Metal Fatigue AD
The FAA took the action because of the failure of some 30 installed cylinders due to metal fatigue. ECi asked for the AD to allow affected cylinder assemblies to be removed at the normal engine operating time-between-overhaul, but the FAA stuck with its 800-hour limit. "The failure data records show that a longer operating time for the affected cylinder assemblies would jeopardize aircraft safety," the FAA said. AOPA said it was satisfied with the final form of the AD. With 30 incidents cited, "there was a clear indication of a problem," spokeswoman Kathleen Vasconcelos told AVweb. In contrast, AOPA vehemently opposed a recent proposed AD regarding ECi connecting rods, which was based on a single incident of failure.