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United pushes back the return of dozens of Boeing 777 jets until at least May 13

United Airlines doesn't expect to fly dozens of Boeing 777 jets, grounded more than a year ago after one suffered an engine failure, until at least mid-May. The airline had most recently planned for at least some of the planes to return to service this month. United's Pratt & Whitney-powered 777s were taken out of service after an engine failure shortly after takeoff from Denver in early 2021. United Airlines doesn't expect to fly dozens of Boeing 777 jets, grounded more than… ( 기타...

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mbrews 20
All other operators of PW powered 777s , built in the late 1990's have RETIRED them from service.

- Having closely watched the details of the spectacular PW 4077 engine failures, IMO I choose to place those United 777 birds on my personal no-fly list.

- Adding to concerns with United's P&W-powered wide bodies are the two failures of PW 4060 engines over the Atlantic on United's 767-300s in the last 14 days.
Your personal no fly list? LOL! Drama queen much?
No one is stopping you from playing Russian Roulette with your life!
As an old Materials Engineer with 50 plus years NDT experience a lot having to do with turbine failures, I said some time ago that the push to design larger and larger engines while cutting materials tolerances, especially on rotating parts in order to achieve better fuel economy would lead to more inflight failures, it looks good on paper, but stress is stress and metal fatigue is ever present in the operating environment
mbrews 1
Ken, yes materials cumulative stress / cycles are at the heart of the matter. These titanium fan blades were touted as state-of-the art when introduced around year 1995. AFAIK, the specific engine type 4077 has not been in production for quite some while. A poster at a different website suggested an Internet search term for Cold Dwell Fatigue. From October 2021. it discusses life-limiting factors in aircraft engine titanium alloys.
I applaud United. They are making sure the Jets are safe before they return them to duty and that is what aviation needs right now. Safety.
mbrews -1
Well that’s your opinion. fair enough. I personally don’t know what specifically triggered the delay. Other groups outside of United might have exercised influence. To say wait-a-while before return-to-service Such as FAA, Pratt, pilots union? Maybe the recent set of PW 4060 failures is prompting a review of other systemic reliability issues?
Boeing has been going through a lot of bad situations in the last few years and it seems there is not going to be a quick solution for them. The Airline industry has a long memory which also won't help.
mbrews 18
Well, my no-fly choice is not because of Boeing's mis-steps. It's that United Airlines seems to have made a flawed assumption, that it could continue to operate its oldest 777s indefinitely. With the assumption that aging PW 4077 engines could be kept in "maintainable condition " forever.

Engine failure frequencies are starting to resemble the bad=old days of Allegiant's MD-80s, only now it may affect older Boeing wide bodies on oceanic ETOPS routes !! Would like to be a fly on the wall in United's pilot lounge

IMO, PW 4000 series Fan blade failures have become all too commonplace, including now the fan blades on PW 4060.

I study differences in human cognitive and communications abilities. Your initial post about older PW engines was factual and logical. The follow-up post by avionik99 was a non-specific emotional "bash Boeing" statement. The difference in the two posts demonstrates the dramatic difference in people's abilities.
mbrews 5
Mark, I would disagree. Nothing about abilities. It's more about motivations to post or comment. Some use the site to swap meaningful industry information.

Since it's an open, unmoderated forum, many others use the site exactly as they do with twitter. Free expression ? Maybe. Irritating some times ? Sure.
boughbw 2
It is not widely known that airframes and engines can be considered separately. I appreciate mbrews' tone in discussing the matter - factual, specific, and accompanied by examples ; but not really attacking avionik99.
SorenTwin -3
I study mating behaviors of endangered turtles. Stay on topic.
Yes Karen
Ed Step 6
The airline selects the engines not Boeing.
who needs 2 engines when you can fly with one :-) What could possibly go wrong here.?


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