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• an engine fire is detected, or
• the Fire/Overheat Test switch is pushed
3 Bottle Discharged (BTL DISCH) Lights
Illuminated (amber) – the extinguisher bottle is discharged or has low pressure.
3 4
A B B A
DISCH
BTL A BTL B
DISCH
DISCH DISCH
OVERHEAD PANEL
1
2
3
4
A
B
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
8.10.2 D6-30151-425
Fire Protection -
Controls and Indicators
4 Engine and APU Fire Override Switches
Push – unlocks the fire switch.
Fuel Control Switches
1 FUEL CONTROL Switch FireWarning Lights
Illuminated (red) –
• a related engine fire is detected, or
• the Fire/Overheat Test switch is pushed
APU Fire Panel
1 APU Fire Switch
In – normal position, mechanically locked; unlocks for a fire warning.
RUN
FUEL CONTROL
RUN
1 2 3 4
CUTOFF CUTOFF
CONTROL STAND
1
DISCH
APU BTL
DISCH APU
OVERHEAD PANEL
1
2
3
December 01, 1999
747 Operations Manual
Fire Protection -
Controls and Indicators
Copyright © The Boeing Company. See title page for details.
D6-30151-425 8.10.3
Out –
• arms APU fire extinguisher bottle
• closesAPUfuelvalve
• closes APU bleed air valve
• trips APU generator field and generator breaker
• shuts down APU (if automatic shutdown does not occur)
Rotate - discharges APU fire extinguisher into APU compartment.
2 APU Fire Warning Light
Illuminated (red) –
• an APU fire is detected, or
• the Fire/Overheat Test switch is pushed
APU automatically shuts down for a detected fire.
On the ground, the APU extinguisher automatically discharges.
3 APU Bottle Discharged (BTL DISCH) Light
Illuminated (amber) – extinguisher bottle is discharged or has low pressure.
Cargo Fire Panel
1 CARGO FIRE ARMED Light
Illuminated (white) –
• arming circuit complete
• cargo fire extinguishers armed
2 CARGO FIRE ARM Switch
Push -
ARM
FWD AFT
FWD AFT
CARGO FIRE
DISCH
DISCH
ARMED ARMED
3
1
2
4
5
OVERHEAD PANEL
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
8.10.4 D6-30151-425
Fire Protection -
Controls and Indicators
FWD –
• turns off pack 3 and all fans
• arms cargo fire extinguishers
• configures equipment cooling to override mode and turns off airflow and
heat into forward compartment
AFT –
• turns off pack 3 and all fans
• arms cargo fire extinguishers
• configures equipment cooling to override mode and turns off airflow and
heat into forward compartment
• turns off aft cargo heat
3 CARGO FIREWarning Light
Illuminated (red) -
• fire in related cargo compartment, or
• the Fire/Overheat Test switch is pushed
4 CARGO FIRE Discharge (DISCH) Switch
Push - initiates extinguisher discharge sequence to provide effective agent
concentration for 215 minutes.
5 CARGO FIRE Discharged (DISCH) Light
Illuminated (amber) - cargo fire extinguishers discharged.
Fire/Overheat Test Switch
1
TEST
FIRE/OVHT
OVERHEAD PANEL
April 01, 2001
747 Operations Manual
Fire Protection -
Controls and Indicators
Copyright © The Boeing Company. See title page for details.
D6-30151-425 8.10.5
1 FIRE/Overheat (OVHT) TEST Switch
Push and hold -
• sends fire/overheat test signals to the engine, APU, wheel well, cargo, and
bleed duct leak detectors
• tests flight deck fire and overheat indications (see Fire and Overheat
Detection System Manual Fault Test, Section 20)
APU Ground Control Fire Protection Panel
1 APU FIREWARNING HORN
Sounds intermittently during ground operation for an APU fire or fire test.
2 APU STOP Switch
Push – shuts down APU.
3 APU EXTINGUISHER DISCHARGE Switch
Push – discharges APU fire extinguisher, when armed, into APU compartment.
4 APU FIRE Light
The APU automatically shuts down for a detected fire.
RIGHT BODY GEAR
WHEEL WELL
APU FIRE
STOP
APU
EXTINGUISHER
DISCHARGE
APU FIRE SHUTDOWN MODULE M 869
WARNING HORN
APU FIRE
APU FIRE
CONTROL
PULL DOWN
PUSH BUTTON
SECONDS
MINIMUM
　
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