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  #21  
Old 26-06-2007, 02:21 PM
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No engines = no hydraulics = bad ..Unless its fly by wire aircraft.
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  #22  
Old 26-06-2007, 02:30 PM
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Quote:
Originally Posted by sleepy
To an extent.

Depends on the aircraft. Engines provide more than thrust for some planes. They are power for electrical systems, hydraulics and also pressurise the air in the cabin.
A British Airways 747 lost all 4 engines a few years ago near Singapore and spent over ten minutes gliding until they got power back. I'm assuming it was still losing sh*tloads of height though.
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  #23  
Old 26-06-2007, 03:02 PM
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Quote:
Originally Posted by perthzed
A British Airways 747 lost all 4 engines a few years ago near Singapore and spent over ten minutes gliding until they got power back. I'm assuming it was still losing sh*tloads of height though.
errm from memory if its the one im thinking of... they weren't gliding... they were nose diving and were lucky that the power came on by chance.

Behind maintenance of the fleet I'm unsure of, but we recently did just get another Dash 8 300, so the engineers had to spend a fair wack of time getting that all together ready for a CASA inspection and then once that was done, one of the other 300's we have went in for a very well deserved service!!! Theres only so many planes that can be serviced at once!!!
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  #24  
Old 26-06-2007, 03:17 PM
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Quote:
Originally Posted by perthzed
A British Airways 747 lost all 4 engines a few years ago near Singapore and spent over ten minutes gliding until they got power back. I'm assuming it was still losing sh*tloads of height though.
Pretty sure that there is a wind generator that deploys in that situation to restore enough power to "control" the plane and try and restart the engines.
The plane would have had to go into a dive if it lost air compression in the cabin.

Last edited by sleepy; 26-06-2007 at 03:20 PM.
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  #25  
Old 26-06-2007, 03:40 PM
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Quote:
Originally Posted by sleepy
Pretty sure that there is a wind generator that deploys in that situation to restore enough power to "control" the plane and try and restart the engines.
The plane would have had to go into a dive if it lost air compression in the cabin.
It was volcanic ash in the engines causing a flameout.. The plane was flying through a volcanic ash cloud from a recent eruption near Jakarta. The engines restarted once they cleared the cloud of ash.

The ash acts to choke the engine, fuel surge occours, and the engines flame out. Its the "straight through" design of the gas turbine's/jet engine's air flow that causes this.

Edit: Correct name for this phenomena is compressor stall.

From wiki: "A compressor stall is a situation of abnormal airflow through the compressor stage of a jet engine, causing a stall of the vanes of the compressor rotor.

All compressor stalls result in a loss of engine power. This power failure may only be momentary (occurring so quickly it is barely registered on engine instruments), or may shut the engine down completely (that is, causing a flameout). When a compressor stall affects the airflow through the entire engine it is also known as a compressor surge (although definitions differ, and often the terms are used interchangeably)."
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Last edited by vyper; 26-06-2007 at 03:48 PM.
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  #26  
Old 26-06-2007, 03:55 PM
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^^^^^ Nice google.

Yes WAI most planes can glide without engines but remember, to glide u need to have speed, and to have speed u need to loose altitude, and if u loose all your altitude before u find a nice flat landing spot say an airstrip then lets just say good luck as thats what gets you
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Old 26-06-2007, 04:07 PM
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My bad...

Flight 9, From Heathrow to Perth with a stopover in Jakarta, British Airways June 4th 1982.

They did infact glide... the 747 isn't built for gliding but for every 15km travelled they drop 1km. Would have eventually had to do an emergency ditching procedure into the ocean, if the power didn't come back on.

PART ONE:
http://www.youtube.com/watch?v=IKJXvXMQ9WQ

PART TWO:
http://www.youtube.com/watch?v=mVvax...elated&search=
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  #28  
Old 26-06-2007, 04:19 PM
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Quote:
Originally Posted by DarkMoose
^^^^^ Nice google.

Yes WAI most planes can glide without engines but remember, to glide u need to have speed, and to have speed u need to loose altitude, and if u loose all your altitude before u find a nice flat landing spot say an airstrip then lets just say good luck as thats what gets you
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Quote:
Originally Posted by megs_wrx
My bad...

Flight 9, From Heathrow to Perth with a stopover in Jakarta, British Airways June 4th 1982.

They did infact glide... the 747 isn't built for gliding but for every 15km travelled they drop 1km. Would have eventually had to do an emergency ditching procedure into the ocean, if the power didn't come back on.

PART ONE:
http://www.youtube.com/watch?v=IKJXvXMQ9WQ

PART TWO:
http://www.youtube.com/watch?v=mVvax...elated&search=
Flight 9, that's the one... Air crash investigation ftw
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  #29  
Old 26-06-2007, 04:20 PM
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Dash 8 engine failure eh??? Should have called rogercordia.
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  #30  
Old 26-06-2007, 04:21 PM
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hmmm just reminded me of another Air Crash Investigations episode with an Emb 120 Brasilia where one engine malfunctions. Actually exploded and was just hanging off the wing.

http://www.youtube.com/watch?v=yg2iHsl9hQI
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