# Airworthiness Directives; Airbus Model A319, A320, and A321 Series Airplanes
> **Rule** · Final rule. · Published 1999-11-12 · Effective 1999-12-17 · 64 FR 61480
## Document
- **Document number:** 99-29054
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 64 FR 61480
- **Publication date:** 1999-11-12
- **Effective date:** 1999-12-17
- **FAA docket:** Docket No. 99-NM-106-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Airbus Model A319, A320, and A321 series airplanes, that requires modification of the electro-distributor for the nose wheel steering servo-control. 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 uncommanded nose landing gear wheel rotation, due to defective seals in the wheel steering selector valve of the hydraulic control unit for the nose landing gear, which could result in reduced controllability of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/11/12/99-29054/airworthiness-directives-airbus-model-a319-a320-and-a321-series-airplanes)
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