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FIRE PROTECTION
ENGINE AND APU - DESCRIPTION
A318/A319/A320/A321 FLEET DSC-26-20-10 P 2/4
FCOM 19 AUG 10
DETECTION
Applicable to: MSN
4566,,,
The engines and the APU each have a fire and overheat detection system consisting of :
Two identical gas detection loops ‐ (A and B) mounted in parallel.
‐ A Fire Detection Unit (FDU).
The gas detection loops consist of :
‐ Three sensing elements for each engine, one in the pylon nacelle, one in the engine core and one
in the engine fan section.
‐ One sensing element in the APU compartment.
When a sensing element is subjected to heat, it sends a signal to the fire detection unit.
As soon as loops A and B detect temperature at a preset level, they trigger the fire warning system.
A fault in one loop (break or loss of electrical supply) does not affect the warning system.
The unaffected loop still protects the aircraft.
If the system detects an APU fire while the aircraft is on the ground, it shuts down the APU
automatically and discharges extinguishing agent.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FIRE PROTECTION
ENGINE AND APU - DESCRIPTION
A318/A319/A320/A321 FLEET DSC-26-20-10 P 3/4
FCOM 19 AUG 10
EXTINGUISHING
Applicable to: ALL
Each engine has two extinguisher bottles equipped with electrically operated squibs to discharge
their contents. Each squib has a dual electric supply. The flight crew controls the discharge from the
ENG FIRE panel in the cockpit.
The APU has one fire extinguisher bottle that has an electrically operated squib to discharge its
agent. The flight crew controls the discharge from the APU FIRE panel in the cockpit. This bottle also
discharges automatically if there is an APU fire when the aircraft is on the ground.
FIRE WARNINGS AND LOOP CAUTIONS
Applicable to: ALL
Fire detection units process all the warnings and cautions originating in the sensing elements :
‐ The fire warning appears in case of :
• a fire signal from both loop A and B or,
• a fire signal from one loop when the other is faulty, or
• breaks in both loops occuring within 5 s of each other (flame effect), or
• a test performed on the control panel.
‐ The loop-fault cautions appear if :
• one loop is faulty or,
• both loops are faulty or,
• the fire detection unit fails.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FIRE PROTECTION
ENGINE AND APU - DESCRIPTION
Intentionally left blank
A318/A319/A320/A321 FLEET DSC-26-20-10 P 4/4
FCOM 19 AUG 10
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 1/8
FCOM 19 AUG 10
OVERHEAD PANEL
Applicable to: ALL
ENG FIRE PANEL
The aircraft has two identical ENG FIRE panels, which contain the following switches and
indicators:
(1) ENG 1 (2) FIRE pb
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 corresponding engine :
Silences ‐ the aural fire warning
‐ Arms the fire extinguisher squibs
‐ Closes the low-pressure fuel valve
‐ Closes the hydraulic fire shut off valve
‐ Closes the engine bleed valve
‐ Closes the pack flow control valve
‐ Cuts off the FADEC power supply
‐ Deactivates the IDG
ENG 1 (2) FIRE lt
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 2/8
FCOM 19 AUG 10
This red light comes on, regardless of the pushbutton's position, whenever the fire warning
for the corresponding engine is activated.
(2) AGENT 1 and AGENT 2 pb
Both of these buttons become active when the flight crew pops the ENG FIRE button for
their engine.
A brief push on the button discharges the corresponding fire bottle.
‐ “SQUIB” lights up white when the flight crew pops the ENG FIRE button for its engine to
help the flight crew identify the AGENT pushbutton to be activated.
“DISCH” lights up ‐ amber when its fire extinguisher bottle has lost pressure.
(3) TEST pb
This button permits the flight crew to test the operation of the fire detection and extinguishing
system.
When the flight crew presses it :
‐ A continuous repetitive chime sounds.
‐ The MASTER WARN lights flash.
‐ ENG FIRE warning appears on ECAM.
‐ On the FIRE panel :
　
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