Mike , there is a number of service bulletins issued by continental and lycoming on calendar extensions and the reasoning behind.
lycoming Si 1009aw service instruction Engine deterioration in the form of corrosion (rust) and the drying out and hardening of composition materials such as gaskets, seals, flexible hoses and fuel pump diaphragms can occur if an engine is out of service for an extended period of time. Due to the loss of a protective oil film after an extended period of inactivity, abnormal wear on soft metal bearing surfaces can occur during engine start. Therefore, all engines that do not accumulate the hourly period of TBO specified in this publication are recommended to be overhauled in the twelfth year. Continental SL 98-9E i CM recommends the following factors be used, along with the engine’s published TBO, to determine the engine’s continued airworthiness: 1. Environmental corrosion occurs internally and externally on an engine. This naturally occurring process can affect continued airworthiness of the engine and engine mounted components or accessories. Regardless if the engine has been operated regularly or has been in storage; gaskets, seals, and synthetic and natural rubber goods deteriorate over time. Replace or overhaul the engine no later than the operating hours or number of years for the engine model listed in Table 1 on page 3. Just hope they don't bring in the Ag limitations for towing. regards Peter Heath ---- Mike Borgelt <mborg...@borgeltinstruments.com> wrote: ============= There's a nasty rumour going around that CASA is thinking of removing the calendar life exemptions on piston engines and going for a 10 calendar year overhaul life. Talked about on pprune and last weekend at the airfield one of the owners had heard about it from elsewhere. Could impact cost of launching quite significantly. Anyone heard any more? Mike Borgelt Instruments - design & manufacture of quality soaring instrumentation since 1978 www.borgeltinstruments.com tel: 07 4635 5784 overseas: int+61-7-4635 5784 mob: 042835 5784 : int+61-42835 5784 P O Box 4607, Toowoomba East, QLD 4350, Australia _______________________________________________ Aus-soaring mailing list Aus-soaring@lists.internode.on.net To check or change subscription details, visit: http://lists.internode.on.net/mailman/listinfo/aus-soaring
