# Airworthiness Directives; Aerospatiale Model ATR42 and ATR72 Series Airplanes
> **Rule** · Final rule; request for comments. · Published 1999-05-04 · Effective 1999-05-19 · 64 FR 23766
## Document
- **Document number:** 99-10644
- **Category:** airworthiness
- **Manufacturer:** Aerospatiale Model ATR42 and ATR72 Series
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 64 FR 23766
- **Publication date:** 1999-05-04
- **Effective date:** 1999-05-19
- **FAA docket:** Docket No. 99-NM-50-AD
## Abstract

This amendment adopts a new airworthiness directive (AD) that is applicable to all Aerospatiale Model ATR42 and ATR72 series airplanes. This action requires revising the Airplane Flight Manual to provide the flightcrew with modified procedures and limitations for operating in severe icing conditions. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified in this AD are intended to prevent the airplane from stalling due to prolonged exposure to severe icing conditions, which could result in reduced performance and controllability of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/05/04/99-10644/airworthiness-directives-aerospatiale-model-atr42-and-atr72-series-airplanes)
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