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‐ Both smoke detectors detect smoke, or
One smoke detector detects smoke, and the ‐ other smoke detector is inoperative.
When the cargo smoke warning triggers, the isolation valves (if installed) of the affected
compartment close automatically, and the extraction fan stops.
SMOKE DETECTION
Applicable to: ,
The cargo compartments have a smoke detection system. This system has :
‐ Optical smoke detectors, that are housed in cavities within the cargo compartment ceiling panels.
There is (are) :
• Two cavities in the forward cargo compartment
• One cavity in the bulk cargo compartment
• Two cavities in the aft cargo compartment.
Each cavity has two smoke detectors, and each smoke detector is linked to one of the two
detection loops (dual loop principle).
‐ A Smoke Detection Control Unit (SDCU). The SDCU receives signals from the smoke detectors,
and transmits them to the ECAM, which displays a warning in the cockpit. The SDCU has two
identical channels.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FIRE PROTECTION
CARGO COMPARTMENTS - SMOKE DETECTION
A330/A340 FLEET DSC-26-50-10 P 2/2
FCOM 19 AUG 10
If smoke is detected in a cavity, the cargo smoke warning triggers, if :
‐ Both smoke detectors detect smoke, or
‐ One smoke detector detects smoke, and the other smoke detector is inoperative.
When the cargo smoke warning triggers, the isolation valves (if installed) of the affected
compartment close automatically, and the extraction fan stops.
SCHEMATIC
Applicable to: ALL
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FIRE PROTECTION
CARGO COMPARTMENTS - FIRE EXTINGUISHING
A330/A340 FLEET DSC-26-50-20 P 1/2
FCOM 19 AUG 10
FIRE EXTINGUISHING
Applicable to:
A fire-extinguishing system protects the cargo compartments. Two fire-extinguishing bottles are
installed, and their contents can either be discharged into the FWD or AFT (including BULK) cargo
compartment. Each bottle has two discharge heads, one for each compartment.
Pressing the AGENT pushbutton, associated with the FWD (AFT / BULK) compartment, ignites the
squib of the two bottles, and Bottle 1 discharges the extinguishing agent into that compartment,
which takes about 60 s.
As the discharge cartridge of Bottle 2 has a flow-metering system, the fire-extinguishing agent slowly
discharges into the compartment, to ensure sufficient agent concentration for 120 min.
The SDCU monitors squib integrity and bottle pressure.
When Bottle 1 (2) is discharged, the BTL 1 (BTL 2) light comes on in white.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FIRE PROTECTION
CARGO COMPARTMENTS - FIRE EXTINGUISHING
A330/A340 FLEET DSC-26-50-20 P 2/2
FCOM 19 AUG 10
FIRE EXTINGUISHING
Applicable to: ,
A fire-extinguishing system protects the cargo compartments. Two fire-extinguishing bottles are
installed, and their contents can either be discharged into the FWD or AFT (including BULK) cargo
compartment. Each bottle has two discharge heads, one for each compartment.
Pressing the AGENT pushbutton, associated with the FWD (AFT / BULK) compartment, ignites the
squib of the two bottles, and Bottle 1 discharges the extinguishing agent into that compartment,
which takes about 60 s.
As the discharge cartridge of Bottle 2 has a flow-metering system, the fire-extinguishing agent slowly
discharges into the compartment, to ensure sufficient agent concentration for 240 min.
The SDCU monitors squib integrity and bottle pressure.
When Bottle 1 (2) is discharged, the BTL 1 (BTL 2) light comes on in white.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FIRE PROTECTION
CARGO COMPARTMENTS - CONTROLS AND INDICATORS
A330/A340 FLEET DSC-26-50-30 P 1/2
FCOM 19 AUG 10
OVERHEAD PANEL
Applicable to: ALL
(1) FWD (AFT) AGENT pb
When pressed, the associated squib is ignited for discharge of the extinguishing agent in the
associated cargo compartment (FWD or AFT/BULK).
SMOKE lt : It comes on red, along with an associated ECAM warning, when smoke is detected
in the associated compartment.
SQUIB lt : It comes on white, in case of a positive test.
(2) DISCH 1 (2) lt
The BTL1 or BTL2 light comes on white, when the associated bottle has discharged.
(3) TEST pb
When pressed for at least 3 s, and until it is released :
The smoke ‐ detectors in the FWD, AFT, and BULK CARGO compartment and the avionic
bay are tested by the SDCU in sequence
‐ The ventilation system’s isolation valves close
‐ BTL 1 (2) lights come on white
‐ SQUIB lights come on white, provided one of the two squib filaments is serviceable
　
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