# Proposed AD 99-NM-27-AD: British Aerospace Model BAe 146 and Avro 146-RJ Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 99-22-11
- Action: Notice of proposed rulemaking (NPRM).
- Published: July 7, 1999, 64 FR 36626
- Comments due: August 6, 1999
- Became: [AD 99-22-11](https://openairdocs.org/ad/99-22-11)
- Docket: 99-NM-27-AD
- FR document: 99-17178
- Official PDF: https://openairdocs.org/files/sha256/20/60/2060503c0321333c15776893bec1b63116eb0dacdec6dabf278f9399c8dc21d5 (from https://www.govinfo.gov/content/pkg/FR-1999-07-07/pdf/99-17178.pdf)
- Federal Register: https://www.federalregister.gov/documents/1999/07/07/99-17178/airworthiness-directives-british-aerospace-model-bae-146-and-avro-146-rj-series-airplanes
- Page: https://openairdocs.org/proposed/99-NM-27-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to all British Aerospace model BAe 146 and Avro 146-RJ series airplanes. This proposal would require installation of modified roller sub-assemblies in both the main landing gear (MLG) door lock and the MLG uplock. 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 failure of the roller sub-assemblies, which could result in failure of the MLG to retract and lock after takeoff, or to deploy properly for landing.

## Notices in this docket

- Jul 7, 1999: Notice of proposed rulemaking (NPRM). (first notice), FR document 99-17178, comments due Aug 6, 1999 (https://www.federalregister.gov/documents/1999/07/07/99-17178/airworthiness-directives-british-aerospace-model-bae-146-and-avro-146-rj-series-airplanes)

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