CHAPTER 26 Flashcards
(20 cards)
If a main engine or APU is running and the FIRE P/B is released, what will happen to the associated engine?
The guarded FIRE P/B switches give FIRE indication and are used
to isolate the related systems. When the FIRE pushbutton is released
out, the engine or APU will shut down. This also arms the
extinguishing system.
With the APU running on the ground, what would happen if the APU detected a fire warning?
On the ground, an APU FIRE will cause an automatic shutdown of the APU and an automatic discharge of the bottle.
On the main engines how many fire bottles does each engine have?
Each main engine has 2 fire bottles installed in their pylons.
How are the engine fire bottles activated?
When the FIRE pushbutton is released out, the engine or APU will shut down. This also arms the extinguishing system. The discharge of each bottle is controlled by a related AGENT P/BSW. The P/B switches are on the FIRE panel on the overhead panel.
How is the avionics equipment controlled and monitored?
The extraction airflow is downstream of the avionics equipment. The
avionics SMOKE detector, which is installed in the extraction duct, is used for the detection of smoke from the computers and control boxes. The detector is monitored by the AEVC. The smoke detector
directly sends the signal to FWC for the AVIONICS SMOKE warning
in the cockpit.
How is the cargo compartment smoke detection system controlled and monitored?
The cargo compartment smoke detection system is monitored by the
Smoke Detection Function (SDF) integrated in the Cabin Intercommunication Data System (CIDS). The CIDS-SDF receives signals from the cargo detectors and sends SMOKE or FAULT warnings to the Flight Warning Computer (FWC) to give an alert to the flight crew.
How is the lavatory smoke detection system monitored?
The lavatory smoke detection system is monitored by the SDF integrated in the CIDS. The CIDS-SDF receives signals from the lavatory detectors and sends SMOKE or FAULT warnings to the FWC to give an alert to the flight crew. LAV SMOKE warnings are also sent to the CIDS to give an alert to the cabin crew.
How is the fire protection of each lavatory controlled?
The protection of each lavatory waste bin is done by an automatic fire extinguishing system. A small pressurized extinguisher will automatically discharge if there is a fire.
How does the engine fire detection logic self check its serviceability (FAULT STATE)?
In FAULT STATE the event of gas pressure loss (pipe fracture or cut off due to a torching flame), the INTEGRITY switch opens and generates a fault signal.
How does the engine fire detection logic self detect a fire (ALARM STATE)?
In ALARM STATE the effect of an average temperature expands the helium (inert) gas, which in turn closes the ALARM switch, or the effect of heat caused by a flame or hot gas, releases core (active) gas from the hybrid core, which in turn closes the ALARM switch.
What conditions (Fully serviceable and partially serviceable) would provide a fire warning to the ENGINE FIRE panel, ENGINE START control panel, MASTER WARN and ECAM displays.
1, fire on loop A and fire on loop B
2, fire on loop A and fault on loop B
3, fault on loop A and fire on loop B
4, fault on loop A and fault on loop B within 5 seconds (both loops broken due to a torching flame).
What conditions would create a loop fault warning signal to the ECAM and Centralized Fault Display Interface Unit (CFDIU)?
The FDU generates an inoperative signal in any of the following conditions -
1, electrical failure
2, integrity failure
3, detection of a single loop FIRE during more than 16 s while the other loop is in normal condition.
If one loop is faulty how is a MASTER WARN caution generated?
The broken channels provides a fire warning positive logic to the FDU logic gates which when the serviceable loop detects a fault its logic is passed through an AND GATE to the ENGINE FIRE panel, ENGINE START control panel, MASTER WARN and ECAM displays.
With the APU on the ground and running, if a fire is detected. How long would it take for the APU fire bottle to automatically discharged?
Three seconds after APU isolation, the APU fire bottle is discharged
automatically and the DISCHarge light on the AGENT P/BSW comes on.
After pressing the FIRE PUSH P/BSW the SQUIB also illuminates. what is this an indication of?
The SQUIB light comes on to indicate that fire bottle can be used.
With a APU Fire Loop A inop, can the aircraft be dispatched?
Due to APU automatic extinguishing triggered by APU Fire Loop A. The following MEL restrictions apply.
APU fire detection loop A may be inoperative provided that:
1) ETOPS beyond 120 min is not conducted, and
2) The APU fire test is made before each APU start, and
3) During APU operations on ground, APU condition is continuously monitored in the cockpit.
When smoke is detected in the avionics compartment, the smoke is directly perceptible by the crew through the centre pedestal. How is this overcome?
To prevent smoke from entering into the cockpit and cabin, the cabin
fans have to be stopped by setting to OFF the CABin FANS P/BSW on the VENTILATION panel. The MASTER CAUT must be selected before doing any of the ECAM actions.
What fan positions will stop smoke from the avionics compartment entering the flight deck?
The blower and extract fans of the avionics ventilation system must
be set to the OVeRriDe position to evacuate the smoke overboard. When the BLOWER P/BSW is set to OVRD, the blower fan stops and the air conditioning system is used as a cold air source by opening the air conditioning inlet valve.
Why is the SMOKE warning displayed with a 5 minutes countdown on the ECAM?
When the SMOKE warning is displayed, a 5 minutes countdown is also displayed on ECAM. After the ventilation system reconfiguration, the cockpit crew should allow 5 minutes for the SMOKE warning to disappear.
The ETOPS rules require the A/C to be protected against cargo fire, for the duration of the diversion (120 min, 180 min) with added 15 min. One additional features is the installation of a larger fire bottle what other feature can be utilised?
An additional fire bottle (two bottles in total), the second using a flow metering system 60 min after discharge of the first bottle.
