Airworthiness Directive · Amendment 39-9150 · Continental Motors Engines
Continental Motors Engines
This AD applies to Continental Motors IO-346-A, IO-346-B, IO-520-C, IO-520-CB, IO-550-C.
The models as the FAA's AD index lists them. The serial ranges, installed parts and exceptions are in the AD itself: read it at the FAA.
This amendment supersedes an existing airworthiness directive (AD), applicable to certain Teledyne Continental Motors (TCM) IO-346, IO-520, and IO-550 series reciprocating engines, that currently 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 that airworthiness directive (AD). This amendment clarifies the identification procedures to determine which engine mount brackets must be inspected. This amendment is prompted by reports that the engine mount bracket part numbers, which are ink stamped, can be easily obliterated. The actions specified by this AD are intended to prevent engine separation from the aircraft due to cracks in the engine mount brackets.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
