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UA Flight returns to EWR after dropping debris on takeoff 21 Sept 2022

UA Flight returns to EWR after dropping debris on takeoff 21 Sept 2022

Old Sep 22, 22, 8:10 am
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UA Flight returns to EWR after dropping debris on takeoff 21 Sept 2022


https://twitter.com/aviationbrk/status/1572857395545624576
United 777 returns safely to Newark Airport following a technical issue, reportedly a problem with its hydraulics. A photo appeared on social media of suspected falling debris from the aircraft.
Anyone know more?
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Old Sep 22, 22, 8:21 am
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UA 149 to GRU diverted. Circled over the atlantic for a little over an hour
https://flightaware.com/live/flight/...305Z/KEWR/KEWR
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Old Sep 22, 22, 9:40 am
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N787UA. Same plane that had to be evacuated earlier this month in Amsterdam. I know stuff happens but it sure seems UA is experiencing more issues than normal right now.
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Old Sep 22, 22, 9:41 am
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Originally Posted by zeus2120 View Post
N787UA. Same plane that had to be evacuated earlier this month in Amsterdam. I know stuff happens but it sure seems UA is experiencing more issues than normal right now.
That's weird. I didn't even check the tail number. Previous issue was due to smoke in the cabin, right?
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Old Sep 22, 22, 11:52 am
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Sparks fly from United flight before emergency landing at Newark airport
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Old Sep 22, 22, 12:38 pm
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Looks like something being liberated from the air driven hydraulic pump exhaust port.
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Old Yesterday, 11:41 am
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Originally Posted by mduell View Post
Looks like something being liberated from the air driven hydraulic pump exhaust port.
nice technical answer. Can you tell us a bit more? Im an A&P but only worked on light aircraft. So does the hydraulic pump for landing gear work off of bleed air? Looks like a failure of the impeller or something along those lines. I am curious.
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Old Yesterday, 12:08 pm
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Originally Posted by tryathlete View Post
nice technical answer. Can you tell us a bit more? Im an A&P but only worked on light aircraft. So does the hydraulic pump for landing gear work off of bleed air? Looks like a failure of the impeller or something along those lines. I am curious.
I haven't flown the 777 so don't know the specifics of its systems. What I've heard, suggests that it is similar to the 767's system.

On the 767, the center hydraulic system has the high-load items, gear and flaps, and is powered by three pumps. Two electric pumps which run all the time and a third air-driven demand pump (ADP) which runs only when demand exceeds the capability of the two main pumps. The ADP is powered by pneumatic pressure and will normally run during gear retraction, which is consistent with the phase of flight in the video.

On the 767, if the ADP is deferred, there is a rather severe weight penalty on takeoff (several thousand pounds). The penalty is because the gear retraction cycle will be a lot slower which will affect the climb angle in the event of an engine failure during takeoff and a lighter weight is required to maintain the applicable safety margin.
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Old Yesterday, 3:09 pm
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If you haven't watched any of the VASAviaton videos in the past, check out the one they did on UA149. It includes the video and ATC traffic


Some of these recent incidents remind me of COdbaUA canceling INTL flights left and right due to a variety of mx issues in 2014 and 2015.

Consolidated "Delayed/Cancelled" International Flights (2014)

Consolidated "Delayed/Cancelled" International Flights (2015)

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