W DOC AIRBUS | AMM A320F

CARGO COMPARTMENT FIRE EXTINGUISHING - DESCRIPTION AND OPERATION

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1. General
The cargo-compartment fire-extinguishing system is installed to extinguish a fire in the FWD and AFT/BULK cargo-compartments. It is a two-shot fire- extinguishing system. It includes:
  • Two bottles with the extinguishing agent
  • The pipes from the bottles to the compartments
  • Two toggle switches 5WX and 6WX to activate the system
  • Two SMOKE indication lights 11WH and 12WH
  • Two DISCH indication lights 12WX and 13WX
  • A control unit 10WQ for transmission of the signals, for test indication on the ECAM and for maintenance purposes.
The cargo-compartment fire-extinguishing system is installed to extinguish a fire in the FWD or in the AFT cargo-compartment. It is a single-shot fire- extinguishing system. It includes:
  • A bottle with the extinguishing agent
  • The pipes from the bottle to the compartments
  • Two pushbutton switches 3WX and 4WX to activate the system
  • Two SMOKE/DISCH indication lights 11WH and 12WH
  • The Smoke Detection Functions within the CIDS Directors (CIDS-SDF) 101RH and 102RH for transmission of the signals, for test indication on the ECAM and for maintenance purposes (Ref. AMM D/O 23-73-00-00).
The cargo-compartment fire-extinguishing system is installed to extinguish a fire in the forward and aft cargo-compartments. It is a single-shot fire- extinguishing system. It includes:
  • A bottle with the extinguishing agent
  • The pipes from the bottle to the compartments
  • Two pushbutton switches 3WX and 4WX to activate the system (the AGENT 2 positions do not operate)
  • Two SMOKE indication lights 11WH and 12WH
  • A control unit 10WQ for transmission of the signals, for test indication on the ECAM and for maintenance purposes.
The cargo-compartment fire-extinguishing system is installed to extinguish a fire in the forward and aft cargo-compartments. It is a two-shot fire- extinguishing system. It includes:
  • Two bottles with the extinguishing agent
  • The pipes from the bottles to the compartments
  • Two toggle switches 5WX and 6WX to activate the system
  • Two SMOKE indication lights 11WH and 12WH
  • Two DISCH indication lights 12WX and 13WX
  • The Smoke Detection Functions of the CIDS Directors (CIDS-SDF) 101RH and 102RH for transmission of the signals, for test indication on the ECAM and for maintenance purposes (Ref. AMM D/O 23-73-00-00).
The cargo-compartment fire-extinguishing system is installed to extinguish a fire in the forward and the aft cargo-compartments. It is a two-shot fire- extinguishing system. It has:
  • Two bottles with the extinguishing agent
  • The pipes from the bottles to the compartments
  • Two toggle switches 3WX and 4WX to activate the system
  • Two SMOKE indication lights 11WH and 12WH
  • One DISCH indication light 12WX
  • The Smoke Detection Function (SDF) of CIDS directors (CIDS-SDF) 101RH and 102RH for transmission of the signals, for test indication on the ECAM and for maintenance (Ref. AMM D/O 23-73-00-00).
The cargo-compartment fire-extinguishing system is installed to extinguish a fire in the forward and aft cargo compartments. It is a two-shot fire-extinguishing system. It includes:
  • Two bottles with the fire extinguishing agent
  • The pipes from the bottles to the compartments
  • Three switches 24WX, 25WX and 26WX to start the system
  • Two SMOKE indication lights 11WH and 12WH
  • Two DISCH indication lights 12WX and 13WX
  • The Smoke Detection Functions in Cabin Intercommunication Data System (CIDS-SDF) directors 101RH and 102RH, which is used for the transmission of the signals, test indication on the ECAM and to do a maintenance task (Ref. AMM D/O 23-73-00-00).
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2. Component Location
F Cargo-Compartment Fire-Extinguishing - Component Location ** ON A/C NOT FOR ALL
F Cargo-Compartment Fire-Extinguishing - Component Location ** ON A/C NOT FOR ALL
F Cargo-Compartment Fire-Extinguishing - Component Location ** ON A/C NOT FOR ALL
F Cargo-Compartment Fire-Extinguishing - Component Location ** ON A/C NOT FOR ALL
F Cargo-Compartment Fire Extinguishing - Component Location
F Cargo-Compartment Fire-Extinguishing - Component Location ** ON A/C NOT FOR ALL
F Cargo-Compartment Fire-Extinguishing - Component Location ** ON A/C NOT FOR ALL
F Cargo-Compartment Fire-Extinguishing - Component Location ** ON A/C NOT FOR ALL
F Cargo-Compartment Fire-Extinguishing - Component Location ** ON A/C NOT FOR ALL
F Cargo-Compartment Fire-Extinguishing - Component Location ** ON A/C NOT FOR ALL
F Cargo-Compartment Fire-Extinguishing - Component Location ** ON A/C NOT FOR ALL
F Cargo-Compartment Fire Extinguishing - Component Location ** ON A/C NOT FOR ALL
F Cargo-Compartment Fire Extinguishing - Component Location ** ON A/C NOT FOR ALL
F Cargo-Compartment Fire Extinguishing - Component Location ** ON A/C NOT FOR ALL
F Cargo-Compartment Fire-Extinguishing - Component Location ** ON A/C NOT FOR ALL
F Cargo-Compartment Fire Extinguishing - Component Location ** ON A/C NOT FOR ALL
F Cargo-Compartment Fire-Extinguishing - Component Location ** ON A/C NOT FOR ALL
F Cargo-Compartment Fire Extinguishing - Component Location ** ON A/C NOT FOR ALL
FIN FUNCTIONAL
DESIGNATION		 PANEL ZONE ACCESS
DOOR		 ATA REF
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5WX SWITCH-TOGGLE, AGENT DISCHARGE 22VU 212 26-23-00
6WX SWITCH-TOGGLE, AGENT DISCHARGE 22VU 212 26-23-00
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12WX INDICATOR LIGHT-AGENT DISCHARGED 22VU 212 26-23-00
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13WX INDICATOR LIGHT - AGENT 2 DISCHARGED 22VU 212 26-23-00
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10WQ SDCU 94VU 120 26-17-34
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4005WX BOTTLE-FIRE EXTING 132MW 130 26-23-41
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4015WX FIRE EXTINGUISHER 150 26-23-42
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4015WX FIRE EXTINGUISHER 172 26-23-42
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4020WX FIRE EXTINGUISHER 172 26-23-42
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4010WX FIRE EXTINGUISHER 130 26-23-41
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3. Description
A. Fire Extinguishing System
F Fire Extinguishing Bottle ** ON A/C NOT FOR ALL
The cargo-compartment fire-extinguishing system has a fire extinguisher bottle for the forward and aft cargo-compartments. One fire extinguisher pipe connects the bottle with the forward discharge nozzle and one pipe with the two nozzles in the aft cargo-compartment. The nozzles are installed in the cargo-compartment smoke-detector cavities. Electrically-detonated cartridges fire the extinguisher bottle. One cartridge is installed for the forward cargo-compartment and one for the aft cargo-compartment. A safety relief device is attached to the bottle to prevent a pressure increase. Outside temperatures can cause a pressure increase. A pressure switch is also attached to the bottle. It monitors the discharge of the bottle.
F Fire Extinguishing Bottle ** ON A/C NOT FOR ALL
The cargo-compartment fire-extinguishing system has two fire extinguisher bottles, 4005WX (bottle 1) and 4010WX (bottle 2). Electrically detonated cartridges fire the bottles. Bottle 1 supplies the forward and aft cargo-compartment discharge nozzles. Bottle 2 supplies the forward and aft cargo-compartment discharge nozzles through an Extended Operations (ETOPS) flow metering system. The flow metering system is installed in the fire extinguisher delivery tubes between bottle 2 and the forward and aft cargo compartments. Each of the two flow metering systems has:
  • A halon filter (water absorbing filter and solid particle filter)
  • A pressure reducer
  • A diaphragm and a check valve.
Each fire extinguisher bottle has a fill and safety relief valve to prevent over-pressure, which can be caused by outside temperature. The discharge rate of the fire extinguisher bottles is monitored by the Smoke Detector Control Unit (SDCU) 10WQ through pressure switches, which are installed in each of the two bottles.
F Fire Extinguishing Bottle ** ON A/C NOT FOR ALL
The cargo-compartment fire-extinguishing system has two fire extinguisher bottles, 4015WX (bottle 1) and 4020WX (bottle 2). The cartridges detonate electrically and fire the bottles. Bottle 1 supplies the forward and aft cargo-compartment discharge nozzles. Bottle 2 supplies the forward and aft cargo-compartment discharge nozzles through a flow metering system that makes the Extended Range Twin Engine Operation (ETOP) possible. The flow metering system is installed in the fire extinguisher delivery-tubes between bottle 2 and the forward and aft cargo-compartments. Each of the two flow metering systems has:
  • A halon filter (water absorbing filter and solid particle filter)
  • A pressure reducer
  • A diaphragm
  • A check valve.
High temperatures can cause over pressure. Each fire extinguisher bottle has a fill and safety relief-valve to prevent the over pressure. The Smoke Detection Function of the CIDS (CIDS-SDF) monitors the discharge rate of the fire extinguisher bottles with pressure switches. One pressure switch is installed in each of the two bottles.
F Fire Extinguishing Bottle ** ON A/C NOT FOR ALL
The cargo-compartment fire-extinguishing system has two fire extinguisher bottles, 4005WX (bottle 1) and 4010WX (bottle 2). The cartridges detonate electrically and fire the bottles. Bottle 1 supplies the forward and aft cargo-compartment discharge nozzles. Bottle 2 supplies the forward and aft cargo-compartment discharge nozzles through a flow metering system that makes the Extended Range Twin Engine Operation (ETOP) possible. The flow metering system is installed in the fire extinguisher delivery-tubes between bottle 2 and the forward and aft cargo-compartments. Each of the two flow metering systems has:
  • A halon filter (water absorbing filter and solid particle filter)
  • A pressure reducer
  • A diaphragm
  • A check valve.
High temperatures can cause an overpressure. Each fire extinguisher bottle has a fill and safety relief-valve to prevent the overpressure. The Smoke Detection Function of the CIDS (CIDS-SDF) monitors the discharge rate of the fire extinguisher bottles with pressure switches. One pressure switch is installed in each of the two bottles.
F Fire Extinguishing Bottle ** ON A/C NOT FOR ALL
The cargo-compartment fire-extinguishing system has a fire extinguisher bottle for the fwd and aft cargo-compartments. One fire extinguisher pipe connects the bottle with the two fwd discharge nozzles and one pipe with the three nozzles in the aft cargo-compartment. The nozzles are installed in the cargo-compartment smoke-detector cavities. Electrically-detonated cartridges fire the extinguisher bottle. One cartridge is installed for the fwd cargo-compartment and one for the aft cargo-compartment. A safety relief device is attached to the bottle to prevent a pressure increase. Outside temperatures can cause a pressure increase. A pressure switch is also attached to the bottle. It monitors the discharge of the bottle.
B. Controls and Indications
F Functional Diagram ** ON A/C NOT FOR ALL
The controls and indications are on the cargo smoke overhead-panel 22VU and the ECAM upper display unit. The overhead panel 22VU has:
  • two guarded DISCH pushbutton switches 3WX and 4WX (one for the forward and one for the aft cargo-compartment),
  • two SMOKE/DISCH indication lights 11WH and 12WH (both DISCH lamps come on when the contacts of the bottle pressure switch open),
  • a TEST pushbutton switch 13WH.
The Smoke-Detection Control Unit (SDCU) 10WQ continuously monitors the bottle pressure condition, the two cartridges and the wiring. If faults occur they will appear on the ECAM upper display unit. The faults are also transmitted to the Centralized Fault Display System (CFDS) (Ref. AMM D/O 31-32-00-00).
F Functional Diagram ** ON A/C NOT FOR ALL
The controls and indications are on the cargo smoke overhead-panel 22VU and the ECAM upper display unit. The overhead panel 22VU has:
  • Two guarded toggle switches, 5WX (AGENT 1/AGENT 2) FWD and 6WX (AGENT 1/AGENT 2) AFT
  • Two SMOKE indication lights, 11WH and 12WH
  • Two DISCH indication lights, 12WX (DISCH 1/DISCH 2) and 13WX (DISCH AGENT 2).
  • a TEST pushbutton switch 16WH.
The Smoke Detection Control-Unit (SDCU) 10WQ continuously monitors the bottle pressure condition, the two cartridges and the wiring. If faults occur they will appear on the ECAM upper display unit. The faults are also transmitted to the Centralized Fault Display-System (CFDS) (Ref. AMM D/O 31-32-00-00).
F Functional Diagram ** ON A/C NOT FOR ALL
F Functional Diagram ** ON A/C NOT FOR ALL
The controls and indications are on the cargo smoke overhead-panel 22VU and the ECAM upper display unit. The overhead panel 22VU has:
  • two guarded DISCH pushbutton switches 3WX and 4WX (one for the FWD and one for the AFT cargo-compartment),
  • two SMOKE/DISCH indication lights 11WH and 12WH (both DISCH lamps come on when the contacts of the bottle pressure switch open),
  • a TEST pushbutton switch 13WH.
The Smoke Detection Functions within the CIDS Directors (CIDS-SDF) 101RH and 102RH continuously monitor the bottle pressure condition, the two cartridges and the wiring. If faults occur they will appear on the ECAM upper display unit. The faults are also transmitted to the Centralized Fault Display System (CFDS) (Ref. AMM D/O 31-32-00-00).
F Functional Diagram ** ON A/C NOT FOR ALL
The controls and indications are on cargo smoke overhead-panel 22VU and the ECAM upper display unit. Overhead panel 22VU has:
  • Two guarded AGENT DISCH pushbutton switches 3WX and 4WX (one for the FWD and one for the aft cargo-compartment)
  • Two SMOKE indication lights 11WH and 12WH
  • TEST pushbutton switch 13WH.
The SDF in the CIDS directors (CIDS-SDF) 101RH and 102RH continuously monitor the conditions of the bottle pressure, the two cartridges and the wiring. If faults occur, they will appear on the ECAM upper display unit. The faults are also transmitted to the Centralized Fault Display System (CFDS) (Ref. AMM D/O 31-32-00-00).
F Functional Diagram ** ON A/C NOT FOR ALL
F Functional Diagram ** ON A/C NOT FOR ALL
F Functional Diagram ** ON A/C NOT FOR ALL
F Functional Diagram ** ON A/C NOT FOR ALL
The controls and indications are on the overhead-panel 22VU and the ECAM upper display unit. The overhead-panel 22VU has:
  • Two toggle switches, 5WX (AGENT 1/AGENT 2) FWD and 6WX (AGENT 1/AGENT 2) AFT, with guards
  • Two SMOKE indication lights 11WH and 12WH
  • Two DISCH indication lights, 12WX (DISCH 1/DISCH 2) and 13WX (DISCH AGENT 2)
  • The TEST pushbutton switch 16WH.
The Smoke Detection Function in the CIDS-Directors (CIDS-SDF) 101RH and 102RH continuously monitor the bottle pressure condition, the cartridges and the wiring. If faults occur, they show on the ECAM upper display unit. The faults are also transmitted to the Centralized Fault Display System (CFDS) (Ref. 31-32-00).
F Functional Diagram ** ON A/C NOT FOR ALL
The controls and indications are on overhead panel 22VU and the ECAM upper display-unit. Overhead panel 22VU has:
  • Three switches 24WX (AGENT 1) AFT, 25WX (AGENT 1) FWD and 26WX (AGENT 2) with guards
  • Two SMOKE indication-lights 11WH and 12WH
  • Two DISCH indication-lights 12WX (BTL 1/BTL 2) and 13WX (DISCH AGENT 2)
  • TEST pushbutton-switch 16WH.
The SDF in CIDS-Directors (CIDS-SDF) 101RH and 102RH continuously monitor the bottle pressure condition, the cartridges and the wiring.
If faults occur, they are shown on the ECAM upper display-unit. The faults are also transmitted to the Centralized Fault Display System (CFDS) (Ref. 31-32-00).
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4. Operation/Control and Indicating
F Cargo-Compartment Fire-Extinguishing - Schematic ** ON A/C NOT FOR ALL
F Cargo-Compartment Fire-Extinguishing - Schematic ** ON A/C NOT FOR ALL
F Cargo-Compartment Fire-Extinguishing - Schematic ** ON A/C NOT FOR ALL
F Cargo-Compartment Fire-Extinguishing - Schematic ** ON A/C NOT FOR ALL
F Cargo-Compartment Fire-Extinguishing - Schematic ** ON A/C NOT FOR ALL
F Cargo-Compartment Fire-Extinguishing - Schematic ** ON A/C NOT FOR ALL
F Cargo-Compartment Fire-Extinguishing - Schematic ** ON A/C NOT FOR ALL
F Cargo-Compartment Fire-Extinguishing - Schematic ** ON A/C NOT FOR ALL
F Cargo-Compartment Fire-Extinguishing - Schematic ** ON A/C NOT FOR ALL
F Cargo-Compartment Fire-Extinguishing - Schematic ** ON A/C NOT FOR ALL
A. Smoke Warning
If smoke occurs (Ref. AMM D/O 26-16-00-00):
  • The related red SMOKE/DISCH indication light 11WH or 12WH comes on
  • The MASTER WARNING lights flash
  • You hear a Continous Repetitive Chime (CRC)
  • On the ECAM upper display unit the related message:
    SMOKE FWD CARGO SMOKE
    AGENT...........DISCH
    or
    SMOKE AFT CARGO SMOKE
    AGENT...........DISCH
    comes on.
If a smoke warning occurs, you have to lift the guard and to push the related DISCH pushbutton switch 3WX or 4WX. The cartridge at the bottle outlet detonates and the agent discharges into the applicable cargo- compartment. The contacts of the bottle pressure switch open and give a signal to the SDCU and the relay Ann Gnd 2WX. The relay opens and closes a ground contact to the related DISCH indicator light 11WH or 12WH. The light comes on. The SDCU also gives a signal to the Flight Warning Computer (FWC) and CFDS. The FWC changes the ECAM upper display to AGENT DISCH. The CFDS stores the low-pressure data.
If smoke occurs (Ref. AMM D/O 26-16-00-00):
  • The related red SMOKE/DISCH indication light 11WH or 12WH comes on
  • The MASTER WARNING lights flash
  • You hear a Continous Repetitive Chime (CRC)
  • On the ECAM upper display unit the related message:
    SMOKE FWD CARGO SMOKE
    AGENT...........DISCH
    or
    SMOKE AFT CARGO SMOKE
    AFT ISOL VALVE....OFF
    AGENT...........DISCH
    comes on.
If a smoke warning occurs, you have to lift the guard and to push the related DISCH pushbutton switch 3WX or 4WX. The cartridge at the bottle outlet detonates and the agent discharges into the applicable cargo- compartment. The contacts of the bottle pressure switch open and give a signal to the SDCU and the relay Ann Gnd 2WX. The relay opens and closes a ground contact to the related DISCH indicator light 11WH or 12WH. The light comes on. The SDCU also gives a signal to the Flight Warning Computer (FWC) and CFDS. The FWC changes the ECAM upper display to AGENT DISCH. The CFDS stores the low-pressure data.
If smoke occurs (Ref. AMM D/O 26-16-00-00), the Smoke Detection Control Unit (SDCU) sends signals to the cockpit:
  • The Flight Warning Computer (FWC)
  • The related red indication light FWD/SMOKE 11WH or AFT/SMOKE 12WH comes on
  • The MASTER WARNING lights flash
  • You hear a Continuous Repetitive Chime (CRC)
  • On the Electronic Centralized Aircraft Monitoring (ECAM) upper display unit shows the related message:
    SMOKE FWD CARGO SMOKE
    AGENT 1.........DISCH
    or
    SMOKE AFT CARGO SMOKE
    AFT ISOL VALVE....OFF
    AGENT 1.........DISCH,
  • The ventilation controller (Ref. AMM D/O 21-20-00-00) closes the related cargo-compartment isolation valves.
    The pilot operates the FWD AGENT DISCH toggle switch 5WX or the AFT AGENT DISCH toggle switch 6WX to the AGENT 1 position. A current detonates the explosive charge in the cartridge of bottle 1, the DISCH 1 legend in the AGENT DISCH INDICATOR LIGHT 12WX comes on.
    The explosion create a shock wave, which fractures the rupture disc and releases the extinguishing agent into the applicable cargo compartment. As the bottle 1 discharges, the contact of the bottle pressure switch opens and gives a signal to the SDCU and to the relay BTL 1 PRESS INVERTER 16WX. This relay 16WX gives a signal about a lampdriver in 11LP (70VU) to the amber DISCH 1 legend in the indicator 12WX (the light comes on) and to the TIMER DISCH BTL2 relay 14WX.
    After a time delay of approx. 60 minutes, the TIMER DISCH BTL 2 relay 14WX closes and the signal TIMER DISCH BTL 2 in the SDCU activates a SDCU output signal for DISCH BTL 2. The amber legend DISCH AGENT 2 in the indicator light 13WX comes on.
    The pilot operates the FWD AGENT DISCH toggle switch 5WX or the AFT AGENT DISCH toggle switch 6WX to the AGENT 2 position. The extinguishing agent from bottle 2 flows through a flow metering system whitch makes sure that the correct concentration of extinguishing agent is kept in the related cargo-compartment. The pressure in bottle 2 decreases slowly. When the pressure in bottle 2 has reduced sufficiently the contact of the bottle pressure switch opens and gives a signal to the SDCU and to the relay BTL 2 PRESS INVERTER 17WX. This relay 17WX gives a signal directly to the amber DISCH 2 legend in the indicator 12WX and the light comes on.
    If the agent from bottle 2 is released correctly, the SDCU deleted the signal DISCH BTL 2 and the amber legend DISCH AGENT 2 in the indicator 13WX goes off.
NOTE: During the same moment as the pilot operates the toggle switch (FWD AGENT DISCH 5WX or AFT AGENT DISCH 6WX) in AGENT 1 position, the BOTTLE 1 PRIORITY self-holdrelay (FWD CC 23WX or AFT CC 22WX) is activated. The cartridges in bottle 2 cannot be detonated without activation of the priority relays.
If smoke occurs (Ref. AMM D/O 26-16-00-00):
  • The related red SMOKE/DISCH indication light 11WH or 12WH comes on
  • The MASTER WARNING lights flash
  • You hear a Continous Repetitive Chime (CRC)
  • On the ECAM upper display unit the related message:
    SMOKE FWD CARGO SMOKE
    AGENT...........DISCH
    or
    SMOKE AFT CARGO SMOKE
    AFT ISOL VALVE....OFF
    AGENT...........DISCH
    comes on.
If a smoke warning occurs, you have to lift the guard and to push the related DISCH pushbutton switch 3WX or 4WX. The cartridge at the bottle outlet detonates and the agent discharges into the applicable cargo-compartment. The contacts of the bottle pressure switch open and give a signal to the Smoke Detection Function within the CIDS Director (CIDS-SDF). The related DISCH indicator light 11WH or 12WH comes on. The CIDS-SDF also gives a signal to the Flight Warning Computer (FWC) and to the CFDS. The FWC changes the ECAM upper display to AGENT DISCH. The CFDS stores the low-pressure data.
If smoke occurs (Ref. AMM D/O 26-16-00-00):
  • The related red SMOKE/DISCH indication light 11WH or 12WH comes on
  • The MASTER WARNING lights flash
  • You hear a Continous Repetitive Chime (CRC)
  • On the ECAM upper display unit the related message:
    SMOKE FWD CARGO SMOKE
    AGENT...........DISCH
    or
    SMOKE AFT CARGO SMOKE
    AGENT...........DISCH
    comes on.
If a smoke warning occurs, you have to lift the guard and to push the related DISCH pushbutton switch 3WX or 4WX. The cartridge at the bottle outlet detonates and the agent discharges into the applicable cargo-compartment. The contacts of the bottle pressure switch open and give a signal to the Smoke Detection Function within the CIDS Director (CIDS-SDF). The related DISCH indicator light 11WH or 12WH comes on. The CIDS-SDF also gives a signal to the Flight Warning Computer (FWC) and to the CFDS. The FWC changes the ECAM upper display to AGENT DISCH. The CFDS stores the low-pressure data.
If smoke occurs (Ref. AMM D/O 26-16-00-00):
  • The related red SMOKE indication light 11WH or 12WH comes on
  • The MASTER WARNING lights flash
  • You hear a Continous Repetitive Chime (CRC)
  • On the ECAM upper display unit the related message:
    SMOKE FWD CARGO SMOKE
    AGENT 1.........DISCH
    or
    SMOKE AFT CARGO SMOKE
    AGENT 1.........DISCH
    comes on.
    If a smoke warning occurs, lift the guard of the toggle switch 5WX or 6WX on the panel 22VU. Then set the toggle switch to AGENT 1 or AGENT 2. The cartridge in the outlet of the selected bottle detonates and releases extinguishing agent into the related cargo-compartment. At the same time, the self-hold relay 23WX - BTL1 PRIORITY RELAY FWD CC or the 22WX - BTL1 PRIORITY RELAY AFT CC is activated. The cartridges in bottle 2 can only detonate when the priority relays are activated. If AGENT 1 is selected, bottle 1 releases its content directly into the related cargo-compartment. If AGENT 2 is selected, bottle 2 releases its content through an Extended Operations (ETOPS) metering system into the related cargo-compartment. If the fire bottle releases its content, the contacts of the bottle pressure switch open and give a signal to the Smoke Detection Function of the CIDS Director (CIDS-SDF) and the relay 16WX (bottle 1) or 17WX (bottle 2). If the relay opens, a ground contact to the annunciator 12WX - DISCH 1 or DISCH 2 closes and the indicator light comes on. If you select AGENT 1, a signal is sent to the TDC- Relay 14WX (TIMER DISCH BTL2) and the signal input TIMER (DISCH BTL2) in the CIDS-SDF to activate the CIDS-SDF output signal for DISCH BTL2 after 1 hour. The CIDS-SDF also sends a signal to the Flight Warning Computer (FWC) and to the CFDS. The FWC changes the ECAM upper display to AGENT DISCH (green). The CFDS stores the low-pressure data.
If smoke occurs (Ref. AMM D/O 26-16-00-00):
  • The related red SMOKE indication-light 11WH or 12WH comes on
  • The MASTER WARNING lights flash
  • You hear a Continous Repetitive Chime (CRC)
  • On the ECAM upper display-unit, the related message:
    SMOKE FWD CARGO SMOKE
    AGENT 1.........DISCH
    or
    SMOKE AFT CARGO SMOKE
    AGENT 1.........DISCH
    comes on.
If a smoke warning occurs, lift the guard of the switch 24WX, 25WX or 26WX on panel 22VU. Then set the switch to AGENT 1 or AGENT 2.
The cartridge in the outlet of the applicable bottle fires the explosive charges and releases extinguishing agent into the related cargo-compartment.
At the same time, self-hold relay 23WX - BTL1 PRIORITY-RELAY FWD-CC or 22WX - BTL1 PRIORITY-RELAY AFT-CC comes on. The cartridges in bottle 2 can only fire the explosive charges when the relays are on.
If you select AGENT 1, bottle 1 releases the contents directly into the related cargo-compartment.
If you select AGENT 2, bottle 2 releases the contents through an Extended Operations (ETOPS) metering system into the related cargo-compartment.
If the fire bottle releases the contents, the contacts of the bottle pressure switch open and give a signal to the SDF of the CIDS Director (CIDS-SDF) and relay 16WX (bottle 1) or 17WX (bottle 2).
If the relay opens, a ground contact to annunciator 12WX - BTL 1 or BTL 2 closes and the indicator light comes on.
If you select AGENT 1, a signal is sent to TDC - relay 14WX (TIMER DISCH BTL2) and the signal input TIMER (DISCH BTL2) in the CIDS-SDF starts the CIDS-SDF output signal for DISCH BTL2 after 1 hour.
The CIDS-SDF also sends a signal to the Flight Warning Computer (FWC) and to the CFDS. The FWC changes the ECAM upper display to AGENT DISCH (green). The CFDS contains the low-pressure data.
B. Fault Condition
The SDCU continuously monitors the bottle pressure condition, the two cartridges and the wiring. A low pressure fault causes:
On the overhead panel 22VU:
  • the DISCH indication lights to come on.
On the ECAM upper display unit:
  • the AGENT DISCH message to come on.
On the glearshield panels:
  • the MASTER CAUTION lights to come on.
In the cockpit:
  • a single chime to sound.
A cartridge fault causes a message to show on the ECAM upper display unit as follows:
  • FWD BTL SQUIB FAULT
    or
  • AFT BTL SQUIB FAULT
The faults are also transmitted to the CFDS.
The SDCU continuously monitors the bottle pressure condition, the two cartridges and the wiring. A low-pressure fault causes:
On the overhead panel 22VU:
  • the DISCH 1 and/or 2 indication lights come on.
On the ECAM upper display unit:
  • the AGENT DISCH message to come on.
On the glearshield panels:
  • the MASTER CAUTION lights to come on.
In the cockpit:
  • a single chime to sound.
A cartridge fault causes a message to show on the ECAM upper display unit as follows:
  • FWD BTL SQUIB FAULT
    or
  • AFT BTL SQUIB FAULT
The faults are also transmitted to the CFDS.
The Smoke Detection Function within the CIDS Director continuously monitors the bottle pressure condition, the two cartridges and the wiring.
A low-pressure fault causes:
On the overhead panel 22VU:
  • the DISCH indication lights to come on.
On the ECAM upper display unit:
  • SMOKE - FWD CRG BTL FAULT
  • SMOKE - AFT CRG BTL FAULT to come on.
On the glearshield panels:
  • the MASTER CAUTION lights to come on.
In the cockpit:
  • a single chime to sound.
A cartridge fault causes:
On the upper ECAM display unit:
  • SMOKE - FWD CRG BTL FAULT
  • SMOKE - AFT CRG BTL FAULT to come on.
The faults are also transmitted to the CFDS.
The Smoke Detection Function of the CIDS Director continuously monitors the bottle pressure condition, the two cartridges and the wiring.
The result of a low-pressure fault can be:
On the overhead panel 22VU:
  • The DISCH 1 and/or 2 indication lights come on.
On the ECAM upper display unit:
  • The AGENT DISCH message comes on.
On the glareshield panels:
  • The MASTER CAUTION lights come on.
In the cockpit:
  • You hear a single chime.
If there is a cartridge fault, the ECAM upper display unit shows:
  • FWD CRG BTL FAULT
    or
  • AFT CRG BTL FAULT
The faults are also transmitted to the CFDS.
The Smoke Detection Function of the CIDS Director continuously monitors the bottle pressure condition, the two cartridges and the wiring.
The result of a low-pressure fault can be:
On the overhead panel 22VU:
  • The AGENT DISCH 1 and/or 2 indication lights come on.
On the ECAM upper display unit:
  • The AGENT DISCH message comes into view.
On the glareshield panels:
  • The MASTER CAUTION lights come on.
In the cockpit:
  • You hear a single chime.
If there is a cartridge fault, the ECAM upper display unit shows:
  • FWD BTL SQUIB FAULT
    or
  • AFT BTL SQUIB FAULT.
The faults are also transmitted to the CFDS.
** ON A/C NOT FOR ALL
5. Test
A. System Test
(1) When you push the TEST button 13WH on the overhead panel 22VU, the SDCU does an automatic test. Smoke and bottle pressure drop conditions are simulated. Indications are shown as follows:
(a) On the CARGO SMOKE panel 22VU:
  • The FWD and AFT SMOKE indication lights come on.
  • The FWD and AFT DISCH indication lights come on.
(b) On the glareshield panel 130VU:
  • The MASTER WARNING lights come on.
(c) In the cockpit:
  • You hear the continuous repetitive chime.
(d) On the ECAM upper display unit, the messages:
  • SMOKE FWD CARGO SMOKE
  • AGENT...........DISCH
  • SMOKE AFT CARGO SMOKE
  • AFT ISOL VALVE....OFF
  • AGENT...........DISCH
    come into view.
(2) When you release the TEST button 13WH, the DISCH indication light goes off with a time delay of approximately 2 s. Then the SMOKE indication light goes off with a time delay of approximately 10 s. The ECAM messages go out of view and come into view again automatically with the warning indications, for approximately 6 s. (Ref. AMM D/O 26-16-00-00).
(3) When you push the TEST button 16WH on the overhead panel 22VU, the SDCU does an automatic test. Smoke and bottle pressure drop conditions are simulated. Indications are shown as follows:
(a) On the CARGO SMOKE panel 22VU:
  • The FWD and AFT SMOKE indication lights come on.
  • The DISCH 1/DISCH 2 and the DISCH AGENT 2 indication lights come on.
(b) On the glareshield panel 130VU:
  • The MASTER WARNING lights come on.
(c) In the cockpit:
  • You hear the continuous repetitive chime.
(d) On the ECAM upper display unit, the messages:
  • SMOKE FWD CARGO SMOKE
  • AGENT.1.........DISCH
  • SMOKE AFT CARGO SMOKE
  • AFT ISOL VALVE....OFF
  • AGENT.1.........DISCH
    come into view.
(4) When you release the TEST button 16WH, the DISCH indication lights go off with a time delay of approximately 2 seconds. Then the SMOKE indication lights go off with a time delay of approximately 10 seconds. The ECAM messages go out of view when you push the CLR button on the ECAM control panel. When you release the TEST button, the test of the smoke detection system does not stop immediately (Ref. AMM D/O 26-16-00-00).
(5) When you push the TEST button 13WH on the overhead panel 22VU, the smoke detection function in the CIDS director (CIDS-SDF) does an automatic test. Smoke and bottle pressure drop conditions are simulated. Indications are shown as follows:
(a) On the CARGO SMOKE panel 22VU:
  • The FWD and AFT SMOKE indication lights come on.
  • The FWD and AFT DISCH indication lights come on.
(b) On the glareshield panel 130VU:
  • The MASTER WARNING lights come on.
(c) In the cockpit:
  • You hear the continuous repetitive chime.
(d) On the ECAM upper display unit, the messages:
  • SMOKE FWD CARGO SMOKE
  • AGENT...........DISCH
  • SMOKE AFT CARGO SMOKE
  • AFT ISOL VALVE....OFF
  • AGENT...........DISCH
    come on.
(6) When you release the TEST button 13WH, the DISCH indication lights go off. Then the SMOKE indication lights go off after approximately 2-5 s. The ECAM messages go out of view and come again into view automatically with the warning indications given by CIDS-SDF 2, for approximately 2-5 s. (Ref. AMM D/O 26-16-00-00).
(7) When you push the TEST button 13WH on the overhead panel 22VU, the smoke detection function in the CIDS director (CIDS-SDF) does an automatic test. Smoke and bottle pressure drop conditions are simulated. Indications are shown as follows:
(a) On the CARGO SMOKE panel 22VU:
  • The FWD and AFT SMOKE indication lights come on.
  • The FWD and AFT DISCH indication lights come on.
(b) On the glareshield panel 130VU:
  • The MASTER WARNING lights come on.
(c) In the cockpit:
  • You hear the continuous repetitive chime.
(d) On the ECAM upper display unit, the messages:
  • SMOKE FWD CARGO SMOKE
  • AGENT...........DISCH
  • SMOKE AFT CARGO SMOKE
  • AGENT...........DISCH
    come into view.
(8) When you release the TEST button 13WH, the DISCH indication lights go off. Then the SMOKE indication lights go off after approximately 2-5 s. The ECAM messages go out of view and come into view again automatically with the warning indications given by CIDS-SDF 2, for approximately 2-5 s. (Ref. AMM D/O 26-16-00-00).
(9) When you push the TEST button 13WH on the overhead panel 22VU, the smoke detection function in the CIDS director (CIDS-SDF) does an automatic test. Smoke and bottle pressure drop conditions are simulated. Indications are shown as follows:
(a) On the CARGO SMOKE panel 22VU:
  • The FWD and AFT SMOKE indication lights come on.
  • The FWD and AFT DISCH indication lights come on.
(b) On the glareshield panel 130VU:
  • The MASTER WARNING lights come on.
(c) In the cockpit:
  • You hear the continuous repetitive chime.
(d) On the ECAM upper display unit, the messages:
  • SMOKE FWD CARGO SMOKE
  • FWD ISOL VALVE....OFF
  • AGENT...........DISCH
  • SMOKE AFT CARGO SMOKE
  • AFT ISOL VALVE....OFF
  • AGENT...........DISCH
    come into view.
(10) When you release the TEST button 13WH, the DISCH indication lights go off. Then the SMOKE indication lights go off after approximately 2-5 s. The ECAM messages go out of view and come into view again automatically with the warning indications given by CIDS-SDF 2, for approximately 2-5 s. (Ref. AMM D/O 26-16-00-00).
(11) When you push the TEST button 16WH on the overhead panel 22VU, the smoke detection function in the CIDS director (CIDS-SDF) does an automatic test. Smoke and bottle pressure drop conditions are simulated. Indications are shown as follows:
(a) On the CARGO SMOKE panel 22VU:
  • The FWD and AFT SMOKE indication lights come on.
  • The DISCH 1/DISCH 2 and the DISCH AGENT 2 indication lights come on.
(b) On the glareshield panel 130VU:
  • The MASTER WARNING lights come on.
(c) In the cockpit:
  • You hear a Continuous Repetitive Chime (CRC).
(d) On the ECAM upper display unit, the messages:
  • SMOKE FWD CARGO SMOKE
  • AGENT.1.........DISCH
  • SMOKE AFT CARGO SMOKE
  • AGENT.1.........DISCH
    come into view.
(12) When you release the TEST button 16WH, the DISCH indication lights go off. Then the SMOKE indication lights go off after approximately 2-5 seconds. The ECAM messages go out of view and come into view again automatically with the warning indications given by CIDS-SDF 2, for approximately 2-5 seconds (Ref. AMM D/O 26-16-00-00).
(13) When you push the TEST button 16WH on the overhead panel 22VU, the smoke detection function in the CIDS director (CIDS-SDF) does an automatic test. Smoke and bottle pressure drop conditions are simulated. Indications are shown as follows:
(a) On the CARGO SMOKE panel 22VU:
  • The FWD and AFT SMOKE indication lights come on.
  • The DISCH 1/DISCH 2 and the DISCH AGENT 2 indication lights come on.
(b) On the glareshield panel 130VU:
  • The MASTER WARNING lights come on.
(c) In the cockpit:
  • You hear a Continuous Repetitive Chime (CRC).
(d) On the ECAM upper display unit, the messages:
  • SMOKE FWD CARGO SMOKE
  • AGENT.1.........DISCH
  • SMOKE AFT CARGO SMOKE
  • AFT ISOL VALVE....OFF
  • AGENT.1.........DISCH
    come into view.
(14) When you release the TEST button 16WH, the DISCH indication lights go off. Then the SMOKE indication lights go off after approximately 2-5 seconds. The ECAM messages go out of view and come into view again automatically with the warning indications given by CIDS-SDF 2, for approximately 2-5 seconds (Ref. AMM D/O 26-16-00-00).
B. SDCU Power-up Test
(1) Conditions of the Power-up Test Initialization
(a) Time that the computer must be de-energized:
  • 200 milliseconds.
(b) A/C configuration:
  • Whatever the A/C configuration is on ground.
(2) Progress of the Power-up Test
(a) Time:
  • 10 seconds.
(b) Cockpit repercussions directly linked to the power-up test accomplishment (some other repercussions can occur in relation to the A/C configuration but these can be ignored):
  • None.
(3) Results of the Power-up Test
(a) Test satisfactory:
  • None.
(b) Test unsatisfactory:
  • MASTER CAUT lights come on with single chime
  • ECAM warning: SMOKE LAV+CRG DET FAULT
  • ECAM maintenance page: SDCU white indication.
(4) Conditions of the Power-up Test Initialization
(a) Time that the computer must be de-energized:
  • 200 ms.
(b) A/C configuration:
  • Whatever the A/C configuration is on ground.
(5) Progress of the Power-up Test
(a) Time:
  • 10 sec.
(b) Cockpit repercussions directly linked to the power-up test accomplishment (some other repercussions can occur in relation to the A/C configuration but these can be ignored):
  • None.
(6) Results of the Power-up Test
(a) Test satisfactory:
  • None.
(b) Test unsatisfactory:
  • MASTER CAUT lights come on with single chime
  • ECAM warning: SMOKE LAV+CRG DET FAULT
  • ECAM maintenance page: SDCU white indication.
(7) Conditions of the Power-up Test Initialization
(a) Time that the computer must be de-energized:
  • 200 ms.
(b) A/C configuration:
  • Whatever the A/C configuration is on ground.
(8) Progress of the Power-up Test
(a) Time:
  • 10 sec.
(b) Cockpit repercussions directly linked to the power-up test accomplishment (some other repercussions can occur in relation to the A/C configuration but these can be ignored):
  • None.
(9) Results of the Power-up Test
(a) Test satisfactory:
  • None.
(b) Test unsatisfactory:
  • MASTER CAUT lights come on with single chime
  • ECAM warning: SMOKE LAV+CRG DET FAULT
  • ECAM maintenance page: SDCU white indication.
[Rev.10 from 2021] 2026.04.01 05:35:47 UTC
"Aviabrain" 2025