September11
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Hole On A-300 Engine - How?

Wed Dec 09, 2009 5:06 pm

A hole is seen on the engine in the picture below.


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Photo © Paulo Carvalho



What happened? Did the engine turbine blew up?
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Fly2HMO
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RE: Hole On A-300 Engine - How?

Wed Dec 09, 2009 8:54 pm

Hmmm, it does look at about the right spot for the LP turbine disc to be found, though im surprised that, if it really was only one blade, the whole thing didn't have a catastrofic failure due to imbalance.
 
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tb727
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RE: Hole On A-300 Engine - How?

Thu Dec 10, 2009 12:16 am

Probably threw a piston.  Smile
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fr8mech
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RE: Hole On A-300 Engine - How?

Thu Dec 10, 2009 12:54 am

Isn't that where the 'king latch' lives on the cowl?

I'd say there is a 99.99% probabilty that this is NOT a turbine failure. One blade and the whole engine would've come apart.
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FlyingColours
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RE: Hole On A-300 Engine - How?

Thu Dec 10, 2009 1:17 am

According to the AAIB (UK Air Accidents Investigation Branch) it was...

"The origin of the engine failure was established to be separation of an HPT Stage 2 rotor blade, which had broken off just above the blade platform. The fracture had propagated from the edge of a 0.25" deep notch, which had been worn in the blade leading edge. Similar notches were found on all of the Stage 2 blades. Several HPT Stage 2 nozzle segments around the 12 o'clock position were found to have large cracks in the aerofoil to outer platform fillet. The cracking had weakened the cantilevered nozzle segments and allowed them to deform rearwards under aerodynamic loading and contact the leading edges of the Stage 2 blades."

The full report can be found here,
http://www.aaib.gov.uk/publications/...1___airbus_a300b4_605r__g_mons.cfm

Phil
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avt007
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RE: Hole On A-300 Engine - How?

Thu Dec 10, 2009 3:49 am

The loss of a blade, either compressor or turbine, will not cause a catastrophic failure. On the RR Speys, we had to check regularly to see if any LP Turbine blades were missing.
 
tdscanuck
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RE: Hole On A-300 Engine - How?

Thu Dec 10, 2009 4:11 am



Quoting Fr8Mech (Reply 3):
One blade and the whole engine would've come apart.

I think you're mixing discs and blades. A blade loss isn't all that uncommon and, aside from damaging neighboring blades, the engine generally survives. A turbine disc failure, on the other hand, is very probably going to take out the engine.

Tom.
 
fr8mech
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RE: Hole On A-300 Engine - How?

Thu Dec 10, 2009 11:22 pm



Quoting Tdscanuck (Reply 6):
I think you're mixing discs and blades.

No, not really. Just never seen or heard of a turbine blade, or cluster of blades, being liberated, radially, without trashing the engine. First time for everything.
When seconds count...the police are minutes away.
 
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HAWK21M
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RE: Hole On A-300 Engine - How?

Fri Dec 11, 2009 8:53 am

Interesting.
Any more pics of this particular Incident from another angle.
regds
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ex52tech
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RE: Hole On A-300 Engine - How?

Tue Dec 15, 2009 5:32 am



Quoting Fr8Mech (Reply 7):
No, not really. Just never seen or heard of a turbine blade, or cluster of blades, being liberated, radially, without trashing the engine. First time for everything.

Found a blade missing from the 4th stage of the LP on a CF-6-50C2 one night, no one wrote anything up , no vibration, no anything. But an uncontained failure like that usually is noticed in the cockpit, high EGT or vibration ect...If that was an HP blade, I find it hard to believe that they didn't notice, and performance didn't fall off.
"Saddest thing I ever witnessed....an airplane being scrapped"

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