# Proposed AD FAA-2008-0935: Turbomeca Arriel 2B and 2B1 Turboshaft Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2009-01-11
- Products: Turbomeca
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: October 30, 2008, 73 FR 64566
- Comments due: December 1, 2008
- Became: [AD 2009-01-11](https://openairdocs.org/ad/2009-01-11)
- Docket: FAA-2008-0935 (https://www.regulations.gov/docket/FAA-2008-0935, where comments are filed)
- Project: 2008-NE-28-AD
- FR document: E8-25887
- Official PDF: https://openairdocs.org/files/sha256/1b/e7/1be794ba31553cede957c379b87037c880ff7934cc9a35d0178c7025873f3225 (from https://www.govinfo.gov/content/pkg/FR-2008-10-30/pdf/E8-25887.pdf)
- Federal Register: https://www.federalregister.gov/documents/2008/10/30/E8-25887/airworthiness-directives-turbomeca-arriel-2b-and-2b1-turboshaft-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/01AD19ED7EC6AB22862574F2004AD4C8.0001
- Page: https://openairdocs.org/proposed/FAA-2008-0935

## 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:

Several cases of loss of internal components from the Hydro Mechanical Unit (HMU) low fuel pressure switch Hydra-Electric part number (P/N) 9 550 17 956 0 into the fuel system, have been reported on Arriel 2 engines. The loss of internal components from the low fuel pressure switch into the fuel system may lead to a rupture of the HP-LP pumps drive shaft shear pin, and thus to a possible uncommanded in-flight shutdown (IFSD). On a single-engine helicopter, an uncommanded IFSD results in an emergency autorotation landing and in certain conditions may lead to an accident.

We are proposing this AD to prevent forced autorotation landing, oran accident.

## Notices in this docket

- Oct 30, 2008: Notice of proposed rulemaking (NPRM). (first notice), FR document E8-25887, comments due Dec 1, 2008 (https://www.federalregister.gov/documents/2008/10/30/E8-25887/airworthiness-directives-turbomeca-arriel-2b-and-2b1-turboshaft-engines)

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