# Proposed AD FAA-2006-26570: Turbomeca S.A. Makila 1A and 1A1 Turboshaft Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2007-03-20
- Products: Turbomeca
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 19, 2006, 71 FR 75896
- Comments due: January 18, 2007
- Became: [AD 2007-03-20](https://openairdocs.org/ad/2007-03-20)
- Docket: FAA-2006-26570 (https://www.regulations.gov/docket/FAA-2006-26570, where comments are filed)
- Project: 2006-NE-39-AD
- FR document: E6-21586
- Official PDF: https://openairdocs.org/files/sha256/42/b9/42b9f87f198efea24891c1d9f71f933f977b24c7c2d1bfc3a52bd90a9e0865a6 (from https://www.govinfo.gov/content/pkg/FR-2006-12-19/pdf/E6-21586.pdf)
- Federal Register: https://www.federalregister.gov/documents/2006/12/19/E6-21586/airworthiness-directives-turbomeca-sa-makila-1a-and-1a1-turboshaft-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FB8CB958A2451CE18625724900566AAA.0001
- Page: https://openairdocs.org/proposed/FAA-2006-26570

## Summary

We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed AD results from mandatory continuing airworthiness information (MCAI) issued by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:

The back-up mode can be activated by an electrostatic discharge or by a malfunction of the collective pitch signal. The two engines fitted on the same helicopter can therefore be frozen in this back- up position at 85% N1.

Freezing both engines in the back-up mode can lead to an inability to continue safe flight and forced landing. The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.

## Notices in this docket

- Dec 19, 2006: Notice of proposed rulemaking (NPRM). (first notice), FR document E6-21586, comments due Jan 18, 2007 (https://www.federalregister.gov/documents/2006/12/19/E6-21586/airworthiness-directives-turbomeca-sa-makila-1a-and-1a1-turboshaft-engines)

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