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American 763 takeoff incident, ORD

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American 763 takeoff incident, ORD

Old 30th Oct 2016, 01:56
  #61 (permalink)  
 
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All makes perfect sense regarding PMA turbine blades. I hadn't considered the differences in through-blade cooling airflow - very much a critical concern in that part of the engine core. Thank you LomaP and TD.

I thought GE re-jiggered manufacturing and overhaul specs after the first couple of HPT disk failures and those changes were designed to mitigate these events - but my point may be moot as we really don't know what happened yet.
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Old 30th Oct 2016, 02:02
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NTSB saying #2 stage high pressure turbine disk failed, confirming piece landing on UPS warehouse a half mile away and another piece a third of a mile away.
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Old 30th Oct 2016, 02:12
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In addition to what tdracer already highlighted, with regards to PMA parts.

This article may be of some interest.

http://www.chromalloy.com/files/news...542415a369.pdf

Dated December 2009

"There are now more than 300,00 approved PMA parts, and the number grows each year by about 35,000"

"To give an example of how our prices compare to OEMs, you can pay $50-83 for a wheel seal, while our prices are $30-50. This adds up to a large saving for an airline using 500 seals each year"
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Old 30th Oct 2016, 03:51
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NTSB Pelim

NTSB: Engine disk failed, sending pieces flying from plane at O'Hare - Chicago Tribune

....Examination of the engine revealed that the stage two disk of a high-pressure turbine failed, Lorenda Ward, a senior investigator for the NTSB, said in a news conference late Saturday afternoon at O'Hare....
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Old 30th Oct 2016, 06:32
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'
One piece of the disk was found in a UPS warehouse 2,920 feet south of the plane and another piece was found about 0.3 miles north of the plane on airport property. About 90 percent of the disk has been found.
The disk pieces will be sent to Washington, D.C., for testing, officials said. The right engine — the one involved in Friday's accident — was made by General Electric. It will be removed, sent to GE and dismantled. Maintenance records will be reviewed as part of the investigation, Ward said."
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Old 30th Oct 2016, 07:51
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Maybe the tire failed because a piece of the engine sliced through it?
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Old 30th Oct 2016, 08:21
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It still amazes me how stupid people would rather stand in a cabin filming an evacuation to be a star of YouTube instead of trying to save themselves from possible smoke inhalation. Is this the norm now?

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Old 30th Oct 2016, 09:08
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crewmeal

be thankful that in this incident, plus the dynamic airways 767 fort Lauderdale fire, and both the EK and the SQ 777 incidents that the wind was blowing the fire AWAY from the fuselage each time
otherwise we could have been looking at 4 x Manchester B/Airtours scenarios
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Old 30th Oct 2016, 09:13
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@ crewmeal... "It still amazes me how stupid people would rather stand in a cabin filming an evacuation to be a star of YouTube instead of trying to save themselves from possible smoke inhalation. Is this the norm now?"
To be fair to the person filming, he was waiting in line to get out, I do not believe he was just standing there filming.

You can hear some people yelling at others to get out (I presume some were trying to pull things out of the overhead bins). Even once outside the aircraft you can hear a woman calling someone a sick
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Old 30th Oct 2016, 12:16
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There doesn't appear to be much instruction from cabin crew at the door - I heard a brief mention of "sitting position" but other than that it wasn't obvious there was even a crew member there!
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Old 30th Oct 2016, 15:06
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Bet that was a rush!
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Old 30th Oct 2016, 15:18
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Forgetting to shut the engines down immediately after an evacuation command, with unusable slides and/or passengers blown the ground, seems to become a common occurrence.

Or maybe it is placed too far down in the evacuation checklist?
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Old 30th Oct 2016, 16:38
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Going only from that evacuation video, my wife (ex cabin crew) remarked on the lack of commands from the cabin crew.
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Old 30th Oct 2016, 17:23
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Going only from that evacuation video, my wife (ex cabin crew) remarked on the lack of commands from the cabin crew.
Thought the same - obviously I wasn't there but there didn't seem to be an awful lot of taking control of the situation. Then again, the pax seem to be doing the sensible thing.
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Old 30th Oct 2016, 17:38
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Originally Posted by Hotel Tango View Post
Going only from that evacuation video, my wife (ex cabin crew) remarked on the lack of commands from the cabin crew.
I thought the same too. I have done one (fairly uneventful) evacuation and I was shouting commands as loud as I could
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Old 30th Oct 2016, 17:38
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cabin crew seemed very passive in videos - seems unusual - but all on board OK and off OK quickly and not too much hand baggage this time down the chutes -
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Old 30th Oct 2016, 17:48
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With the mention of the engine remaining running, and slides being blown around, I wonder who initiated the evacuation- Flight deck or Cabin crew. (I can't quite bring myself to read back through the thread to see if it's mentioned.

I once had a conversation with one of the more seasoned number-ones, who took the view that if she started an evacuation without instruction from us on the flight deck, then her responsibility was to the greater passenger load as a whole, rather than the unfortunate first one down the slide and into a still running engine...
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Old 30th Oct 2016, 18:04
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cabin crew seemed very passive in videos
Isn't it normal for cabin crew of US legacy carriers to disappear into the galley at doors closed and pass the time until doors open on arrival with reading magazines. Maybe they just didn't hear the evac command.
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Old 30th Oct 2016, 18:33
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ATC recording says skipper announcing to tower we are evacuating about 2 mins or less after stopping
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Old 30th Oct 2016, 18:56
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Originally Posted by Machdiamond View Post
Forgetting to shut the engines down immediately after an evacuation command, with unusable slides and/or passengers blown the ground, seems to become a common occurrence.

Or maybe it is placed too far down in the evacuation checklist?
It's the second item after the checklist, after the parking brake is set. The evacuation command is the last item, as it should be. You need to evaluate the situation and not rush a checklist to be sure everything gets done.

This was most likely a cabin crew intimated evacuation, which they are entitled to do, but only if they cannot contact the flightdeck. The report will show the truth, but I would suspect that the flight attendants jumped the gun on the evacuation. It is fortunate that the flightdeck had already turn the fuel control switches off and the engine was winding down.
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