Roger Lee Posted March 14, 2013 Report Share Posted March 14, 2013 Hi All just an FYI, I did a 1000 hr. general maint. yesterday on an LS that is 2 years old. It does a lot of training and rentals. So we rebuilt the carbs. Several "O" rings were shot and had dry rot type multiple cracks and when they were removed just broke off. Otherwise they were clean. Why so much "O" ring cracks after only two years. It had nothing to do with just time alone, but the 1000 hrs of use and heating cycles and ethanol fuels may not have helped. Once your plane (any with a Rotax 912) gets to 6+ years you may think about all the "O" rings regardless of the hours. Check your carb drip trays at times for cracking on both the SW and the LS. One was completely broken through on the LS. The gearbox inspection and re-shim wasn't any issue and nothing was found there as far as wear and it was clean because it gets a fairly strict diet of 91 oct. I did install new Bellville washers. The Neuform prop was due to be inspected. It had cracks that went cross ways on the backs of the blades. In the black color they can be hard to see so look closely. It most likely was the gel coat, but without getting under the gel coat and sending it back to FD for an inspection who really knows. It would have been at least a $1000+ to get it re-done. We put a Sensenich 3 blade 68" prop on. No issues there and that's pretty straight forward. (If you ever need a Sensenich prop I can probably save you a couple of dollars). Just an FYI on what you may see or expect. Link to comment Share on other sites More sharing options...
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