# Proposed AD 99-NM-106-AD: Airbus Model A319, A320, and A321 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 99-23-09
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 28, 1999, 64 FR 34579
- Comments due: July 28, 1999
- Became: [AD 99-23-09](https://openairdocs.org/ad/99-23-09)
- Docket: 99-NM-106-AD
- FR document: 99-16334
- Official PDF: https://openairdocs.org/files/sha256/72/18/72189b4865fcc48af0237e8adde09982c0ef8ca0ce9594225b5472d4b2432fa5 (from https://www.govinfo.gov/content/pkg/FR-1999-06-28/pdf/99-16334.pdf)
- Federal Register: https://www.federalregister.gov/documents/1999/06/28/99-16334/airworthiness-directives-airbus-model-a319-a320-and-a321-series-airplanes
- Page: https://openairdocs.org/proposed/99-NM-106-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Airbus A319, A320, and A321 series airplanes. This proposal would require modification of the electro-distributor for the nose wheel steering servo-control. This proposal is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by the proposed 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.

## Notices in this docket

- Jun 28, 1999: Notice of proposed rulemaking (NPRM). (first notice), FR document 99-16334, comments due Jul 28, 1999 (https://www.federalregister.gov/documents/1999/06/28/99-16334/airworthiness-directives-airbus-model-a319-a320-and-a321-series-airplanes)

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