# Airworthiness Directives; Turbomeca S.A. Turboshaft Engines
> **Rule** · Final rule; request for comments. · Published 2013-03-06 · Effective 2013-03-21 · 78 FR 14442
## Document
- **Document number:** 2013-04996
- **Category:** airworthiness
- **Manufacturer:** Turbomeca S.A. Turboshaft
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 78 FR 14442
- **Publication date:** 2013-03-06
- **Effective date:** 2013-03-21
- **FAA docket:** Docket No. FAA-2011-1037
## Abstract

We are superseding an existing airworthiness directive (AD) for all Turbomeca S.A. Makila 1A2 turboshaft engines. That AD currently requires replacement of certain serial number (S/N) N2 sensor harnesses. This AD requires replacement of the same S/N harnesses, and requires replacement of additional S/N N2 sensor harnesses. This AD was prompted by corrosion detected in affected N2 sensor harnesses. We are issuing this AD to prevent inadvertent activation of the 65% N1 back up mode, resulting in N2 speed fluctuation, significant power loss, and emergency landing of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2013/03/06/2013-04996/airworthiness-directives-turbomeca-sa-turboshaft-engines)
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