# Airworthiness Directives; Turbomeca S.A. Turboshaft Engines
> **Rule** · Final rule. · Published 2013-12-24 · Effective 2014-01-28 · 78 FR 77569
## Document
- **Document number:** 2013-30459
- **Category:** airworthiness
- **Manufacturer:** Turbomeca S.A. Turboshaft
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 78 FR 77569
- **Publication date:** 2013-12-24
- **Effective date:** 2014-01-28
- **FAA docket:** Docket No. FAA-2013-0557
## Abstract

We are adopting a new airworthiness directive (AD) for certain Turbomeca S.A. Arriel 1A1, 1A2, 1B, 1C, 1C1, 1C2, 1D, 1D1, 1E2, 1K1, 1S, and 1S1 turboshaft engines. This AD requires a one-time inspection of the free turbine (FT) module (M04) for the affected Turbomeca S.A. Arriel 1 engines and, if a discrepancy is found, repair of the affected module. This AD was prompted by a "chip illumination event" in flight on a Turbomeca S.A. Arriel 1 engine. We are issuing this AD to prevent a loss of FT bearing lubrication, resulting in FT module failure, damage to the engine, and damage to the aircraft.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2013/12/24/2013-30459/airworthiness-directives-turbomeca-sa-turboshaft-engines)
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