orca
New Member
Posts: 7
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Post by orca on Jun 8, 2015 12:15:50 GMT -9
Has anyone experienced cylinder stud failures recently? We have had several (3) engines recently found with one or more cylinder mount studs sheared. One engine with an associated case crack emanating from one stud hole. Today we found another engine with similar cracking from upper cylinder mount stud into the case. The engine overhauler says they don't normally replace the studs at o'haul and they are NDT'd with the case at o'haual? Last year we had 2 engines where a cylinder was blown right off of the case with all mount studs sheared causing inflight shutdowns and other peripheral damage. So... we are starting to wonder what's going on??? We now carry out regular mount nut torque checks but still have found sheared studs. All recent incidents have been low-to-mid time engines.
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Post by Tim Glubaskas on Jun 10, 2015 5:29:29 GMT -9
We haven't experienced any issues such as yours - We have replaced a few through-bolts but nothing beyond.
Can I ask who you are currently using as an overhauler?
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orca
New Member
Posts: 7
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Post by orca on Jun 22, 2015 10:17:21 GMT -9
Orca has been using Pro Aero engines exclusively, Kamloops, BC, for many years. They have always provided good solid engines with little or no issues until recently. We operate our engines on hard time with replacement/overhaul at 2000 hrs. We have discussed our problems with them at length as well as a detailed break-down on the engines that the cylinders separated from the case with no anomalies found. We're starting to question our flight operations procedures, I.E. stage cooling, power applications, excessive powered ground run ups, etc. Still no root cause! Is prop balance a common procedure amongst many 540-J2BD operators? Do you think this might help?
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Post by navajoflyer on Jul 7, 2015 13:44:33 GMT -9
We had a situation like this a number of years ago. We traced it to a detonation problem being induced by one of our pilots who was aggressively leaning during climb out. The aircraft involved did not have any type of engine monitor installed and it turned out that the left TIT indication was inaccurate which lead our pilot to believe the mixture was richer than it really was.
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