AA 767-300 on fire at O'Hare | FerrariChat

AA 767-300 on fire at O'Hare

Discussion in 'Aviation Chat' started by beast, Oct 28, 2016.

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  1. GrigioGuy

    GrigioGuy Splenda Daddy
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    Idiot

    [ame]http://www.youtube.com/watch?v=HNuif8YrBf4[/ame]
     
  2. tazandjan

    tazandjan Three Time F1 World Champ
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    Uncontained engine failure from latest reports.
     
  3. beast

    beast F1 World Champ

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  4. F1tommy

    F1tommy F1 World Champ
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    The 737 does not look to bad. The DC10 and 767-300 look pretty bad and both aircraft are w/off's. Good thing the Chicago pilot did a high speed abort just like the BA 777 crew in LAS.
     
  5. KKSBA

    KKSBA F1 World Champ
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  6. Bisonte

    Bisonte F1 Veteran
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    Good thing that happened before V1. Reminds me of the Air France Concorde crash.
     
  7. KKSBA

    KKSBA F1 World Champ
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    Spot on! Just about identical.

    "Gossip from Chicago suggests, a number of right hand main tyres burst after the aircraft hit a foreign object on the runway, debris penetrated the right hand inner fuel tank causing a substantial fuel leak and resulting fire."
     
  8. Bisonte

    Bisonte F1 Veteran
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    Wow, glad the outcome was so much better in this case.
     
  9. CarterHendricks

    Sep 26, 2005
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    Maybe not spot-on. As Taz said, it appears to be an uncontained engine failure. Might have taken out a tire. Somehow missed the cabin. As the Chicago Tribune reported yesterday:

    The FAA said the problem started with a blown tire, but American said the takeoff was aborted "due to an engine-related mechanical issue."

    A large rounded piece of metal believed to have come from the plane smashed through the roof of a UPS facility on the airport grounds and bounced off the floor, according to an airport worker. "It looks like a piece of a turbine disk from a jet engine," the worker said, adding it was too hot to touch.

    --Carter
     
  10. Tcar

    Tcar F1 Rookie

  11. KKSBA

    KKSBA F1 World Champ
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  12. KKSBA

    KKSBA F1 World Champ
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    A day later and more details.
     
  13. tazandjan

    tazandjan Three Time F1 World Champ
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    On Concorde, a tire took out an engine. On this one an engine took out a tire or two.
     
  14. KKSBA

    KKSBA F1 World Champ
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    No.

    On takeoff, debris on the runway took out Concorde tires that punctured a fuel tank. That fuel then fed a combined engine fire.
     
  15. Tim Wells

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  16. solofast

    solofast Formula 3

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    Turbine disks tend to fail on acceleration to max speed from idle, typically the kind of transient that you get on acceleration to max power on takeoff.

    The reason for this is that there are two things causing disk stress. One is the rotational speed (and stress is a square of speed) and the other is due to the difference in temperature between the disk rim (hotter) and the disk bore (cooler). When you accelerate to max power from idle the disk bore is still (relatively) cool and the rim heats up due to the higher temperature from the cooling air and the heat conducted down from the turbine blades.

    Some of that thermally induced stress goes away once the entire disk heats up, but during and shortly after the acceleration to max power the stress in the bore peaks and then it gets smaller.

    This is why on many engines if you get past the first acceleration to max power on takeoff, the chances of the disk failing are much lower.

    The hard part of all this is trying to inspect a disk for a flaw (crack initiation) and making sure that if you have a flaw (the maximum size flaw that still doesn't show up in your inspection process) that you have sufficient cyclic life to get to the next inspection.

    LCF crack growth is very difficult to predict, it can also be effected by things like the material batch, stress field, number of previous cycles before initiation of a crack and things like handling damage or damage that occurs in assembly and disassembly in addition to flaws in the disk that were there when it was made.

    Back in the old days the designers didn't use as much of the material capability and peak disk stress levels were lower and the life was infinite. Now that level of thrust to weight ratio isn't acceptable so the designers, with better design tools and materials and inspection methods are able to get that level of performance.

    The down side is that the life is limited and that means there will sometimes be escapes from the quality system, with results like what you saw in this case.
     
  17. Bob Parks

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    I greatly appreciate and enjoy the educational explanations about subjects to which we are seldom exposed. Thanks.
     
  18. Bob Parks

    Bob Parks F1 Veteran
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    I'm digging back in my memory to an incident at LAX where a DC-10 departed the runway and hit a building. In the process, the righthand main gear was ripped off and a big fire ensued because the gear installation didn't allow for a clean breakaway from the wing and part of the rear spar and fuel tank was opened up to let fuel escape. Anybody have some input on this?
     
  19. tazandjan

    tazandjan Three Time F1 World Champ
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    Karim- Close enough, but your conclusion the accidents had the same cause was incorrect.
     
  20. KKSBA

    KKSBA F1 World Champ
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    I agree. I only read the Avherald article from the day before. As usual incident facts take some time to percolate up.
     
  21. KKSBA

    KKSBA F1 World Champ
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    Continental 603. Recap tire tread blowout leading to additional blowouts. Aborted below V1 but poor braking from blown tires and wet runway. Went off the end of the runway and gear collapsed.

    https://en.m.wikipedia.org/wiki/Continental_Airlines_Flight_603
     

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