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lightsaber
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LEAP bearing issue

Thu Jun 13, 2019 3:17 pm

There is a leap bearing (or is it a seal? Hard to tell) issue:

http://m.aviationweek.com/[primary-term]/cfm-tackles-drive-shaft-bearing-issue-leap-1b-engine

How does LEAP have 5 in flight shutdowns and not get the attention other engines did?

Does anyone have information not behind a paywalk?

I suspect this is first showing up on the LEAP-1B due to little details on bearing speed and cooling. The LEAP went with lower differential hearing speed than the PW1100G to minimize risk, but both went beyond the known. Pratt has vonta-rotation which spins these bearings faster.

FWIW, RPM needs to increase a further 30% for optimization of the compressor. Even more for the turbine efficiency.

Lightsaber
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scbriml
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Re: LEAP bearing issue

Thu Jun 13, 2019 3:43 pm

lightsaber wrote:
How does LEAP have 5 in flight shutdowns and not get the attention other engines did?


IMHO, CFM has done a much better job than PW in keeping their LEAP bad news away from the public eye. It seems to me that most people think LEAP has been pretty much flawless while GTF has been an unmitigated disaster.
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par13del
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Re: LEAP bearing issue

Thu Jun 13, 2019 3:48 pm

So how does CFM do that when the airlines are actually using the engines?
When IFSD's occur, the airlines are required to file official reports, if the media does not pick those up are we suggesting that CFM is paying the media to not publish bad news?
At least we know that no A.Net members are on any media staff, based on our SOP's, the PW folks would be blowing this news up all over the world.
 
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GCT64
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Re: LEAP bearing issue

Thu Jun 13, 2019 3:58 pm

I was initially a bit confused as to how an issue could arise on an engine model that is not even in use at the moment because of the MAX grounding but this comes from late 2018.

“Late last year we had several events where in the cockpit crews noticed a delta pressure across the oil filters causing them to shut the engines down,” CFM EVP Allen Paxson said. “We later found out we were generating particles from the radial drive shaft on a group of engines, so we quickly put an inspection on the screen itself.” (screens being the transfer gearbox modules scavenge screens)

Basically the AD mandates recurring inspections of the screens which will be resolved when replaced with the re-designed bearing in the radial drive.
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Sooner787
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Re: LEAP bearing issue

Thu Jun 13, 2019 4:25 pm

Guess this also might explain why the CFM deliveries to Boeing Renton fell behind ?
 
Mat1776
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Re: LEAP bearing issue

Thu Jun 13, 2019 4:40 pm

How do the IFSDs affect the ETOPS operation of the MAXes when they return to flight operation?
 
AA737-823
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Re: LEAP bearing issue

Thu Jun 13, 2019 7:04 pm

Okay, everyone, keep those tin foil hats firmly ensconced upon your crowns.
Meanwhile, back in reality land, the LEAP has had some teething issues, yes. Between bypass doors pinned open and this issue, there have been a few hiccups.
But it's STILL practically WEEKLY than an A320neo in India blows an engine.
And that's even after the "improvements" made to the engine turned out to be just as bad as the originals.

So, yeah, from this armchair, the Pratt problems are significantly bigger than the LEAP.
 
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mfranjic
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Re: LEAP bearing issue

Fri Jun 14, 2019 8:43 pm


lightsaber wrote:
…How does LEAP have 5 in flight shutdowns and not get the attention other engines did?

Does anyone have information not behind a paywall? …


……..…Image


scbriml wrote:
lightsaber wrote:
How does LEAP have 5 in flight shutdowns and not get the attention other engines did?

IMHO, CFM has done a much better job than PW in keeping their LEAP bad news away from the public eye. It seems to me that most people think LEAP has been pretty much flawless while GTF has been an unmitigated disaster.


...Completely true, scbriml… It is also well known that the CFM International was much more aggressive than the Pratt & Whitney in providing guarantees and economic concessions in GTF - LEAP competitions.

Mario
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SteelChair
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Re: LEAP bearing issue

Fri Jun 14, 2019 10:03 pm

The value of the brand. GE and CFM don't come under the same level of scrutiny as lesser companies....it really is that simple. There is a reason why CFM won their market segment so convincingly. And in fact, don't they have an advantage over the GTF in head to head competition even though their engine burns more fuel?
 
smartplane
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Re: LEAP bearing issue

Fri Jun 14, 2019 11:33 pm

And GE has always included strong confidentiality clauses with consequences, though RR has been a quick learner, while PW play tail-end charlie by a country mile.
 
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zeke
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Re: LEAP bearing issue

Sat Jun 15, 2019 10:58 am

lightsaber wrote:
How does LEAP have 5 in flight shutdowns and not get the attention other engines did?


I suspect by having spare engines. The public does not become aware of these issues unless an AD is issued, or aircraft start sitting on the ground for extended periods of time.

Having spare engines gets aircraft back in the air quickly.
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BrianWilkes
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Re: LEAP bearing issue

Sat Jun 15, 2019 11:12 am

This whole MAX thing is a mess!
 
trex8
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Re: LEAP bearing issue

Sat Jun 15, 2019 4:29 pm

Why isnt the IA affected also?? Isnt the fan size the only major difference??

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