# Airworthiness Directives; Turbomeca Makila 1 A2 Turboshaft Engines
> **Rule** · Final rule; request for comments. · Published 2006-04-05 · Effective 2006-05-05 · 71 FR 16992
## Document
- **Document number:** 06-3253
- **Category:** airworthiness
- **Manufacturer:** Turbomeca Makila 1 A2 Turboshaft
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 71 FR 16992
- **Publication date:** 2006-04-05
- **Effective date:** 2006-05-05
- **FAA docket:** Docket No. FAA-2006-24239
## Abstract

The FAA is adopting a new airworthiness directive (AD) for Turbomeca Makila 1 A2 turboshaft engines. This AD requires upgrading the software version of the digital electronic control. This AD results from Turbomeca determining that Makila 1 A2 turboshaft engines with software version 9 installed in the digital electronic control unit (DECU), under certain conditions, could experience a free turbine overspeed and uncontained failure. We are issuing this AD to prevent overspeed and uncontained failure of the free turbine and damage to the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2006/04/05/06-3253/airworthiness-directives-turbomeca-makila-1-a2-turboshaft-engines)
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