# Airworthiness Directives; British Aerospace Model Avro 146-RJ85A and RJ100A Series Airplanes
> **Rule** · Final rule. · Published 1998-10-06 · Effective 1998-11-10 · 63 FR 53549
## Document
- **Document number:** 98-26390
- **Category:** airworthiness
- **Manufacturer:** British Aerospace Model Avro 146-RJ85A and RJ100A Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 63 FR 53549
- **Publication date:** 1998-10-06
- **Effective date:** 1998-11-10
- **FAA docket:** Docket No. 98-NM-235-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain British Aerospace Model Avro 146-RJ85A and RJ100A series airplanes, that requires 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 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 reduced wing strength and stiffness, and the onset of premature fatigue cracking, which could result in reduced structural integrity of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1998/10/06/98-26390/airworthiness-directives-british-aerospace-model-avro-146-rj85a-and-rj100a-series-airplanes)
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