Superior Air Parts has responded to the FAA’s recent Notice of Proposed Rulemaking calling for an AD on its crankshafts for the SAP model O-360 and IO-360 piston engines, and certain Lycoming model AEIO-360, IO-360, and O-360 piston engines. The proposed AD would call for removal from service of affected crankshafts.
Superior Air Parts Responds to Crankshaft NPRM
Key Takeaways:
- The FAA has proposed an Airworthiness Directive (AD) calling for the removal of specific Superior Air Parts (SAP) crankshafts from O-360 and IO-360 engines (both SAP and certain Lycoming models) due to multiple reported fatigue-related failures.
- The failures, which resulted in engine power loss and emergency landings, were attributed by the FAA to an "excessive residual white layer" forming during the manufacturing process.
- Superior Air Parts is investigating the issue after recent notification and plans to work with the FAA to determine the actual cause and explore less drastic alternatives, such as periodic inspections, instead of immediate removal.
- The proposed AD targets 115 crankshaft assemblies produced by a specific vendor between 2012 and 2014, identified by particular part and serial numbers.
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