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.

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.”

Just saw this in the NY Post. Scariest part about it might be that the pilots were both so experienced...

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.

Classic microburst - fortunately with enough altitude to recover.

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. :O

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.

Why would you keep quiet about a microburst? :8

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

Wouldn’t there be some buffeting just before a stall? Just SLF here looking to be enlightened.

The data suggests the FPA was around -15°.

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.

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".

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.

NO. NOT AT ALL

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.

It was reported immediately after landing through the proper channels.

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.

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