1)Even money on an assembly error.
2)Ten to one it is either an inclusion or stress concentration from machining that missed inspection.
3) Fifty to one on bad design of the shaft or supports. (not including poor design for assembly which is included in number one)
No odds on the solution being overkill :
This is not a solicitation for bets.
Cheers
I do, but it will come out soon enough.
Yes, therefore I would not engage in useless speculation that it must be only one of those reasons, parts in metallurgy fail for variety of reasons, some of them have no relation to oiling, cooling, etc.
I don't need a link. I am looking at the engine now. Just not at liberty to fully discuss it yet thats all. If you would rather I didn't say anything, well that is ok too.
After 45 years in the turbine engine business, I've probably seem just about everything that caused a failure including TF41 FOD caused by ingestion of a sailor's Mickey Mouse ears when he was sucked in and then spit back out the A-7 duct by the engine stall and only suffered minor bruises.
Cheers
he looked seriously dazed and confused coming out
After 45 years in the turbine engine business, I've probably seem just about everything that caused a failure including TF41 FOD caused by ingestion of a sailor's Mickey Mouse ears when he was sucked in and then spit back out the A-7 duct by the engine stall and only suffered minor bruises.
Cheers
That is a classic. My only direct knowledge of FOD is that a Brown pelican and the intake of a GE T58-10 are incompatible.
The very first engine I worked on was the T58 in the CH-3C and UH-1F. Flew the H-3 as part of some all weather testing for about 30 Sec and decided Helos were not my cup of tea, at least as a pilot.
Cheers
That would be enough reason to get a rotor rating. Even the cheapest helicopter is more expensive than my 310 in both investment and cost of hourly operation.
I just can't justify a helicopter, but to meet my short term needs of personal flight to meet my short range commuting needs, I can use a backpack fan parachute rig really well.
I would love to have a Sea King.
Until the fuel truck rolled up......
I know, there is no way I have figured out to justify a turbine for personal use, not unless you have enough money to pay cash for what ever comes along with six figure price tags; or pretty expensive power by the hour type usage schemes, not to call that as a bad thing. In many situations I think they're pretty high value.
A bit windy to swim under, though.
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Well right now the cause is being called "Surface Contamination." Corrosion is what most of us would say, but it looks like it is coming from new coating that was on the forward end of the mid-fan shaft. Looks like the new coating is holding moisture. Last I heard the were NDT tesing all the shafts in the field, but then heard we were going to be changing them....and then there was this.............
