# Airworthiness Directives; Aerospatiale Model ATR72 Series Airplanes
> **Rule** · Final rule. · Published 1999-02-23 · Effective 1999-03-30 · 64 FR 8712
## Document
- **Document number:** 99-4217
- **Category:** airworthiness
- **Manufacturer:** Aerospatiale Model ATR72 Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 64 FR 8712
- **Publication date:** 1999-02-23
- **Effective date:** 1999-03-30
- **FAA docket:** Docket No. 98-NM-118-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Aerospatiale Model ATR72 series airplanes, that requires a one-time inspection to detect damage of certain anchor nuts located on the upper surface of the wings, and replacement of the anchor nuts with new or serviceable nuts, if necessary. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to prevent failure of anchor nuts on the upper surface of the wings, which could result in reduced structural integrity of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/02/23/99-4217/airworthiness-directives-aerospatiale-model-atr72-series-airplanes)
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