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- The cargo fire extinguishing (separate FWD &
AFT optional systems)
Note that the fire extinguishing system requires the
smoke detection system.
SMOKE DETECTORS
The cargo smoke detection system is installed in the
FWD and in the AFT/BULK cargo compartments. Four smoke
detectors are located in two cavities in the ceiling
of the AFT/BULK cargo compartment and two others
detectors in the FWD cargo compartment. The cargo smoke
detectors are interconnected to each other. They are
part of a loop, containing the lavatory smoke
detectors, which is connected to the Smoke Detection
Control Unit (SDCU).
SMOKE DETECTION CONTROL UNIT
For each compartment, the Smoke Detection Control Unit
(SDCU) activates the warning with an AND logic to
prevent false warnings. The SDCU also monitors the
smoke detectors in case of a single detection. When
only one cargo smoke detector detects smoke, the SDCU
checks the second detector automatically.
- If this test shows a normal operation of the
second detector, the first detector is declared
faulty. The result is no SMOKE warning in the
cockpit.
- If this test shows an abnormal operation of
the second detector, the SMOKE warnings are
activated. The second detector is declared
faulty.
WARNINGS
The Smoke Detection Control Unit generates signals for
cockpit local warnings, ECAM system and Cargo
Ventilation Controller. It also provides the fault
messages to the Centralized Fault Display System
(CFDS). In case of FWD or AFT/BULK smoke detection,
the respective SMOKE light comes on on the CARGO SMOKE
panel. At the same time the CARGO VENTILATION
CONTROLLER closes the isolation valves of the affected
compartment (If ventilation installed).
In case of a smoke detector failure, the SDCU sends
signals to the ECAM and CFDS systems.
DISCH PUSHBUTTON
Action on one of the FWD or AFT guarded DISCHcharge
pushbuttons discharges the bottle in the respective
cargo compartment.
When smoke is detected, the corresponding DISCH
pushbutton has to be pressed, in order to fire the
relative squib of the extinguishing bottle. Both DISCH
lights come on when the fire extinguishing bottle is
discharged. Both DISCH lights come on when the fire
extinguishing bottle is discharged.
TMUFIRZ01-T01 LEVEL 1
EFFECTIVITY 26-17-00 Page 2
Aug 31/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 26 FIRE PROTECTION
UF94200
EFFECTIVITY Page 128
ALL
CARGO FIRE PROTECTION SYSTEM PRESENTATION
TMUFIRZ01-P01 LEVEL 1
EFFECTIVITY 26-17-00 Page 3
Aug 31/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 26 FIRE PROTECTION
UF94200
EFFECTIVITY Page 129
ALL
CARGO FIRE PROTECTION SYSTEM PRESENTATION
BOTTLE
One extinguisher bottle is installed in the Forward
cargo compartment and provides fire extinguishing for
the FWD and for the AFT/BULK cargo compartment. The
bottle is equipped with a pressure switch to monitor
agent pressure and two electrically firing cartridges
or squibs for agent discharges. The bottle pressure
and the two squibs circuit conditions are continuously
monitored by the SDCU. In case of bottle pressure drop
or loss of electrical squib continuity, the SDCU sends
signals to the ECAM and CFDS.
TEST PUSHBUTTON
When the TEST pushbutton is pressed and held, the SCDU
carries out an automatic test. Smoke and a bottle
pressure drop conditions are simulated. The smoke
detectors are tested. When the TEST pushbutton is
pressed and held, the SMOKE and DISCH lights on the
CARGO SMOKE panel come on, and the ECAM warnings are
activated. When the TEST pushbutton is released, the
DISCH lights go off, with a time delay of 2 seconds,
and the SMOKE lights go off, with a time delay of 10
seconds. The ECAM message disappears and will be
automatically repeated with the warning indications
for approximately 6 seconds.
TMUFIRZ01-T01 LEVEL 1
EFFECTIVITY 26-17-00 Page 4
Aug 31/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 26 FIRE PROTECTION
UF94200
EFFECTIVITY Page 130
ALL
SELF EXAMINATION
How are the cargo smoke detectors connected to the
SDCU ?
A - In parallel.
B - In series.
C - In a loop.
How many smoke detectors are installed in the cargo
compartments?
A - Three.
B - Eight.
C - Six.
When the TEST pushbutton is pressed and held, which
conditions are simulated?
A - Smoke only.
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ATA 26 FIRE PROTECTION(17)
