AD FAA-2015-0868

The FAA is withdrawing a notice of proposed rulemaking (NPRM). The NPRM proposed a new airworthiness directive (AD) that had applied to certain Lycoming Engines (type certificate formerly held by Textron Lycoming) with Superior Air Parts, Inc. (SAP), piston pins installed. The NPRM had applied to those engines using SAP piston pins, part number (P/N) 13444-1. The proposed action would have required removal of defective SAP piston pins, P/N 13444-1, from service. Since we issued the NPRM, we have learned that all the affected piston pins have been removed from service. We also found that SAP has revised its manufacturing process so that the subsequent piston pins were no longer susceptible to cracking. Accordingly, we withdraw the proposed rule.