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• The ENG FIRE pushbutton lights up red.
• The SQUIB lights come on white if discharge supplies are available.
• The DISCH lights come on amber.
‐ On the ENG panel (pedestal) :
• The FIRE lights come on red.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FIRE PROTECTION
ENGINE AND APU - CONTROLS AND INDICATORS
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FCOM 19 AUG 10
APU FIRE PANEL
Applicable to: ALL
(1) APU FIRE pb sw
This pushbutton's normal position is in and guarded.
The pilot pushes it to release it. It pops out, sending an electrical signal that performs the
following for the APU :
‐ shuts down the APU
‐ silences the aural warning
‐ arms the squib on the APU fire extinguisher
‐ closes the low-pressure fuel valve
‐ shuts off the APU fuel pump
‐ closes the APU bleed valve and X bleed valve and deactivates the APU generator.
The red APU FIRE light comes on when the APU fire warning is activated, regardless of the
position of the pushbutton.
(2) AGENT pb
This pushbutton becomes active when the pilot pops the APU FIRE button.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FIRE PROTECTION
ENGINE AND APU - CONTROLS AND INDICATORS
A318/A319/A320/A321 FLEET DSC-26-20-20 P 4/8
FCOM 19 AUG 10
The flight crew presses it briefly to discharge the fire bottle.
SQUIB lights up white when the pilot ‐ pops the APU FIRE button.
‐ DISCH lights up amber when the fire extinguisher bottle has lost pressure.
Note: A red disk, which is outside at the rear of the fuselage, signals that the agent is not
discharged overboard due to bottle overpressure.
(3) TEST pb
This button permits the flight crew to test the operation of the fire detection and extinguishing
system for the APU.
When the flight crew presses it :
‐ A continuous repetitive chime sounds.
‐ The MASTER WARN lights flash.
‐ APU FIRE warning appears on ECAM.
‐ On the APU FIRE panel :
• The APU FIRE pushbutton lights up red.
• The SQUIB light comes on white.
• The DISCH light comes on amber.
Note: The automatic shutdown of the APU on the ground will not occur while the flight crew
is performing this test.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FIRE PROTECTION
ENGINE AND APU - CONTROLS AND INDICATORS
A318/A319/A320/A321 FLEET DSC-26-20-20 P 5/8
FCOM 19 AUG 10
PEDESTAL
Applicable to: ALL
(1) FIRE lt
This light identifies the engine to be shutdown because of fire.
Light comes on red when an engine fire warning is triggered.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FIRE PROTECTION
ENGINE AND APU - CONTROLS AND INDICATORS
A318/A319/A320/A321 FLEET DSC-26-20-20 P 6/8
FCOM 19 AUG 10
EXTERNAL POWER PANEL
Applicable to: ALL
When the aircraft is on the ground, an APU fire causes an additional external warning.
(1) APU FIRE lt
The red APU FIRE light comes on and an external warning horn sounds when the system
detects an APU fire.
The APU fire extinguisher discharges automatically 3 s after the appearance of the fire
warning.
The light goes out when the fire has been extinguished.
(2) APU SHUT OFF pb
A flap guards this pushbutton. When there is an APU fire and someone outside the aircraft
presses this button, it confirms that the APU has shut down automatically and silences the
external warning horn.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FIRE PROTECTION
ENGINE AND APU - CONTROLS AND INDICATORS
A318/A319/A320/A321 FLEET DSC-26-20-20 P 7/8
FCOM 19 AUG 10
MAINTENANCE PANEL
Applicable to: ALL
(1) TEST pushbutton-switch
Tests the following APU circuits : Fire warning, auto extinguishing, and shutdown.
The test sequence lasts for 10 s.
During the test sequence, the APU MASTER switch must be ON.
If all circuits are operating correctly, the OK light comes on.
Note: If the APU was running, it shuts down.
(2) RESET pushbutton
Resets, the test circuit.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FIRE PROTECTION
ENGINE AND APU - CONTROLS AND INDICATORS
Intentionally left blank
A318/A319/A320/A321 FLEET DSC-26-20-20 P 8/8
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FIRE PROTECTION
ENGINE AND APU - WARNINGS AND CAUTIONS
A318/A319/A320/A321 FLEET DSC-26-20-30 P 1/2
FCOM 19 AUG 10
WARNINGS AND CAUTIONS
　
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