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Emirates A330 Fan Blade - DXB 18 Oct

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Emirates A330 Fan Blade - DXB 18 Oct

Old 25th Oct 2006, 13:19
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Quick question as perhaps i am misinformed. Are engine cowlings designed and tested to contain a blade shed event?
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Old 25th Oct 2006, 13:34
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Yep, bit like a catchers mitt, should hold it but if it doesn't it would be recorded as an error!
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Old 25th Oct 2006, 13:38
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Thanks Woodpecker, thought that was the case, just had not been mentioned until now.
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Old 25th Oct 2006, 16:26
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Originally Posted by howflytrg
Quick question as perhaps i am misinformed. Are engine cowlings designed and tested to contain a blade shed event?

No

The cowling is typically considered part of the aircraft and as such specified by the aircraft installer under part 25 of the regulation. It's function is to streamline airflow as well as to provide fire containment. there is no spedcification to provide containment of debris from the engine.

Lots more could be said about containment, within the engine.
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Old 25th Oct 2006, 21:18
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The fan CASE (part of the engine proper) must contain a fan blade failure - the blade will fly tangentially outboard and be trapped or bounced back inboard.

The outer cowl wraps around the case - like lomapaseo says.
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Old 29th Oct 2006, 12:32
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Some of the photos doing the rounds -
Picture 1
Pciture 2
Picture 3
Picture 4
Picutre 5
Fargoo

All the photos on one page
Photo page/
Can someone let me know if this works ok. ( The photos I mean )
Fargoo
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Old 29th Oct 2006, 13:08
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Both the page and photos work fine at least for me.

As for the subject, I can only say, Ouch!
Would be interesting to know what caused this
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Old 29th Oct 2006, 13:57
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Would it not be worth considering the reason for the go-around?
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Old 29th Oct 2006, 14:29
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Although the photos don't show much of the fan rotor blades, I don't see any evidence of damage there. Typical engineer's response - "More data please!"
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Old 29th Oct 2006, 14:34
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Snoop

Although the photos don't show much of the fan rotor blades, I don't see any evidence of damage there
My thoughts exactly, and also what I was told by one of the RR reps. Although to be fair the day it happened details were a bit sketchy to say the least.
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Old 29th Oct 2006, 14:39
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Originally Posted by barit1
Although the photos don't show much of the fan rotor blades, I don't see any evidence of damage there. Typical engineer's response - "More data please!"
When you enhance the photos you can pretty much see all the fan blades as undamaged (to the eye).

The fan rub strip also appears intact.

Surprising both inner and outer inlet cowl walls are failed. Typically they are not in the same load path.

All I could make out was overload type breakup at the forward ends. The inner sheet aft end is where I would have a closer look.

The amount of material missing is a concern. Much more and the cowl might not be able to survive manuever or air loading. Of course its still only equivalent to an engine out.

It would be interesting to hear of any follow up service bulletins resulting from this.
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Old 29th Oct 2006, 15:02
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I'm only an avionics man but all fan blades appear intact!
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Old 29th Oct 2006, 15:36
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Originally Posted by gas path
Not unknown for a fan blade annulus filler to depart company
However whether it would do that amount of damage
Looks like gaspath may be on the right track. I have no idea what annulus fillers weigh, can only guess what they do (fill an annulus) - and I don't know what they do when they let loose, but now I know what one looks like

http://www.chem-tronics.com/repairse...s/V25AF315.pdf
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Old 29th Oct 2006, 16:07
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Originally Posted by A380focal
But it thought:
All the blades, annulus fillers, and nose cone are still where they should be....
Is that so - A380? Well as you seem to know, please enlighten us all. Is this how it left the factory - or am I seeing something that's not there - literally.

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Old 29th Oct 2006, 17:14
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A Google search of "annulus filler" rendered this:

http://www.matcoinc.com/files/Public...ysisPart12.pdf -

"Case History #6. Aircraft Engine Failure
The fan section of a turbine aircraft engine contains fan blade separators known as annulus fillers, or simply as spacers. The material specification of an annulus filler is usually 7075 T56 aluminum alloy with a painted coating. The highlighted area in the drawing at left represents the annulus filler component, of which there are 22 in this engine. Annulus fillers are attached to an outer rim (rotor disc) by means of insertion."

Apparently, they simply keep the fan blade tips evenly spaced.

Cheers, y'all.

God, I'm beginning to love Google...
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Old 29th Oct 2006, 17:41
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forget;

What to you appears to be missing, (aside from the obvious cowling sections)? I've taken a look at the available photos and, while not conclusive in re annulus fillers, (unless that's the lighter areas between the blades in the photo you've posted), the blades appear in all photos to be intact, though in one photo taken from inboard the engine with almost all blades showing, there does appear to be some leading-edge blade damage...

Cheers,
PJ2
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Old 29th Oct 2006, 19:12
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Snoop

The lighter areas in the picture between the fan blades are the annulus fillers. EK have had an annulus filler let go before, ex GLA diverted to LHR for an engine change. The bright green bit in the picture is part of the nose cowl structure that the acoustic panels 'nail' to.
Now another pure guess here but possibly a failure of the inner barrel acoustic panels due to fatigue causing a heavy surge and subsequent failure of the outer skin. That would also account for damage to the blades.
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Old 30th Oct 2006, 12:34
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Originally Posted by Mudfoot
Apparently, they simply keep the fan blade tips evenly spaced.
The annulus fillers are merely aerodynamic fairings fitted between adjacent blades. They are there to make a smooth transition from the back of the spinner extension to the inlet of the IP compressor. They do not play a part in fan blade location.

The annulus fillers on the G2 weighed about 1 to 1.5 kg. I would guess that Trent 700 annulus fillers would have a mass nearer 2kg.
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Old 30th Oct 2006, 12:45
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Gents,
The rumour is pneumatics
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Old 30th Oct 2006, 14:25
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I have just been looking at this picture http://static.flickr.com/86/282208884_699a78990d_o.jpg

Note that the edges of the shattered cowling have been bent inwards towards the fan. It looks as though an object of some kind has smashed in from the outside. Very odd I must admit.
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