A320 - All Engine Fail checklist
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A320 - All Engine Fail checklist
The first item on the checklist is to press the Emer Elec Pwr Man On switch, while the second is to attain optimum relight speed. There is no mention of IGN ON until the page overleaf. Would a flamed out engine (fuel remaining) start just by windmilling, -does IGN come on automatically in such a circumstance (CFM)?
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does IGN come on automatically in such a circumstance (CFM)?
See FCOM 70-80-30 ignition System, Continuous Ignition.
"AUTOMATIC SELECTION
The FADEC activates the automatic continuous ignition after the second attempt failed during the automatic sequence of the engine start, or, when an engine flameout condition is detected."
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Thanks Goldenrivett. As one of the first things to do on a single engine failure is to put the ignition on, I would have imagined that it is just as important for a dual engine failure scenario.
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I would have imagined that it is just as important for a dual engine failure scenario.
Only half a speed-brake
The (one) Engine Fail ABN says: Selection of continuous ignition confirms the immediate relight attempt made by the FADEC.
It also says: IF NO ENG RELIGHT AFTER 30 S: (The 30 s countdown starts as soon as the ENG 1(2) FAIL alert is triggered) ENG MASTER (AFFECTED ENGINE)..................................................... ....................... OFF
The IGN then remains on for the remaining live engine.
Apparently, people who understand how the machine works inside, believe such confirmation within the first 30 seconds is not the critical item: establishing a source of electrical power is. Even as a confirmation of the automatic transfer.
Whoever feels lucky feel free to check if the IGN sw works in dual GEN FAIL situation at all...
It also says: IF NO ENG RELIGHT AFTER 30 S: (The 30 s countdown starts as soon as the ENG 1(2) FAIL alert is triggered) ENG MASTER (AFFECTED ENGINE)..................................................... ....................... OFF
The IGN then remains on for the remaining live engine.
Apparently, people who understand how the machine works inside, believe such confirmation within the first 30 seconds is not the critical item: establishing a source of electrical power is. Even as a confirmation of the automatic transfer.
Whoever feels lucky feel free to check if the IGN sw works in dual GEN FAIL situation at all...
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Whoever feels lucky feel free to check if the IGN sw works in dual GEN FAIL situation at all...
Last edited by vilas; 27th Oct 2018 at 07:05.
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If both (all) engines have failed then there is probably a common reason - such as fuel starvation (e.g. no booster pumps?), volcanic ash? icing? etc. so until you are back in the relight envelope and away from the ash, ice etc. (or below the gravity fuel feed ceiling if no booster pumps) then relight attempts will be futile - so you may as well crack on with the more important stuff.
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say FL390, then why the rush (second line item) to attain optimum relight speed 300kts?
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why the rush (second line item) to attain optimum relight speed 300kts?
See Page 21 https://www.airbus.com/content/dam/c...agazine_07.pdf
"1) During the engine start sequence all fuel pumps were left in the OFF position, leading to the triggering of the following ECAM Cautions: FUEL L TK PUMP 1+2 LO PR FUEL R TK PUMP 1+2 LO PR The crew cleared both Cautions but left the fuel pumps in the OFF position. As a consequence, both engines were being gravity fed during the engine start, take-off and climb phases of the flight.
2) The behaviour of the engines was normal until the aircraft reached FL380, some 23 minutes after take-off. At that point, both engines rolled back, leading to: • The Mach Number to decrease from M0.78 to M0.63 • The disconnection of the Electrical Generators 1&2 (Engines 1&2 N2 being below 53%) • The Ram Air Turbine deployment (Emergency Electrical Configuration).
3) The aircraft started to descend and the crew declared an Emergency. At FL 320, the engines were recovered leading to an automatic re-connection of both Electrical Generators. The crew then decided to turn back to the departure airport where an uneventful landing was performed."
WTF?