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Hi Guys,
As I mentioned in the Rigging thread I have a F22A with the above engine fitted which is due a 400 hr check (the first one from new! ) in about 38 hours time. The aircraft was layed up for several years for various reasons hence the low hours. The check is as a result of a Lycoming Service bulletin which apparently applies to all 300 series engines and consists of removing the rocker covers , releasing the valve gear and then measuring the "play" in the valve guides / stems with a dial guage. If within limits ok but if outside the minimum requirement ( providing they don't find anything else!) is new guides and a set of exhaust valves and parting with a lot of dosh!
Doe's anyone know the likely failure rate for these checks? I am being told by one licensed engineer that in his experience "most if not all fail" I cannot personally beleive this as these series engines were fitted to the Cesna 150 / 152 / 172? series and I can't beleive that flying schools would have stuck with them for so many years if that was the case? would the laid up state be likely to have any effect on likely failure?
Regards,
Bob Preston swansea Wales UK
As I mentioned in the Rigging thread I have a F22A with the above engine fitted which is due a 400 hr check (the first one from new! ) in about 38 hours time. The aircraft was layed up for several years for various reasons hence the low hours. The check is as a result of a Lycoming Service bulletin which apparently applies to all 300 series engines and consists of removing the rocker covers , releasing the valve gear and then measuring the "play" in the valve guides / stems with a dial guage. If within limits ok but if outside the minimum requirement ( providing they don't find anything else!) is new guides and a set of exhaust valves and parting with a lot of dosh!
Doe's anyone know the likely failure rate for these checks? I am being told by one licensed engineer that in his experience "most if not all fail" I cannot personally beleive this as these series engines were fitted to the Cesna 150 / 152 / 172? series and I can't beleive that flying schools would have stuck with them for so many years if that was the case? would the laid up state be likely to have any effect on likely failure?
Regards,
Bob Preston swansea Wales UK
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