# Proposed AD FAA-2014-0540: Lycoming Engines Reciprocating Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2015-02-07
- Products: Lycoming Engines
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: September 11, 2014, 79 FR 54218
- Comments due: November 10, 2014
- Became: [AD 2015-02-07](https://openairdocs.org/ad/2015-02-07)
- Docket: FAA-2014-0540 (https://www.regulations.gov/docket/FAA-2014-0540, where comments are filed)
- Project: 2014-NE-10-AD
- FR document: 2014-21675
- Official PDF: https://openairdocs.org/files/sha256/10/6c/106c1e4a28d76e4bf6a6f66ee77d0dc2beab6402b072072b1280cfa1b3288f10 (from https://www.govinfo.gov/content/pkg/FR-2014-09-11/pdf/2014-21675.pdf)
- Federal Register: https://www.federalregister.gov/documents/2014/09/11/2014-21675/airworthiness-directives-lycoming-engines-reciprocating-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/EDCDF23CFB7EB44E86257D500044F5B8.0001
- Page: https://openairdocs.org/proposed/FAA-2014-0540

## Summary

We propose to adopt a new airworthiness directive (AD) for certain serial number Lycoming Engines reciprocating engines. This proposed AD was prompted by events of propeller governor shaft set screws coming loose due to improper installation, which could result in engine oil loss, damage to the engine, and damage to the airplane. This proposed AD would require application of Loctite 290, or equivalent, to the threads of the propeller governor shaft set screw at each installation of the set screw in addition to the peening of crankcase hole threads. We are proposing this AD to prevent the propeller governor shaft set screw from coming loose, causing damage to the engine, and damage to the airplane.

## Notices in this docket

- Sep 11, 2014: Notice of proposed rulemaking (NPRM). (first notice), FR document 2014-21675, comments due Nov 10, 2014 (https://www.federalregister.gov/documents/2014/09/11/2014-21675/airworthiness-directives-lycoming-engines-reciprocating-engines)

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