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) requiring the removal from service of specific Superior Air Parts (SAP) and certain Lycoming O-360/IO-360 piston engine crankshafts.
- This proposed AD stems from multiple crankshaft failures between 2017 and 2018 that led to engine power loss and emergency landings, which the FAA attributes to fatigue cracking caused by an "excessive residual white layer" from the manufacturing process.
- Superior Air Parts is actively investigating the issue to determine the actual cause and intends to work with the FAA on the most logical course of action, while the FAA considers alternatives less onerous than immediate removal.
- The proposed AD would affect 115 US-registered aircraft and targets crankshafts produced by a specific SAP vendor between 2012 and 2014.
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