Airworthiness Directives; Teledyne Continental Motors IO-346, IO- 520, and IO-550 Series Piston Engines

摘要

This amendment adopts a new airworthiness directive (AD), applicable to certain Teledyne Continental Motors (TCM) IO-346, IO-520, and IO-550 series piston engines, that requires initial and repetitive inspections of the engine mount brackets for cracks, and if found cracked, replacement with improved design engine mount brackets. All engine mount brackets require replacement with improved design engine mount brackets at the next engine removal after the effective date of this AD. This amendment is prompted by reports of cracks in engine mount brackets on engines that have completed at least one overhaul cycle. The actions specified by this AD are intended to prevent engine separation from the aircraft due to cracks in the engine mount brackets.