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Old Jan 31, 2012 | 9:35 am
  #46  
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Originally Posted by WIRunner
There was a hydraulics leak in that one as well. The Sioux City United crash in the early 90s had a similar outcome.

If there was a clean break, well, see above.
Actually, the two incidents were quite different.

With AA191, the engine started to fall off the pylon before take-off. The engine flew above the wing and then sliced through it.

A few seconds later, the plane hit the ground. Not only was everyone on board killed, most bodies were completely incinerated.

In the case of UA232, a fan disk failed and the debris resulted in hydraulic line damage.

First the damage was not as extreme as AA191, but also the United a/c was at 37,000.

Although the plane was virtually impossible to control, Captain Haynes was able to land at Sioux City. Although 111 people died, 185 survived the accident.

In that respect, the UA incident was obviously far less severe than the AA incident. While there are many differences, one of the main ones was that the AA incident occurred at take-off, meaning the plane is much more vulnerable, with very little altitude, flying barely above its stall speed, and heavy with fuel. Those elements certainly contributed to the magnitude of the tragedy at O'Hare.
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Old Jan 31, 2012 | 7:57 pm
  #47  
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Originally Posted by steve64
Engine mounts are actually designed to have a breakaway threshold. If an engine were to shed a few fan blades, yet remain running until the crew reacts, the resulting out-of-balance at 50,000RPM could shake the wing to pieces.
You're off by an order of magnitude there.
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Old Jan 31, 2012 | 8:19 pm
  #48  
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Originally Posted by mduell
You're off by an order of magnitude there.
I think the older (more inefficient engines) turn at a bit more than 20k rpm @ 100% but 50k rpm does seem a bit high .
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Old Feb 4, 2012 | 8:20 pm
  #49  
 
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Originally Posted by TWA Fan 1
Actually, the two incidents were quite different.

With AA191, the engine started to fall off the pylon before take-off. The engine flew above the wing and then sliced through it.

A few seconds later, the plane hit the ground. Not only was everyone on board killed, most bodies were completely incinerated.

In the case of UA232, a fan disk failed and the debris resulted in hydraulic line damage.
Very detailed recap. Bravo!
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Old Feb 4, 2012 | 9:03 pm
  #50  
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Originally Posted by Wx4caster
Slightly OT, but as AA 191 was mentioned, it reminds me of one of my favorite stories about my wife.

...

Another eerie coincidence is that the infamous DL crash of an L1011 in DFW due to a thunderstorm downdraft was also flight #191. Perhaps that number should have been retired.
I agree. Had the flight number been retired at the time of AA #191, the DL flight from DFW that crashed (which then would have had other than #191) would probably not have been affected by the downdraft.
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Old Feb 4, 2012 | 9:39 pm
  #51  
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Originally Posted by aubreyfromwheaton
As a traveler, if I noticed something out of the ordinary like that, I would have told the FA to tell the pilot. And then let the pilot decide how important it is, because I'm not an aeronautical engineer.

Because I'd rather make a normal landing in the middle of the country than an abnormal one.

Nice pickup to notice it.
+1
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Old Feb 4, 2012 | 9:41 pm
  #52  
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Originally Posted by Steve M
I agree. Had the flight number been retired at the time of AA #191, the DL flight from DFW that crashed (which then would have had other than #191) would probably not have been affected by the downdraft.
+1
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Old Feb 5, 2012 | 9:34 am
  #53  
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One of my favorite Twilight Zone episodes, Something on the Wing with William Statner.
He did report the creature on the wing but they thought he was nuts.
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Old Feb 5, 2012 | 12:06 pm
  #54  
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Originally Posted by edcho
I think the older (more inefficient engines) turn at a bit more than 20k rpm @ 100% but 50k rpm does seem a bit high .
The core on a smaller engine may turn at 20k, but the fans mentioned in the post I was replying to are turning at 2.5k (GE90) to 8k (CF34).
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