Those of us with IO-550N engines need to comply with a new airworthiness directive: 2004-8-10. Some of the cylinders installed on our engines may be from a batch which has been over-hardened, potentially leading to the formation of cracks. If found during inspection, these cylinders need to be replaced before further flight.
I’ve posted details including links to the AD and an ECi service bulletin on the Lancair forum.
I don’t have any word yet on the extent to which this will affect the SR-22 or Columbia fleets, if at all. But it poses a potentially significant safety issue and entails sending 6 cylinders back to Texas. I wonder if there’s any insight from the Cirrus owners on this one at this early stage?