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And now the Boeing 777...

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jmelson:

--- Quote from: floobydust on February 23, 2021, 02:35:40 am ---Apparently that's a titanium fire in the video  :o

--- End quote ---
A titanium fire is BLINDING white.  That was apparently a composite thrust reverser component that was closer to smouldering than burning.

Jon

ve7xen:
There are three main variants of the PW4000, the variant used on the B777 is only used on the B777, and the fan design and diameter is one of the major differences. I'm not sure since public information is a bit scattered and sparse, but I believe the -112 version is the only one with hollow fan blades. Since this was a fan failure, it stands to reason they would only ground engines with similar fan construction.

Bad luck for Boeing, indeed. Not their 'fault' of course, but I wouldn't say they don't deserve it anyway.

Stray Electron:

--- Quote from: SiliconWizard on February 23, 2021, 02:06:19 am ---Sad days for Boeing really.
https://www.nbcnews.com/news/us-news/faa-orders-stepped-inspections-boeing-777s-after-engine-failure-united-n1258477

Must have been a special experience for the passengers. Seeing that through the windows:


--- End quote ---

  That's a sight that you don't see very often! The fact that the engine stayed together (well mostly) and was still running is a testament to it's ruggedness.  Mostly, I would call this event a success.

coppercone2:

--- Quote from: jmelson on February 24, 2021, 12:54:25 am ---
--- Quote from: floobydust on February 23, 2021, 02:35:40 am ---Apparently that's a titanium fire in the video  :o

--- End quote ---
A titanium fire is BLINDING white.  That was apparently a composite thrust reverser component that was closer to smouldering than burning.

Jon

--- End quote ---

there might be some titanium burning in there keeping it alive because think about how fast that plane is going and how thin the air is getting and its not going out. Its like keeping a cigarette lighter lit outside the car window on a freeway not the easiest thing I would imagine. It is going 600 miles per hour,.. though I guess it normally does burn while going at 600MPH and I don't know if there are active mechanisms to keep it lit, or if it works when its all exposed on the same principles. If I recall windproof pocket torch lighters are tested to like 60 MPH. I know they have assists that help them reignite when its raining. I think usually though keeping it burning and spinning is better? Though if it burns the wing it can burn the control routing for the flaps or whatever it has on the wing or on other planes with more engines it can burn the fuel going to the engines that are not shut off so its more important for the fire to go out there ? (b52 comes to mind). I wonder if that one can shut off just one engine or if it does the whole wing (i.e. do planes pump fuel to a engine across another engine that is clearly on fire ?). 

floobydust:
It's unnerving to see a wide band of flame for such a long time. With that much airflow, it can creep. I thought it was the housing, but there might be hexagonal-celled insulation on the thrust reverser that was the candle wick. The fuel hose and fittings were found on the ground.  As if we know the construction here.

Repairs on the smaller 94"/100": http://training.egyptair.com/Content/Download/CourseMaterials/PW4000%2094-100%20CONFERENCE%202019%20-%20DAY%202.pdf

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