Re. Gypsy Majors. I spoke to propulsion Dept. at CAA recently to find out what action they might take regarding calendar life limits. If I understood the response correctly, lifing won't necessarily be 12 years as that figure is a manufacturer (Continental/Lycoming) specified number. No such age was specified by the Gypsy's manufacturer, hence CAA will deal with it by AD. This could in principle mean that the life limitation is <12, or >12. The recent failure mentioned by Mandator probably means that the AAIB recommendation following Stampe G-OODE losing its prop, will now be actioned by CAA following a period of consultation with 'the industry' ie us.
I was PIC for the recent failure - subject to AAIB investigation of course so don't want to speculate, but the engine is a wreck, and looking at the engine, the pessimist in me worries that there may be other implications as well - but calendar lifing is in my humble opinion, inevitable.