# Airworthiness Directives; Lycoming Engines (L)O-360, (L)IO-360, AEIO-360, O-540, IO-540, AEIO-540, (L)TIO-540, IO-580, and IO-720 Series Reciprocating Engines.
> **Rule** · Final rule. · Published 2006-09-29 · Effective 2006-11-03 · 71 FR 57407
## Document
- **Document number:** E6-15958
- **Category:** airworthiness
- **Manufacturer:** Lycoming
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 71 FR 57407
- **Publication date:** 2006-09-29
- **Effective date:** 2006-11-03
- **FAA docket:** Docket No. FAA-2006-24785
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain Lycoming Engines (L)O-360, (L)IO-360, AEIO-360, O-540, IO-540, AEIO-540, (L)TIO-540, IO-580, and IO-720 series reciprocating engines. This AD requires replacing certain crankshafts. This AD results from reports of 23 confirmed failures of similar crankshafts in Lycoming Engines 360 and 540 series reciprocating engines. We are issuing this AD to prevent failure of the crankshaft, which will result in total engine power loss, in-flight engine failure, and possible loss of the aircraft.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2006/09/29/E6-15958/airworthiness-directives-lycoming-engines-lo-360-lio-360-aeio-360-o-540-io-540-aeio-540-ltio-540)
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