FLY2HMO From , joined Dec 1969, posts, RR:
Reply 1, posted (5 years 1 month 3 weeks 2 days 20 hours ago) and read 3022 times:
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.
FlyingColours From United Kingdom, joined Dec 2003, 2315 posts, RR: 10
Reply 4, posted (5 years 1 month 3 weeks 2 days 15 hours ago) and read 2878 times:
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."
Tdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80
Reply 6, posted (5 years 1 month 3 weeks 2 days 12 hours ago) and read 2818 times:
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.
Ex52tech From United States of America, joined Dec 2006, 559 posts, RR: 1
Reply 9, posted (5 years 1 month 2 weeks 4 days 11 hours ago) and read 2101 times:
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"