# Proposed AD 98-NM-235-AD: British Aerospace Model Avro 146-RJ85A and RJ100A Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 98-21-07
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 13, 1998, 63 FR 43351
- Comments due: September 14, 1998
- Became: [AD 98-21-07](https://openairdocs.org/ad/98-21-07)
- Docket: 98-NM-235-AD
- FR document: 98-21714
- Official PDF: https://openairdocs.org/files/sha256/62/94/6294b316c549d3b4299a8ae128de9a1bda9fc43f6c2e60ca29a7702fd6c3af36 (from https://www.govinfo.gov/content/pkg/FR-1998-08-13/pdf/98-21714.pdf)
- Federal Register: https://www.federalregister.gov/documents/1998/08/13/98-21714/airworthiness-directives-british-aerospace-model-avro-146-rj85a-and-rj100a-series-airplanes
- Page: https://openairdocs.org/proposed/98-NM-235-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain British Aerospace Model Avro 146-RJ85A and RJ100A series airplanes. This proposal would require a one-time inspection for evidence of machining (undercutting) into the web of the integral stringers of the bottom skin of the wings, and corrective actions, if necessary. 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 reduced wing strength and stiffness, and the onset of premature fatigue cracking, which could result in reduced structural integrity of the airplane.

## Notices in this docket

- Aug 13, 1998: Notice of proposed rulemaking (NPRM). (first notice), FR document 98-21714, comments due Sep 14, 1998 (https://www.federalregister.gov/documents/1998/08/13/98-21714/airworthiness-directives-british-aerospace-model-avro-146-rj85a-and-rj100a-series-airplanes)

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