Lucky pilot

[astjp2]

I don’t think any inspection would have found the impending failure on this superior air parts 0-300/200/90/85 cylinder, 1400 total time, cylinder barrel actually broke. Compression was within limits and there was no previous indication of a barrel fatigue. Airplane flew 20 miles back to the airport.

[Hank Jarrett]

My mouth is very dry.

[astjp2]

My mouth is very dry.

Burbon would help that...just saying...

[PA1195]

Next to older Briggs & Stratton lawn mowers these have to be the toughest engines.

Gary

[astjp2]

Next to older Briggs & Stratton lawn mowers these have to be the toughest engines.

Gary

Yeah Gary, it was a lucky ride. If the barrel would have broke about another 1/4" lower, the wrist pin could have came out and seized the engine. That would have not been fun. Pilot flew it 20 miles to the airport with it broke...

[N96337]

Quite common on the R-985, so they wound up with a UT inspection at the head/barrel intersection area. I've seen hundreds that wouldn't pass the inspection. I saw a TSIO-520 do this one time on a Baron. As our cylinders increase in age and cycles, it's going to be more common, unfortunately.
John

[astjp2]

Quite common on the R-985, so they wound up with a UT inspection at the head/barrel intersection area. I've seen hundreds that wouldn't pass the inspection. I saw a TSIO-520 do this one time on a Baron. As our cylinders increase in age and cycles, it's going to be more common, unfortunately.
John

John, I dont consider 1400 hours old, they should go at least to overhaul...

[N96337]

I totally agree!!! Should be able to add at least one "0" to that before anything shows!

[Hank Jarrett]

Burbon would help that...just saying...

I am more of a Single Malt guy.

[astjp2]

I am more of a Single Malt guy.

Snob! Were you an academic? Hahaha

[Hank Jarrett]

No, a Scott!

[Scott]

I think this illustrates the importance of maintaining a clean engine.

It can be seen even in the photos that this cylinder was cracked (up to 50% or more of the circumference) for quite some time prior to the final failure. The oil and soot buildup on the intake components and ignition wires below the cylinder is a telltail sign that the cylinder has been blowing oil and hot gases for a while.

Keep your engine clean and free of oil leaks and you'll see an impending failure before it develops this far. Just my opinion of course

[Ragwing nut]

how old was that cylinder? There was a batch of superior cylinders that the barrels were not deburred correctly and popped a few heads. I think there is an old AD on it.

[Guest]

I think this illustrates the importance of maintaining a clean engine.

It can be seen even in the photos that this cylinder was cracked (up to 50% or more of the circumference) for quite some time prior to the final failure. The oil and soot buildup on the intake components and ignition wires below the cylinder is a telltail sign that the cylinder has been blowing oil and hot gases for a while.

Keep your engine clean and free of oil leaks and you'll see an impending failure before it develops this far. Just my opinion of course

Scott,

I don't see oil or soot build up like you do, are you seeing it on these pics? If so point me I am missing it, Thanks, Dave.

[Guest]

how old was that cylinder? There was a batch of superior cylinders that the barrels were not deburred correctly and popped a few heads. I think there is an old AD on it.

I looked for AD's but found only ones for big engines like IO520