELL
SENSOR LOOPS
Vol. 1 10--40--3
REV 56, Jan 31/03
FIRE PROTECTION
Main Landing Gear Overheat Detection
Flight Crew Operating Manual
CSP A--013
MASTER
Main Landing Gear Overheat --- System Test
Figure 10---40---2
OVERHEAT
DETECTOR
SHORT
CIRCUIT
DETECTOR
10 ms
DELAY
CB2--N9
28 VDC
BATTERY BUS
MLG BAY OVHT
DETECTION
OVERHEAT DETECTION UNIT
OVHT
MLG BAY
OVHT TEST
PANEL
WARN
FAIL
DCU’S
EICAS DISPLAY
MLG BAY OVHT (RED)
MLG BAY FAIL (AMBER)
GEAR BAY OVERHEAT
RIGHT TEMP
SENSOR
LEFT TEMP
SENSOR
OVERHEAT
TEST
RESISTOR
INHIBIT
BTMS OVHT
MAIN LANDING GEAR WARN RESET
BAY OVERHEAT TEST
Switch
(Spring--loaded to
normal position)
OVHT--Simulates
an overheat condition
in the main landing
gear bay.
An aural and visual
message is
annunciated on EICAS.
MAIN LANDING GEAR
BAY OVERHEAT
WARNING FAIL TEST
Switch
(Spring--loaded to
normal position)
WARN FAIL--
Simulates a failure in
the main landing gear
bay overheat detection
system.
Message is
annunciated on EICAS.
HORN
OFF
ARMED
ANTI SKID
OVHT TEST
WARN FAIL
MLG BAY
OVHT
MUTED
TEST
Landing Gear Control Panel
Center Instrument Panel
REV 56, Jan 31/03
Vol. 1 10--40--4
FIRE PROTECTION
Main Landing Gear Overheat Detection
Flight Crew Operating Manual MASTER
CSP A--013
A. System Circuit Breakers
SYSTEM SUB--SYSTEM CB NAME BUS BAR CB
PANEL
CB
LOCATION
NOTES
Main Landing
Gear
Overheat
Detection
MLG BAY
OVHT DET DC BATT 2 N9

　
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