Hi Torsten,

At 30 hours running certain parts of the engine will be worn out, either through mechanical wear or wear through errosion and stress, other parts of the engine will not be worn out in any way, it is perfectly feasable to 0 hour an engine by replacing any worn out parts and checking and testing any non worn out parts, then setting the engine back up to orig specification.

I have just had one of our field test engines returned to me after 274 cycles, a cycle being a start up run to operating temp and shut down, 250 of these cycles were flights of approx 10 mins duration the remainder were bench and demo runs, this engine is owned by Norm Thompson from Melbourne Australia, 6th in the World Jet Masters in Thailand (open class) the engine is still in running conditon and up to mid last week was being flown. On Monday this engine will be stripped down for assesment, then 0 houred and returned to him, I would expect Norm to get the same amount of runs and flying time from this engine, this is what I meant. I hope this answers your question.