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JesseCasserly
Topic Author
Posts: 23
Joined: Mon Aug 10, 2009 9:05 pm

Dent Appears in Engine Cowling During Spool-Up

Wed Mar 04, 2020 8:59 am

https://youtu.be/DQfbTj0y6-U?t=42

This is totally new to me, I can't for the life of me figure out what caused this!
 
DartHerald
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Re: Dent Appears in Engine Cowling During Spool-Up

Wed Mar 04, 2020 9:05 am

is it an optical illusion, or does this plane only carry "British Airways" lettering on one side? (as well as the dent!)
 
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N14AZ
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Re: Dent Appears in Engine Cowling During Spool-Up

Wed Mar 04, 2020 9:06 am

I first thought it's just an optical illusion, i.e. a shadow rushing over the cowling but I think I am wrong.
 
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scbriml
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Re: Dent Appears in Engine Cowling During Spool-Up

Wed Mar 04, 2020 9:12 am

DartHerald wrote:
is it an optical illusion, or does this plane only carry "British Airways" lettering on one side? (as well as the dent!)


The titles are there - they're mainly hidden by the wing, but at 00:37 in the video, you can see the "ays" above the engine.

I don't see any dent, just a reflection.
Time flies like an arrow. Fruit flies like a banana!
There are 10 types of people in the World - those that understand binary and those that don't.
 
StTim
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Re: Dent Appears in Engine Cowling During Spool-Up

Wed Mar 04, 2020 9:19 am

Not an illusion to me. Seems like there must be a vacuum behind the cowl there and it sucked in the outer layer(s). Obviously at take off power settings there is reduced pressure in the inlet (hence the water vapour that is often seen on spool up) but this shouldn't affect the rest of the nacelle.
 
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scbriml
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Re: Dent Appears in Engine Cowling During Spool-Up

Wed Mar 04, 2020 9:48 am

scbriml wrote:
I don't see any dent, just a reflection.


Having just rewatched the video on my desktop PC, yes a dent does appear.
Time flies like an arrow. Fruit flies like a banana!
There are 10 types of people in the World - those that understand binary and those that don't.
 
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N14AZ
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Re: Dent Appears in Engine Cowling During Spool-Up

Wed Mar 04, 2020 9:58 am

I think G-YMMA has to visit a dentist rather quickly... :duck:
 
Max Q
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Re: Dent Appears in Engine Cowling During Spool-Up

Wed Mar 04, 2020 10:42 am

This must have been a tag on inter island ‘hop’ judging by the short take off roll
The best contribution to safety is a competent Pilot.


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mmo
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Re: Dent Appears in Engine Cowling During Spool-Up

Wed Mar 04, 2020 11:55 am

The dent is not what I would cause "huge". But when the thrust levers are advanced and the engine spools up, there is a low-pressure area that is created in the fan section. The structure itself is made up of honeycombed material and a lining for the inside of the intake. All it is, most likely, is the honeycombed structure has begun to deteriorate and the low pressure area is putting stress on the honeycombed layer which is deforming the exterior of the cowl. Not a real big deal really as the pressure differential will get less as the airspeed increases.
If we weren't all crazy we'd all go insane!
 
oldannyboy
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Re: Dent Appears in Engine Cowling During Spool-Up

Wed Mar 04, 2020 11:57 am

Pretty scary! Could this be some FOD being sucked in, and in turn being thrown against the internal lining of the nacelle, fracturing it, and hence having the engine 'suck in' the outer cowl?
 
Wacker1000
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Joined: Tue Jan 07, 2014 6:36 pm

Re: Dent Appears in Engine Cowling During Spool-Up

Wed Mar 04, 2020 12:23 pm

That is a huge area of delamination on the inlet cowl.
 
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CarbonFibre
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Re: Dent Appears in Engine Cowling During Spool-Up

Wed Mar 04, 2020 1:17 pm

BA are aware of the problem according to a post on FlyerTalk.
 
dopplerd
Posts: 105
Joined: Fri Jul 01, 2016 7:30 pm

Re: Dent Appears in Engine Cowling During Spool-Up

Wed Mar 04, 2020 1:39 pm

I once saw the same effect on an AA 757 on take off. The dimpled area returned to normal after the engine power was reduced during climb out.
 
superbizzy73
Posts: 110
Joined: Wed Sep 30, 2009 5:43 am

Re: Dent Appears in Engine Cowling During Spool-Up

Wed Mar 04, 2020 4:37 pm

Just a side question...is there always that much debris on the runways there? Looks like they cleaned the runway off pretty good at rotation. Seems like a bad area to be in take off or full reverse thrust to have all that on the runway.
 
889091
Posts: 208
Joined: Sat Apr 06, 2019 7:56 pm

Re: Dent Appears in Engine Cowling During Spool-Up

Thu Mar 05, 2020 3:54 pm

The pilots shut down the affected engine and continued to their destination using the remaining good engine..... :rotfl:
 
LOT767SP-LPA
Posts: 140
Joined: Tue May 07, 2002 5:55 pm

Re: Dent Appears in Engine Cowling During Spool-Up

Thu Mar 05, 2020 5:17 pm

It looks like an oil can effect due to difference of pressure inside and outside of the fan cowl inlet panel. And It may mean that the skin in the bay is weak due to fatigue stress.
 
AAPramugari14
Posts: 26
Joined: Tue Mar 27, 2018 1:35 am

Re: Dent Appears in Engine Cowling During Spool-Up

Thu Mar 05, 2020 5:24 pm

I had this happen on a flight I worked a couple of years ago... 757-200.. turns out when we landed there was a cracked pipe that caused negative pressure within the engine essentially making a vacuum. Plane required an engine change.

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