Airbus A320 Cockpit Tour: #30 - Cargo Smoke Panel: What do all those buttons do?!

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In this segment we will discuss the Cargo Smoke section of the Airbus A320 Overhead.

The forward and aft cargo compartments smoke detection system consists of:
‐ Two smoke detectors that are in the forward cargo compartment ceiling panel cavities. Each
detector is linked to one of the two detection loops (dual loop principle).
‐ Four smoke detectors that are in the aft cargo compartment ceiling panel cavities. Each detector is
linked to one of the two detection loops (dual loop principle).
‐ A Smoke Detection Control Unit (SDCU)  with two identical channels, or a Cabin
Intercommunication Data Systems (CIDS) with a Smoke Detection Function (SDF)  , that
receives signals from the smoke detectors, and transmits it to the ECAM.
Smoke in one cavity activates the cargo smoke warning if:
‐ Both smoke detectors detect smoke, or
‐ One smoke detector detects smoke and the other is inoperative.
Cargo isolation valves  close automatically, and the extraction fan  stops when the cargo
smoke warning is activated.

A fire extinguishing system protects the forward and aft cargo compartments.
One fire bottle with two discharge heads, one for each compartment, supplies three nozzles:
‐ One nozzle in the forward cargo compartment
‐ Two nozzles in the aft cargo compartment.
When the flight crew presses the FWD(AFT) DISCH pb, the action ignites the corresponding squib
on the fire bottle, which then discharges the extinguisher agent into that cargo compartment.
When the bottle is empty, the DISCH light comes on amber.

SMOKE LIGHT
This red light, and the associated ECAM warning, come on when the system detects smoke in the
indicated cargo compartment. This light comes on, if:
‐ Both channels detect smoke, or
‐ One channel detects smoke and the other channel is faulty.

TEST PB
Tests the operation of the cargo smoke detection system.
When pressed for at least 3 s, and until released:
‐ Tests the smoke detectors in sequence
‐ Turns on the red SMOKE lights twice, and displays the ECAM warning
‐ Closes the isolation valves of the cargo ventilation system 
‐ The DISCH lights come on in amber.

DISCH LIGHT
Within 60 s after pressing the discharge pushbutton, the amber DISCH light comes on when the
associated bottle is fully discharged.

DISCH PB
The DISCH pb ignites the squib, thereby discharging the extinguishing agent in the affected cargo
compartment.