Uncontained engine failure at YSSY
Shivers down spine... Can't find the story anywhere except Facebook.
China Southern MU736 uncontained engine failure after take off from YSSY at 9.30 EST tonight. No other details except cowling totally breeched. |
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That's ahead of the fan! Would blades come off and forward? In all that inward airflow?
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Isn't there supposed to be a kevlar blanket around the circumference of the fan to contain loose blades ??
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And China Southern is spelled on fuselage more like Eastern/Western ?
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MU is China Eastern
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China Eastern, SYDNEY-SHANGHAI, returned immediately https://flightaware.com/live/flight/CES736
https://scontent-syd2-1.xx.fbcdn.net...ce&oe=59D7A898 ATC https://mobile.twitter.com/S118869/s...77703119720449 |
Hard to see for sure but those engines use to suffer from acoustic lining cowl failure.
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Looks identical to this EGYPTAIR incident less than 1 month ago, both powered by T700, both left hand engine
Incident: Egypt A332 at Cairo on May 15th 2017, rejected takeoff due to engine failure |
Possibilities are
primary failure of the inlet cowl and ingestion into the engine Primary failure of a large part of a blade and parts ejected forward (mechanically) Closeup evidence would certainly have confirmed which one came first. So no use guessing from casual photos |
All of MU's A330s are fitted with Rolls-Royce Trent 700s.
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I suspect cowl play.
All over the news on tv this morning. Have to love the news with lines line this : A China Eastern flight from Sydney to Shanghai has been forced to turn around after its flight crew noticed a hole in the plane's engine just moments after taking off. Strange, doesnt look like there is any damage to the blades... https://au.news.yahoo.com/nsw/a/3589...failure/#page1 |
Flight Radar shows event took place between the airport and Hornsby Heights.
Presumably it didn't occur within airport boundary or we would be seeing pictures of the debris? If it occurred outside the boundary, is it likely the debris will be discovered and reported by members of the public? |
Event occured just after rotation according to the ATC tapes.
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Originally Posted by logansi
(Post 9799258)
Looks identical to this EGYPTAIR incident less than 1 month ago, both powered by T700, both left hand engine
Incident: Egypt A332 at Cairo on May 15th 2017, rejected takeoff due to engine failure http://www.pprune.org/rumours-news/2...xb-18-oct.html |
As the failure is on the inboard side - what happened to the portside fuselage?
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Maybe it was harmonic resonance. ;)
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Did somebody cry cowl! Looks like separation of the cowl.....
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well, they did get a video chat from the engine! What is wrong with the press?!?!? I listened and I heard visual check, not video chat.......
I bet that the inspection and repair requirements of the cowl on that engine has been moved up! http://services.casa.gov.au/airworth...011-0173R1.pdf |
Extermally, there is some resemblance tp 44 years ago: https://www.ntsb.gov/investigations/...ts/AAR7502.pdf
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Ahh, it's a nacelle failure, NOT an engine failure :ugh:
Originally Posted by jaytee54
(Post 9799217)
That's ahead of the fan! Would blades come off and forward? In all that inward airflow?
Can't you see that a significant part of the first stage low pressure compressor fan appears intact along with the spinner? If you remember anything about convergent flow in ducts, you will remember that the static pressure in an accelerating stream of fluid/air flow drops compared to that of the freestream (external/adjacent to the cowl opening). There is a net suction inside the lip of the nacelle/cowl opening. It's highly likely that the material that separated from the forward cowl/shroud initially was sucked inward in relatively large pieces, making it less likely that pieces of any significant size were ingested into the engine core. Some smaller pieces of debris may in fact have passed through the bypass (cold air) section of the engine.
Originally Posted by Uplinker
(Post 9799220)
Isn't there supposed to be a kevlar blanket around the circumference of the fan to contain loose blades ??
Originally Posted by PAXboy
(Post 9799687)
As the failure is on the inboard side - what happened to the portside fuselage?
That may not be the case, especially if the relatively light structure which 'disappeared' was sucked in towards the centre of the cowl/shroud.
Originally Posted by jaytee54
(Post 9799217)
That's ahead of the fan! Would blades come off and forward? In all that inward airflow?
Originally Posted by underfire
(Post 9799693)
well, they did get a video chat from the engine! What is wrong with the press?!?!? I listened and I heard visual check, not video chat.......
I bet that the inspection and repair requirements of the cowl on that engine has been moved up! http://services.casa.gov.au/airworth...011-0173R1.pdf This AD goes back to 2011 with a revision in 2014. An Airbus SB afford inspection and subsequent modification action. One wonders if the airline has evidence of compliance with the ADs/SBs? |
A piece from the Guardian on the matter:
https://www.theguardian.com/world/20...-engine-casing Some better images here: https://au.news.yahoo.com/nsw/a/3589...failure/#page1 |
Originally Posted by A30_737_AEWC
(Post 9799750)
One wonders if the airline has evidence of compliance with the ADs/SBs?
Presumably if they did, and it did cover the cowl too then it'd be down to RR to demonstrate compliance. Yes, I know it's part of the airframe, not part of the engine itself, I just don't know how much of the airframe is covered by RR's package. |
Is the hole near the wing root a normal air intake/landing light mounting position? Or has it been made by damage from the cowling disintegration? Hard to tell at the resolution in Post # 1.
I couldn't see it on a few other A330's parked here. Disregard. Found another photo showing it being a normal opening. |
From a different A330 Trent failure.. Ahh, it's a nacelle failure, NOT an engine failure It appears that the EgytpAir failure is virtually the same failure... failure is failure. |
Assuming this is a failure of the cowl, and not the fan, who's responsibility is it?
RR don't build the nacelle - or do they? |
Train for this over and over again. Fellas did a well rehearsed and competent job.
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Originally Posted by jaytee54
(Post 9799217)
That's ahead of the fan! Would blades come off and forward? In all that inward airflow?
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Don't flatter yourself and your engineering knowledge. Can't you see that a significant part of the first stage low pressure compressor fan appears intact along with the spinner? If you remember anything about convergent flow in ducts, you will remember that the static pressure in an accelerating stream of fluid/air flow drops compared to that of the freestream (external/adjacent to the cowl opening). There is a net suction inside the lip of the nacelle/cowl opening. It's highly likely that the material that separated from the forward cowl/shroud initially was sucked inward in relatively large pieces, making it less likely that pieces of any significant size were ingested into the engine core. Some smaller pieces of debris may in fact have passed through the bypass (cold air) section of the engine. The intake is a divergent duct. Convert ram effect to higher pressure and slower airflow. Basic engineering knowledge. But you knew that. |
Originally Posted by Arkroyal
(Post 9799998)
Since it's the fan pulling the aircraft forward, of course the fan blades go forward and outwards if released.
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In most photos you can see that at the top of the hole the remaining cowling is bent well outward - suggesting that most of the separated cowling passed over the top of the engine. Almost all of the other tearing seen also suggests this upward motion.
A look at the inside bottom of the hole also shows metal bent up - in that case, toward the engine. This is best seen 0:33 seconds into this video: https://au.news.yahoo.com/nsw/a/3589...failure/#page1 This suggest that the bottom of the separated cowling passed directly over the intake. It's hard to imagine (but possible) that none of it was ingested. |
Originally Posted by TURIN
(Post 9800003)
Back to school lad.
The intake is a divergent duct. Convert ram effect to higher pressure and slower airflow. Basic engineering knowledge. But you knew that. |
Originally Posted by mommus
(Post 9799904)
Assuming this is a failure of the cowl, and not the fan, who's responsibility is it?
RR don't build the nacelle - or do they? Of course, the problem could have been caused by a maintenance error, so the Australian Transport Safety Bureau will be checking this out. |
Originally Posted by barit1
(Post 9800079)
Basic engineering knowledge. Without a LOT of airspeed, and certainly around Vr, there ain't much ram effect. We used to call it ram recovery speed; works well for you later in climb & cruise.
What's the take off speed of a typical A330? |
Since it's the fan pulling the aircraft forward, of course the fan blades go forward and outwards if released Kind of like an airplane glider wing that breaks off a toy The forces driving the blade forward are friction like a skier on snow and only act at the tip surface |
So what happened?
I think we can agree now no fan blades left the engine and it was a failure of the cowling. Was this perhaps a panel not properly tightened?
A 'big bang' was heard by multiple different people on the ground over a Sydney suburb. (It's widely reported on social media), so we can assume the cowling went into the engine causeing failure? Me thinks this is a mantaince screw up. It would be interesting to see who last had hands on the cowling. |
A seemingly similiar incident also involving a Trent 772 engine happened about 4 weeks ago, see Incident: Egypt A332 at Cairo on May 15th 2017, rejected takeoff due to engine failure.
Possibly related there may be two Airworthiness Directives released by EASA, see 2011-0173R1 of Aug 21st 2014 and 2016-0086R1 of May 13th 2016. AD 2011-0173R1 reasons: "Two operators of A330 aeroplanes fitted with Rolls-Royce Trent 700 engines reported finding extensive damage to engine air intake cowls as a result of acoustic panel collapse, most probably caused by panel disbonding. This condition, if not detected and corrected, could lead to the detachment of the engine air intake cowl from the engine, possibly resulting in ingestion of parts by, and consequence damage to, the engine, or injury to persons on the ground." AD 2016-0086R1 reasons: "During shop visit, cracks were found in several primary structural parts of Rolls Royce (RR) Trent 700 engine air intake cowls, specifically in the forward bulkhead web, web stiffeners and outer boundary angles (OBA). In addition, several attachment links were found severely worn, and some became detached. In two cases, the thermal anti- ice (TAI) piccolo tube was found fractured. Investigation results show that the cracks are most likely due to acoustic excitation and vibration. A broken piccolo tube, if not detected and corrected, in conjunction with forward air intake cowl bulkhead damage, could lead to in-flight detachment of the outer barrel, possibly resulting in damage to the engine or reduced control of the aeroplane." |
Me thinks this is a mantaince screw up. It would be interesting to see who last had hands on the cowling. Some have suggested the cowl anti-ice PRV failed. I'm not so sure. :ok: |
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