• Fire detection system comprises two loops “A” & “B”
• FDU operation same as Engine FDU
• Fire protection same as engine
• Test P/B press –
• Squib Lt. ON ( Circuit checks) + DISCH Lt. ON (lamp test)
• Does not check fire sensors, if both loops defective test does happen (red fire P/B will not light)
• APU system warnings
• APU fire push button select out
• Cancel CRC
• Squib Lt. On (arm extinguisher squib)
• Lt. On external power panel
• ECB – APU emergency shut down
• ECAM – messages
• Isolation of by ECB
• Fuel LP SOV close
• APU fuel pump shuts
• Bleed valve and cross bleed valve close
• IDG deenergize
• Auto extinguishing will trigger when APU fire detected on GND. and squib Lt. does not illuminates
• If loop “A” inoperative auto extenuating will not happen as circuit will not sense fire
• System warning
• ECAM messages (fire procedure) + CRC + M/W + Eng. & Fire panel Lts. ON
APU FIRE
PUSH
APU Extinguishing ground test
• APU master Sw ON
• Test P/B press ON Lt. illuminates + APU fire push Lt. come ON
• If APU runs, will shut down
• After 3 sec. T/D, OK Lt. appears + external fire Lt. ON
• Master Sw fault Lt. ON
• External hone sounds
• Press reset
• Hone stops
• OK Lt. OFF
• Fire P/B red Lt. OFF
• After 3 sec. system reset RESET
System operation with APU fire
• Manual extinguisher
• In flight
• CRC + Fire P/B + M/W flashers
• Press fire P/B
• CRC stops
• Fuel LP + fuel solenoid OFF ( APU shut down via ECB )
• Squib Lt. ON
• APU fault Lt. ON
• 10 sec T/D to allow reduce air flow
• Agent P/B press
• Both discharge Lt. ON
• When fire extinguishes fire P/B Lt. + M/W OFF
• Fault LT. OFF
• On Ground
• CRC + Fire P/B Lt. ON + M/W + External hone ON
• Fuel LP & Solenoid valve close + APU shut down
• CRC stops
• S/C, M/C, M/W appears
• After T/D 3 sec.
• Fire bottle discharges + “DISCH” Lt. ON
• APU fire extinguishes
• Fire P/B Lt. + External fire Lt. + M/W disappears & horn stops
• Master power Sw. fault Lt. ON and M/C remain ON
APU SHUT OFF
Avionics Smoke detection
• Smoke detector installed in the extraction duct of vent line
• During smoke detection
• Smoke detector sends signal to FWC + local warnings + AEVC
• Smoke detector is Ionization type
• Test can be done by CFDS AEVC test, AEVC checks smoke detector
• Smoke Lt. on Gen. 1 P/B triggered by Smoke detector
• When smoke detector activates Fault Lt. illuminates on Blower & Extract P/B OK
ON
SQUIB DISCH
Avionics Smoke procedure
• When Smoke detects
BLOWER M/C + S/C + Gen. 1line P/B smoke Lt. ON + Blower & Extractor Fault Lt. ON
• ECAM shows action to be taken
• Use oxy masks + crew communication not in interphone position to prevent breathing noise
• Sw. OFF cabin fans to prevent smoke get in to the cabin
• To evacuate smoke OVBD by selecting Blower OVRD + Extraction fan P/B to OVRD
• Blower OVRD – Blower stops and use air condition cold air sauce to blow smoke out board
Smoke Lt. ON – Smoke detected in the avionics ventilation duct
SDCU (Located on 94vu)
• Detects each compartment smoke detectors
• When one detector detects, SDCU checks with other status automatically
• If other detector normal, first detector declare as faulty
• If 2nd detector abnormal, 2nd one declared as faulty
• SDCU sends local warnings + ECAM and to Cargo ventilation controller + CFDS
• SDCU monitor bottle pressure + squib circuit condition, if notice any abnormality report to ECAM + CFDS
• If any wiring failure by SDCU - MCDU test facility can find the area of the failure Cargo compartment fire protection
• Smoke detectors
• Qty 2 in FWD cargo
• Qty 2 each in AFT and Bulk cargo
• Cargo smoke detectors connectors to each other and in a loop with Lavatory smoke detectors
• All connected to SDCU
• One Fire bottle located in FWD cargo for both compartments, Qty 2 squibs one for each compartment supply line with one pressure Sw.
• In case of smoke in the FWD or AFT/BULK cargo
• Smoke Lt. on flight deck illuminates
• Cargo vent. Cont. closes isolation valve of effected compartment.
• If smoke detector faulty, signal sends to CFDS + ECAM
• Discharge fire bottle by pressing agent P/B
• Discharge Lt. ON
• After agent discharged both “DISCH” Lt.s appears FWD
Smoke Lt. ON – System detects smoke in the compartment - If both channels detect smoke
- One channel detects smoke if other channel detects fault by SDCU
Disch Lt. ON – Bottle discharged FAULT
• Test (From cargo compartment smoke panel)
• SDCU simulates smoke & bottle pressure drop condition
• Warning Lt. illuminates twice + ECAM msg.
• Ventilation system isolation valves closes
• Amber discharge Lt. ON
• Switch released
• After 2 sec. discharge Lt. OFF
• After 10 sec. ECAM msg. displayed
• ECAM msg. disappear and will be automatically repeat after 6 sec. with warning indication
Cargo and Lavatory smoke detection system
• Connected to both SDCU channels via safety two wire data & supply bus working followed the close loop principle
• When smoke detectors detect Lavatory. Smoke detection warning
• To flight deck via FWC to ECAM + M/W + CRC
• SDCU sends warning to cabin CIDS then
• FWD attendant panel
• Attendant indicator panel
• Area call Lt. (Pink) + Lavatory. caution Lt. flashing
• Programming test panel (PTP)
• Lavatory. Detector faults sends to flight deck cabin for indication on CFDS for maintenance purpose,
• For the cabin – Fwd attendant panel CIDS amber Lt. + PTP indications
• Cargo smoke detected SDCU provide smoke warning to flight deck through FWC 1 & 2 such as M/W, ECAM CRC, Smoke Lt. on cargo control panel
• Cargo smoke detector detects faulty by SDCU automatically isolated, if both detectors fail in the same cavity fault msg. on ECAM and inoperative detector shown in the CFDS
• Fire bottle pressure drop or squib circuit discontinuity SDCU sends signal to ECAM & CFDS + S/C, M/C
• SDCU internal failure detected SDCU fault warning sent to flight deck ECAM + S/C +M/C and failure indicated on CFDS
• Incase of only one channel failure remaining channel will operate Cargo Smoke Detection System
• Warning
• CRC + M/W + ECAM
• Smoke Lt. on cargo panel
• Fault Lt. on isolation valve P/B
• ECAM air condition system page shows isolation valve in amber colour Smoke procedure
• CRC + M/W + smoke Lt. on cargo cont. panel
• Isolation valve fault Lt. ON
• Isolation valve select OFF valve closer confirmed
• Press bottle discharge P/B
• “DISCH” Lt. ON on both FWD and AFT cargo P/B
• After smoke disappear all warnings except DISCH Lt.
• On GND. Cargo fire bottles must not used Lavatory Fire Protection System
• Smoke detector located in the ceiling panel at exttaction duct in each lavatory
• All Lavatory Smoke detectors interconnected to each other as a part of a loop with cargo smoke detectors, sends signals to SDCU
• Smoke detectors inform to SDCU then to flight deck & cabin CIDs directors
• Warning received to SDCU activate ECAM + CIDS + CFDS
• Fire extinguishing by portable fire extinguishers
Lavatory Smoke Warnings
• In flight, CRC + M/W + ECAM activation
• In Cabin,
• Triple chime continuously
• Smoke Lt. On FAP + effected lavatory location written
• Attendant indication panel
• Area call amber Lt. flashing
• Lavatory amber Lt. flashing
• Warning can be reset by reset Sw. at FAP Lavatory waste bin extinguisher
• Auto extinguisher by incase of fire after melting fusible material in the tip of discharge tube when temp.>79 C