NPRM Concerning Superior Air Parts Crankshafts

14 CFR Part 39 [Docket No. FAA–2018–1077; Product Identifier 2018–NE–40–AD] RIN 2120–AA64 Airworthiness Directives; Superior Air Parts, Inc. (SAP) Engines and Lycoming Engines Reciprocating Engines With a Certain SAP Crankshaft Assembly AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice of proposed rulemaking (NPRM). 

SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD) for all SAP Model IO–360-series and O–360- series reciprocating engines and certain Lycoming Engines (Lycoming) Model AEIO–360-, IO–360-, and O–360-series reciprocating engines with a certain SAP crankshaft assembly installed. This SAP crankshaft assembly is installed as original equipment on the affected SAP engines and as a replacement part under parts manufacturer approval (PMA) on the affected Lycoming engines. 

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