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United B777 engine failure

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United B777 engine failure

Old 22nd Feb 2021, 00:09
  #101 (permalink)  
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FAA inspections ordered

Multiple news outlets reporting FAA has ordered inspections.
From WSJ website this evening:

The Federal Aviation Administration said late Sunday it was ordering immediate inspections of Boeing Co. 777 aircraft equipped with the type of engine that broke apart in the air and scattered debris over a Colorado town over the weekend.

“This will likely mean some airplanes will be removed from service,” FAA Administrator Steve Dickson said in a statement.

The move comes as safety investigators in the U.S. are looking into why the Pratt & Whitney-made engine of a United Airlines Holdings Inc. 777-200 jet failed shortly after the Honolulu-bound flight took off Saturday, forcing the plane to return to the airport.

“We reviewed all available safety data following yesterday’s incident,” Mr. Dickson said. “Based on the initial information, we concluded that the inspection interval should be stepped up for the hollow fan blades that are unique to this model of engine, used solely on Boeing 777 airplanes.”

United is the only affected airline in the U.S. the FAA said. Regulators in Japan have ordered airlines to stop flying aircraft with the same engine type until further notice, the FAA said.
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Old 22nd Feb 2021, 00:20
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Old 22nd Feb 2021, 00:35
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NTSB Update
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Old 22nd Feb 2021, 03:02
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It's mostly a forcing function generated by off center a windmilling rotors at frequencies in a narrow band of RPM tied to windmill conditions. When this excitation tunes with other parts of the aircraft those parts start vibrating. All this is nicely damped down to very low stress even though the seat shakes them a little bit. (lots of history never a critical problem)
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Old 22nd Feb 2021, 03:04
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Boeing Statement

Boeing Statement on United Airlines Flight 328
  • CHICAGO, Feb. 21, 2021—Boeing today released the following statement:

"Boeing is actively monitoring recent events related to United Airlines Flight 328. While the NTSB investigation is ongoing, we recommended suspending operations of the 69 in-service and 59 in-storage 777s powered by Pratt & Whitney 4000-112 engines until the FAA identifies the appropriate inspection protocol.

Boeing supports the decision yesterday by the Japan Civil Aviation Bureau, and the FAA’s action today to suspend operations of 777 aircraft powered by Pratt & Whitney 4000-112 engines. We are working with these regulators as they take actions while these planes are on the ground and further inspections are conducted by Pratt & Whitney.

Updates will be provided as more information becomes available."
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Old 22nd Feb 2021, 03:17
  #106 (permalink)  
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Direction of turn when single engine Captain Joe FB said that the crews request for L turns was based on being single engine.

20yrs of flying jets I have never been told that direction and preferred direction of turn in a jet is important assuming clear both sides and still air. Excellent training providers.

Have I missed something ?
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Old 22nd Feb 2021, 03:21
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Loaded with enough fuel to reach Hawaii, and returning only minutes after departure, why was fuel dumping never mentioned or involved?
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Old 22nd Feb 2021, 03:58
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Because fuel jettison takes time - based on assessment of the situation, crew may have (rightly) decided to do an overweight landing & get back on the ground PDQ.
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Old 22nd Feb 2021, 04:05
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maybe if fire still visible after pulling the handle, checklist may say to land as soon as possible even if overweight?
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Old 22nd Feb 2021, 04:29
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Japan is very concerned about things falling from planes. Pilots operating to Japan have to complete an online course titled “Parts Departing from Aircraft” which shows areas to be checked. Certain runways even require an early extension of the landing gear in case any ice falls off.
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Old 22nd Feb 2021, 05:12
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​​​​​​.. Because this was an experienced crew.. The engine was in fire..
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Old 22nd Feb 2021, 05:12
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Originally Posted by MLHeliwrench
is that an ‘exit wound’ at three o’clock (from this view) lined up with the ‘entry wound’ at the wing root!

probably not. The blade components do not look like they have punctured any of the remaining structure of the acoustic liner and did not look like they penetrated the ballistic wrap. The blade failure will be interesting to look at in-depth, but I would expect that the missing blade immediately in front of the partial blade failed near the blade root, and as it has departed the fix, has impacted the following blade and torn the LE, leading to it liberating the outer 1/3rd of that blade. The liberated blade is under radial acceleration to the point of release, and aerodynamic bound vortex flow giving lift, so is going to come out at a rate and forward. The full blade looks like it is what went into the #2 pack fairing, and the area around the fuel drip drains aft of that point. 90.4% is 3255 RPM... D=112"; so at climb thrust, it's going to be a bit higher than that, and that is a fair old radial acceleration. Wouldn't be surprised if the full blade that is missing never punctured the cowling, and departed out front and then back to hit the pack. An engine failure & pack failure was on the cards, but, at least the failure didn't look like an impact on the #1 engine. (in LAX, that occurred via a ricochet of a fragmented and liberated disk, but it is not going to happen airborne unless you really have not been living cleanly)

(the white bit at 3 OClock is the fill layer, outside of the ballistic wrap, and it looks like it has flopped forward. It extends forward further than it would with the nacelle annulus... the detail inspection will show what it did better than this musing).

Last edited by fdr; 22nd Feb 2021 at 05:26.
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Old 22nd Feb 2021, 05:24
  #113 (permalink)  
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I'm assuming Denver Hawaii is perhaps only ~half range of this aircraft. Also flights are not going anywhere near full, so guessing nowhere close to full fuel load.
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Old 22nd Feb 2021, 06:15
  #114 (permalink)  
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The initial comms from the cockpit is cringeworthy.... they got on the ground safely but to be a fly on the wall in that cockpit would be eye-opening I reckon.

And silverstrata; your lack of knowledge about procedures on the other end of the radio is the same.
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Old 22nd Feb 2021, 06:30
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Question...what is fueling that fire? Surely it must be possible to shot fuel off to that engine?
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Old 22nd Feb 2021, 06:35
  #116 (permalink)  
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Over 200 passengers on board with all their bags.
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Old 22nd Feb 2021, 07:26
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The proposed AD covers PW4000 models with the 112" fan (PW4074 to PW4098) and apart from United will primarily affect JAL, ANA, Asiana and Korean.
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Old 22nd Feb 2021, 07:46
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Anyone got a link to the EAD? I can't seem to find it on the FAA website, thank you.
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Old 22nd Feb 2021, 07:52
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How joined up would your radio call be if you got a fire warning while making it, while at the same time trying to figure out if someone else is transmitting on the forty other frequencies in use that you can't hear?
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Old 22nd Feb 2021, 09:24
  #120 (permalink)  

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A couple of comments refer to engine Fire rather than Severe Damage. When you listen to the ATC recording the flight crew reported an Engine Failure, not Fire which would be correct because the cowling separated from the engine so the fire warning light would not be triggered.
How would that affect the 777 checklist items after pulling the fire switch?
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