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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.
LDG GEAR CONTROL Panel
Figure 9-10
MUTED
OFF
TEST
MLG BAY OVHT TEST
OVHT FAIL
UP DN
LDG GEAR
DN LCK
REL
ANTI-SKID
ARMED
NOSE STEER
ARMED
HORN
OFF
OVHT TEST Switch FAIL TEST Switch
P604_09_012
FIRE PROTECTION
For Training Purposes Only
May 03
9-17
P I LOT T R A I N I N G GU I D E
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.
Engine and APU Fire/Overheat Protection
Glareshield Panels
Figure 9-11
ATS
N1 TO
FAIL
APU
FIRE
PUSH
RH ENG
FIRE
PUSH
GPWS
TERR
INHB
MASTER
BOTTLE 2 WARNING
ARMED
PUSH TO
DISCH
BOTTLE
ARMED
PUSH TO
DISCH
STALL
MASTER
CAUTION
PULL UP
GND PROX
LH ENG
FIRE
PUSH
GPWS
TERR
INHB
MASTER
WARNING BOTTLE 1
ARMED
PUSH TO
DISCH
STALL
MASTER
CAUTION
PULL UP
GND PROX
ATS
N2 SYNC
ATS
N1 TO
FAIL
LH ENGINE FIRE PUSH Switch/Light
(guarded, alternate-action)
Push:
Illuminated












arms Firex bottle 1 and 2, BOTTLE 1 (2) ARMED PUSH TO
DISCH switch/lights illuminate green
closes left fuel shutoff valve (SOV)
closes left hydraulic shutoff valve (SOV)
shuts down generator 1
closes left 10th- and 14th-stage bleed air shutoff valves (SOVs)
disables left engine ignition
– Indicates a left engine overheat/fire condition.
BOTTLE 1 ARMED PUSH TO DISCH
Switch/Light (momentary-action)
Push
Illuminated
– Fires squib to discharge Firex bottle 1
agent into applicable engine.
– Indicates Firex bottle 1 is armed
for discharge.
: Switch/light will extinguish after agent
is discharged.
NOTE
BOTTLE 2 ARMED PUSH TO DISCH
Switch/Light (momentary-action)
Push
Illuminated
– Fires squib to discharge Firex bottle 2
agent into the applicable engine.
– Indicates Firex bottle 2 is armed
for discharge.
: Switch/light will extinguish after agent is
discharged.
NOTE
RH ENGINE FIRE PUSH Switch/Light
(guarded, alternate-action)
Push:












arms Firex bottle 1 and 2, BOTTLE 1 (2) ARMED PUSH TO
DISCH switch/lights illuminate green
closes right fuel shutoff valve (SOV)
closes right hydraulic shutoff valve (SOV)
shuts down generator 2
closes right 10th- and 14th-stage bleed air shutoff valves
(SOVs)
disables right engine ignition
P604_09_013
APU ENGINE FIRE PUSH Switch/Light
(guarded, alternate-action)
Push:
Illuminated










commands an APU shutdown.
arms APU Firex bottle, APU BOTTLE
ARMED PUSH TO DISCH switch/light
illuminates green.
closes APU Fuel Shutoff Valve and
Negative-G Shutoff Valve
closes APU LCV
shuts down APU generator
– Indicates an APU
overheat/fire condition.
APU BOTTLE ARMED PUSH TO DISCH
Switch/Light (momentary-action)
Push
Illuminated
– Fires squib to discharge APU Firex bottle
agent into the APU enclosure.
– Indicates APU Firex bottle is armed
　
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