DOC AIRBUS | AMM A320FLAVATORY SMOKE DETECTION - DESCRIPTION AND OPERATION
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1. General
A smoke detection system is installed to detect smoke and/or fire in the lavatories. The lavatory smoke detectors are installed in a loop system, together with the cargo-compartment smoke detectors. If smoke is detected, the system gives a visual and aural warning to the flight crew. This system is made-up of:
- one smoke detector for each lavatory,
- the Smoke Detection Control Unit (SDCU).
Smoke or fire in one of the lavatories causes a detector to signal the SDCU. The SDCU sends signals to the Centralized Intercommunication Data System (CIDS) and the Flight Warning Computer (FWC). The FWC gives indications on:
- the ECAM upper display unit,
The CIDS gives indications on:
- the FWD attendant panel,
- the area call panel.
A smoke detection system is installed to detect smoke and/or fire in the lavatories. The lavatory smoke detectors are connected to the related DEU B through the CAN bus. The DEU B transmits the information to both CIDS channels. If smoke is detected, the system gives a visual and aural warning to the flight crew. This system is made-up of:
The FWC gives indications on:
** ON A/C NOT FOR ALL A smoke detection system is installed to detect smoke and/or fire in the lavatories. The lavatory smoke detectors are installed in a loop system, together with the cargo-compartment smoke detectors. If smoke is detected, the system gives a visual and aural warning to the flight crew. This system is made-up of:
- one smoke detector for each lavatory,
- the Smoke Detection Control Unit (SDCU).
Smoke or fire in one of the lavatories causes a detector to signal the SDCU. The SDCU sends signals to the Centralized Intercommunication Data System (CIDS) and the Flight Warning Computer (FWC). The FWC gives indications on:
- the ECAM upper display unit,
The CIDS gives indications on:
- the FWD attendant panel,
- the area call panel.
A smoke detection system is installed to detect smoke and/or fire in the lavatories. The lavatory smoke detectors are connected to the related DEU B through the CAN bus. The DEU B transmits the information to both CIDS channels. If smoke is detected, the system gives a visual and aural warning to the flight crew. This system is made-up of:
- One smoke detector for each lavatory
- A DEU B
- The CIDS director (Cabin Intercommunication Data-System), containing also the CIDS-SDF (CIDS Smoke Detection Function).
The FWC gives indications on:
- The ECAM upper display unit.
- The flight attendant panel
- The area call panel
- The attendant indication panel.
2. Component Location
Lavatory Smoke Detection - Component Location ** ON A/C NOT FOR ALL
Lavatory Smoke Detection - Component Location ** ON A/C NOT FOR ALL
Lavatory Smoke Detection - Component Location ** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL Lavatory Smoke Detection - Component Location ** ON A/C NOT FOR ALL Lavatory Smoke Detection - Component Location ** ON A/C NOT FOR ALL Lavatory Smoke Detection - Component Location ** ON A/C NOT FOR ALL | FIN | FUNCTIONAL DESIGNATION | PANEL | ZONE | ACCESS DOOR | ATA REF |
|---|---|---|---|---|---|
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| 1WQ | DET-SMOKE, LAVATORY A | 221 | 26-17-00 | ||
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| 3WQ | SMOKE DET. DUCT LAV."C/GS" | 261 | 26-17-00 | ||
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| 4WQ | DET-SMOKE, LAVATORY D | 261 | 26-17-00 | ||
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| 5WQ | DET-SMOKE, LAVATORY E | 262 | 26-17-00 | ||
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| 6WQ | DET-SMOKE, LAVATORY F | 261 | 26-17-00 | ||
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| 8WQ | SMOKE DET. DUCT LAV."H" FWD | 230 | 26-17-00 | ||
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| 10WQ | SDCU | 94VU | 120 | 26-17-34 | |
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| 14WQ | SMOKE DET. DUCT LAV."L"(H) | 251 | 26-17-00 | ||
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| 15WQ | SMOKE DET. DUCT LAV."M" | 252 | 26-17-00 | ||
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| 23WQ | SMOKE DET. DUCT LAV."W/FS" | 261 | 26-17-00 | ||
3. Description
A. Smoke Detectors
The smoke detector operates on the principle of scattered light. The light source, the labyrinth and the photocell are set out in a horizontal plane so that the photocell cannot receive light. But when there is smoke, the smoke particles reflect and scatter a part of the light beam. The photocell receives this light and gives an analog signal and sets off the alarm.
The smoke detector operates on the principle of scattered light. The light source, the labyrinth and the photocell are set out in a horizontal plane so that the photocell cannot receive light. But when there is smoke, the smoke particles reflect and scatter a part of the light beam. The photocell receives this light and gives an analog signal and sets off the alarm.
B. Smoke Detection Control
The smoke detection control unit (SDCU) 10WQ has two channels, which make it a fail-safe unit. The system will operate normally if one channel fails. The Built In Test Equipment (BITE) detects and isolates failures in the SDCU. It also makes sure that the smoke detectors function correctly. Most of the system functions are monitored continuously. The line key switch (on the Centralized Fault Display System (CFDS) and the Multifunction Control and Display Unit (MCDU)) simulates a smoke condition when pressed. Information of faulty equipment is signaled to the CFDS.
The CIDS part of the CIDS director controls the lavatory smoke detection function. The Lavatory smoke detectors are connected via a CAN bus to a DEU B and linked to the CIDS director via the CIDS middle line bus.
The smoke detection control unit (SDCU) 10WQ has two channels, which make it a fail-safe unit. The system will operate normally if one channel fails. The Built In Test Equipment (BITE) detects and isolates failures in the SDCU. It also makes sure that the smoke detectors function correctly. Most of the system functions are monitored continuously. The line key switch (on the Centralized Fault Display System (CFDS) and the Multifunction Control and Display Unit (MCDU)) simulates a smoke condition when pressed. Information of faulty equipment is signaled to the CFDS.
The CIDS part of the CIDS director controls the lavatory smoke detection function. The Lavatory smoke detectors are connected via a CAN bus to a DEU B and linked to the CIDS director via the CIDS middle line bus.
C. Smoke Warning Facilities
Smoke warnings are given in the cockpit and the cabin. The cockpit warnings are:
Smoke warnings are given in the cockpit and the cabin. The cockpit warnings are:
- A repetitive chime
- A red master warning light
- A smoke warning indication on the ECAM upper display unit.
- A chime from all cabin loudspeakers or from the attendant station loudspeakers
- A pink flashing indicator light and a steady text on all Attendant Indication Panels (AIP)
- An amber flashing light on the related Area Call Panel (ACP)
- An amber flashing call light on the related lavatory wall
- A common red lavatory smoke indicator on the forward attendant panel.
- A repetitive chime
- A red master warning light
- A smoke warning indication on the ECAM upper display unit.
- A chime from all cabin loudspeakers and/or from the attendant station loudspeakers.
- A pink flashing indicator light and a steady text on all Attendant Indication Panels (AIPs).
- An amber flashing light on the related Area Call Panel (ACP).
- An amber flashing call light on the related lavatory wall.
- A red indication SMOKE DETECTED on the Flight Attendant Panel (FAP). The FAP also shows information about the location of the smoke detector that has sensed smoke.
4. Operation
Lavatory Smoke Detection - Schematic ** ON A/C NOT FOR ALL
Lavatory Smoke Detection - Schematic ** ON A/C NOT FOR ALL
Lavatory Smoke Detection - Schematic ** ON A/C NOT FOR ALL
Lavatory Smoke Detection - Schematic ** ON A/C NOT FOR ALL
Lavatory Smoke Detection - Schematic ** ON A/C NOT FOR ALL Lavatory Smoke Detection - Schematic ** ON A/C NOT FOR ALL Lavatory Smoke Detection - Schematic ** ON A/C NOT FOR ALL Lavatory Smoke Detection - Schematic ** ON A/C NOT FOR ALL A. Smoke Condition
Smoke that enters the measurement chamber of the smoke detector, gives a warning signal to the SDCU. The SDCU transmits the signal to the CIDS and FWC via data buses. The CIDS directors send the signal to the FAP (Forward Attendant Panel) , AIP (Attendant Indication Panel) and ACP (Area Call Panel). The aural and visual warning reset switch on the FAP stops the warning indications on the ACP and AIP. You cannot switch off the smoke indication on the FAP. This indication goes off, when the density of the smoke drops below the threshold of the respective smoke detector.
Smoke that enters the measurement chamber of the smoke detector, gives a warning signal to the DEU B. The DEU B transmits the signal to the CIDS and FWC via data buses. The CIDS directors send the signal to the FAP (Flight Attendant Panel), AIP (Attendant Indication Panel) and ACP (Area Call Panel). The aural and visual warning reset switch on the FAP stops the warning indications on the ACP and AIP. You cannot switch off the smoke indication on the FAP. This indication goes off, when the density of the smoke drops below the threshold of the relative smoke detector.
Smoke that enters the measurement chamber of the smoke detector, gives a warning signal to the SDCU. The SDCU transmits the signal to the CIDS and FWC via data buses. The CIDS directors send the signal to the FAP (Forward Attendant Panel) , AIP (Attendant Indication Panel) and ACP (Area Call Panel). The aural and visual warning reset switch on the FAP stops the warning indications on the ACP and AIP. You cannot switch off the smoke indication on the FAP. This indication goes off, when the density of the smoke drops below the threshold of the respective smoke detector.
Smoke that enters the measurement chamber of the smoke detector, gives a warning signal to the DEU B. The DEU B transmits the signal to the CIDS and FWC via data buses. The CIDS directors send the signal to the FAP (Flight Attendant Panel), AIP (Attendant Indication Panel) and ACP (Area Call Panel). The aural and visual warning reset switch on the FAP stops the warning indications on the ACP and AIP. You cannot switch off the smoke indication on the FAP. This indication goes off, when the density of the smoke drops below the threshold of the relative smoke detector.
B. Failure Condition
The SDCU continuously monitors all components of the system. When the SDCU detects a failure of any smoke detector, the faulty detector is automatically isolated in the bus system. The failure is signaled to the CIDS, FWC and CFDS. The CIDS director signals the fault message to the Programming and Test Panel (PTP) in the cabin. The FWC initiates a fault indication on the ECAM upper display unit. If one of the two SDCU channels fail or both channels fail, an automatic fault-indication is displayed on the ECAM upper display unit.
The CIDS-SDF continuously monitors all components of the system. When the CIDS-SDF detects a failure of any smoke detector, the faulty detector is automatically isolated in the bus system. The failure is signaled to the CIDS, FWC and CFDS. The FWC initiates a fault indication on the ECAM upper display unit. If one of the two CIDS-SDF channels fail, a status/maintenance message is shown on the upper ECAM display. If both CIDS-SDF channels fail, an automatic fault-indication is displayed on the ECAM upper display unit.
The SDCU continuously monitors all components of the system. When the SDCU detects a failure of any smoke detector, the faulty detector is automatically isolated in the bus system. The failure is signaled to the CIDS, FWC and CFDS. The CIDS director signals the fault message to the Programming and Test Panel (PTP) in the cabin. The FWC initiates a fault indication on the ECAM upper display unit. If one of the two SDCU channels fail or both channels fail, an automatic fault-indication is displayed on the ECAM upper display unit.
The CIDS-SDF continuously monitors all components of the system. When the CIDS-SDF detects a failure of any smoke detector, the faulty detector is automatically isolated in the bus system. The failure is signaled to the CIDS, FWC and CFDS. The FWC initiates a fault indication on the ECAM upper display unit. If one of the two CIDS-SDF channels fail, a status/maintenance message is shown on the upper ECAM display. If both CIDS-SDF channels fail, an automatic fault-indication is displayed on the ECAM upper display unit.
5. SDCU Power-up Test
A. Conditions of Power-up Test Initialization
(1) Time that the computer must be de-energized:
- 200 miliseconds.
- 200 miliseconds.
(2) A/C configuration:
- whatever the A/C configuration is on ground.
- whatever the A/C configuration is on ground.
B. Progress of Power-up Test
(1) Time:
- 10 seconds.
- 10 seconds.
(2) Cockpit repercussions directly linked to power-up test accomplishment (some other repercussions may occur depending on the A/C configuration but these can be ignored):
- none.
- none.
C. Results of Power-up Test
(1) Test passed:
- none.
- none.
(2) Test failed:
- MASTER CAUT lights come on with single chime
- ECAM warning:
SMOKE LAV+CRG DET FAULT
- ECAM maintenance page:
SDCU white indication.
- MASTER CAUT lights come on with single chime
- ECAM warning:
SMOKE LAV+CRG DET FAULT
- ECAM maintenance page:
SDCU white indication.
6. Test
A. Smoke Warning Test
On ground, SMOKE WARN TESTS can be selected on the SMOKE menu of the MCDU. If submenu SMK DET LAVATORY TEST is selected, a submenu with all lavatory smoke detectors installed is displayed. A test for each lavatory smoke detector can be selected by the line key. During the test the active CIDS channel sends a test request to the relative lavatory smoke detector via the DEU B and the CAN bus. If the smoke detector is operative it transmits a test-alarm information to the DEU B. The DEU B transmits the information to the CIDS-SDF via the CIDS internal bus. The CIDS starts the cabin indications (chime, FAP, AIP, ACP, lavatory wall) and the CIDS-SDF sets the ARINC 429 outputs to the FWC. The lavatory smoke warning is displayed on ECAM together with a repetitive chime and master warning. The test finishes when all indications are confirmed or when the MCDU line key RETURN is selected.
On ground, SMOKE WARN TESTS can be selected on the SMOKE menu of the MCDU. If submenu SMK DET LAVATORY TEST is selected, a submenu with all lavatory smoke detectors installed is displayed. A test for each lavatory smoke detector can be selected by the line key. During the test the active CIDS channel sends a test request to the relative lavatory smoke detector via the DEU B and the CAN bus. If the smoke detector is operative it transmits a test-alarm information to the DEU B. The DEU B transmits the information to the CIDS-SDF via the CIDS internal bus. The CIDS starts the cabin indications (chime, FAP, AIP, ACP, lavatory wall) and the CIDS-SDF sets the ARINC 429 outputs to the FWC. The lavatory smoke warning is displayed on ECAM together with a repetitive chime and master warning. The test finishes when all indications are confirmed or when the MCDU line key RETURN is selected.