# Proposed AD FAA-2018-1077: Superior Air Parts, Inc. (SAP) Engines and Lycoming Engines Reciprocating Engines With a Certain SAP Crankshaft Assembly

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2020-25-12
- Products: Superior Air Parts
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: January 29, 2020, 85 FR 5173
- Comments due: March 16, 2020
- Became: [AD 2020-25-12](https://openairdocs.org/ad/2020-25-12)
- Docket: FAA-2018-1077 (https://www.regulations.gov/docket/FAA-2018-1077, where comments are filed)
- FR document: 2020-01414
- Official PDF: https://openairdocs.org/files/sha256/51/70/5170829a6695dd6f2870678d9a4d9455c97c29b7e9e374e484f8f4ae47adbb6d (from https://www.govinfo.gov/content/pkg/FR-2020-01-29/pdf/2020-01414.pdf)
- Federal Register: https://www.federalregister.gov/documents/2020/01/29/2020-01414/airworthiness-directives-superior-air-parts-inc-sap-engines-and-lycoming-engines-reciprocating
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/12E825E058237585862584FE004ED967.0001
- Page: https://openairdocs.org/proposed/FAA-2018-1077

## 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. This proposed AD was prompted by three crankshaft assembly failures that resulted in the loss of engine power and immediate or emergency landings. This proposed AD would require the removal from service of all affected crankshaft assemblies. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Jan 29, 2020: Notice of proposed rulemaking (NPRM). (first notice), FR document 2020-01414, comments due Mar 16, 2020 (https://www.federalregister.gov/documents/2020/01/29/2020-01414/airworthiness-directives-superior-air-parts-inc-sap-engines-and-lycoming-engines-reciprocating)

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