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United 777 "dives" after takeoff from OGG

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United 777 "dives" after takeoff from OGG

Old 14th Feb 2023, 13:56
  #21 (permalink)  
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After a bit of pencil-sharpening, and subject to the aforementioned caveats about instantaneous vertical rates, a bit of smoothing produces an average vertical acceleration of 2.77g over the 7.2 seconds between 1050' on the way down and 1025' on the way up, so pretty close to the estimate from the unidentified analysts mentioned in the original link.
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Old 14th Feb 2023, 16:16
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The AViation Herald take on the incident….”From my editorial point of view it is clear however, that the occurrence did not happen along the lines of the report that surfaced on Sunday.”
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Old 14th Feb 2023, 16:16
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Just saw this in the NY Post. Scariest part about it might be that the pilots were both so experienced...
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Old 14th Feb 2023, 16:22
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Originally Posted by DaveReidUK
I'd be interested to see the back of the envelope with the "2.7g" calculation, given that we know it didn't come from the FDR.
How do we know that the g figure didn't come from the FDR? I'm including FOQA/FDM/QAR data as equivalent to FDR.
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Old 14th Feb 2023, 17:23
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Classic microburst - fortunately with enough altitude to recover.
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Old 14th Feb 2023, 18:16
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Originally Posted by BFSGrad
How do we know that the g figure didn't come from the FDR? I'm including FOQA/FDM/QAR data as equivalent to FDR.
Well I inferred that from the comment in the link from post #12.

But you're right, I could be wrong and those "people familiar with the incident" might be basing their comment on FDR data.

In that case, I'm going to have to try extra hard not to feel smug about the figure I calculated.
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Old 14th Feb 2023, 18:35
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The Rate of Descent achieved is very close to that of AF447 when it was stalled. The published fact that both pilots have been retrained suggest that a stall occurred rather than Mother Nature interfering.
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Old 14th Feb 2023, 19:20
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Why would you keep quiet about a microburst?
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Old 14th Feb 2023, 19:52
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Here is one passenger's account of what happened - it is certainly described as a "nose down" event. Stall recovery?

"Rod Williams II said he was sitting near the back of United Flight 1722 with his wife and kids on December 18 when it suddenly came down. The plane, which had been headed to San Francisco from Hawaii when it found itself in an intense storm, proceeded to go into a 'dramatic, nose-down' dive for about eight to 10 seconds, creating mass pandemonium in the cabin, Williams said."

"About ten minutes later, and there was an announcement that assured the passengers the event had passed. "Someone from the cockpit got on the intercom and said, 'Alright, folks, you probably felt a couple G's on that one, but everything's gonna be OK,' said Williams, who is the first passenger to provide a personal account of the incident. ''We're gonna be alright,'' Williams credited the United staffer saying."

https://www.dailymail.co.uk/news/art...es-ordeal.html

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Old 14th Feb 2023, 20:07
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Wouldn’t there be some buffeting just before a stall? Just SLF here looking to be enlightened.
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Old 14th Feb 2023, 21:16
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Originally Posted by WillFlyForCheese
proceeded to go into a 'dramatic, nose-down' dive for about eight to 10 seconds, creating mass pandemonium in the cabin
The data suggests the FPA was around -15°.
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Old 14th Feb 2023, 22:08
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Originally Posted by GlobalNav
Why wasn't this reported on Dec 18 and why did the crew continue to SFO? What does the NTSB say?
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Old 14th Feb 2023, 22:18
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My read of Part 830 is that this event does not meet the definition of “serious incident.” Therefore, no reporting is required to NTSB unless NTSB initiates the request. Appears today’s Tweet documents such a request.
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Old 14th Feb 2023, 22:40
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Originally Posted by BFSGrad
My read of Part 830 is that this event does not meet the definition of “serious incident.”
That's correct. Although the event certainly falls within the Annex 13 definition of a Serious Incident.

Annex 13 even provides, as an example of an event that would be so classified, "Controlled flight into terrain only marginally avoided".
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Old 15th Feb 2023, 02:13
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Originally Posted by pattern_is_full
Classic microburst - fortunately with enough altitude to recover.
Read previous comments. Cause is known
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Old 15th Feb 2023, 04:03
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Originally Posted by bean
Read previous comments. Cause is known
Hi, how about a date-and time check ?
Just 4 hours before this incident, HA 35 had the severe turbulence that injured many.

Both cases are weather related, I´d say.
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Old 15th Feb 2023, 11:11
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Originally Posted by Klauss
Hi, how about a date-and time check ?
Just 4 hours before this incident, HA 35 had the severe turbulence that injured many.

Both cases are weather related, I´d say.
NO. NOT AT ALL
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Old 15th Feb 2023, 12:12
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Originally Posted by Clandestino
Dang! It was a Boeing flown by US major with pilots having 25 Khrs combined so we cannot went our very strong feel... I mean: opin... I wanted to say: facts about how Airbus, everyone except the whi... I mean: first world aviators and youn... actually: inexperienced are just a menace to aviation. We can't rant about the weather either, lest we be mistaken as deluded non-thinking fools believing that global warming is real and not just what global conspiracy of lizard-people wants us to believe.
Nice job bringing race into a discussion where it clearly doesn't belong. The Captain of this flight actually was not "whi", as you say, but the investigation will fortunately proceed without no attention paid to that.
They don't call it global warming any more, btw. Because it's hasn't been warming for awhile now. They call it climate change.
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Old 15th Feb 2023, 14:04
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Another unreported near-CFIT
It was reported immediately after landing through the proper channels.
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Old 15th Feb 2023, 14:44
  #40 (permalink)  

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Originally Posted by ojguilty
... bringing race into a discussion ...
and many other typical prejudices that build a certain very ugly but well-known narrative.

Lost on you in the translation is the posted sarcasm, mocking that very mindset you cannot unsee and neither do we. All on the same team, peace.

</drift>
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