# Airworthiness Directives; ATR-GIE Avions de Transport Régional Airplanes
> **Rule** · Final rule; request for comments. · Published 2017-12-18 · Effective 2018-01-02 · 82 FR 59963
## Document
- **Document number:** 2017-26949
- **Category:** airworthiness
- **Manufacturer:** ATR-GIE Avions de Transport Régional
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 82 FR 59963
- **Publication date:** 2017-12-18
- **Effective date:** 2018-01-02
- **FAA docket:** Docket No. FAA-2017-1170
## Abstract

We are adopting a new airworthiness directive (AD) for certain ATR-GIE Avions de Transport R[eacute]gional Model ATR42-300 and -500 airplanes and Model ATR72-202 and -212A airplanes. This AD requires identifying the serial number of the dual distributor valve (DDV), and replacement of affected DDVs. This AD was prompted by an investigation performed on a failed DDV that revealed a nonconformity of crimping on an internal valve. We are issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2017/12/18/2017-26949/airworthiness-directives-atr-gie-avions-de-transport-rgional-airplanes)
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