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Delta 767 emergency landing GSP
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Ruptured Bleed Air Duct
A ruptured bleed air duct can be quite serious, depending on what the high temp air blows on. I had to investigate an accident where the probable cause was a ruptured bleed air duct. There wasn't enough of the plane remaining to be certain.
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Definately very dangerous not to mention scary to the passengers.
Can anyone explain how hot bleed air can make it past the pack, primary/secondary heat exchangers and into the cabin? Aren't the ducts monitored by fire loops to inform crew to close off said bleed valves?
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Originally posted by T.O.G.A.Can anyone explain how hot bleed air can make it past the pack, primary/secondary heat exchangers and into the cabin? Aren't the ducts monitored by fire loops to inform crew to close off said bleed valves?
We'll have to see what they find here.
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Originally posted by flyboy2548mI don't fly the 76, but on our airplane the ducts downstream of the PACK are not monitored, the reasoning being that you will get a PACK overpress/overtemp with the PACK automatically kicking off before it will cause you any problems in the downstream ducts.
Looking forward to hearing what occurred.
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Originally posted by T.O.G.A.Right, they are also not monitored also because the air after the mixing valves is not particulary hot. Yet, a passenger was burned. Very peculiar.
Looking forward to hearing what occurred.
The article was written in an overly dramatic way. I would take little of what was in it for truth. The passenger that clamed to be burned refused treatment for the burn. That makes me think the passenger was not really burned. Here is different article less all the false drama
Signatures are overrated
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Twa 800
I forget the exact details of the pack and the fuel tank on TWA 800, I know the official explanation was a chafed wire bundle not the pack, but is it possible for a pack with a broken duct like on the Delta flight to get hot enough to start a real fire ?ASMEL-IA 1978 A&P-IA 1965 First Aloft 1954 DC-4
Dad: B-24 Ploesti Self: U205A1 private ops Nam
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Originally posted by Uncle JayI forget the exact details of the pack and the fuel tank on TWA 800, I know the official explanation was a chafed wire bundle not the pack, but is it possible for a pack with a broken duct like on the Delta flight to get hot enough to start a real fire ?
At higher power settings the temperature and pressure can damage light aluminum secondary structures and composite fiberglass panels. Given a long enough exposure at high power settings, bleed air can damage primary structure.
I've seen 3 duct failures, all on the 747-100 pre AD. Two were in the wing, one was in the aft end of the forward belly. All caused some secondary damage to the surrounding area, none caused the pilots any concern once the appropriate check list was accomplished.
The AD changed the way the ducts were stress relieved after fabrication and before pressure testing.Don
Standard practice for managers around the world:
Ready - Fire - Aim! DAMN! Missed again!
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Video of passenger's account
This is a passenger account of what happened. Sounds like the fa didn't help matters by saying fire.
Click on enlarge video if it doesn't play the first time.
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Originally posted by AirfoilsguyBleed air come from the high pressure stage of the engine. That air gets VERY hot as per the pic.
The engine bleed ports are normally identified be the stage of compression where the bleed is located. Generally the bleeds are located at the last stage of compression for each compressor spool. On the old JT3D (707 / DC8 engine) the bleeds were 9th and 16th. Each engine type may bleed air from a different port. The important thing is one bleed is from the low compressor spool and the other is from the high spool.Don
Standard practice for managers around the world:
Ready - Fire - Aim! DAMN! Missed again!
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Typical but not appropriate
Originally posted by AirfoilsguyLeave it to the media to create a dramatic event over almost nothing.
But if you think this particular incident is "almost nothing", I would strongly disagree.
This was a dangerous event and I would not want to have been a passenger on that flight.
Although, I must admit ... this is a bit ridiculous:
We're sitting four and five people in two seats.
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