# Proposed AD 97-NM-143-AD: British Aerospace Model 4100 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 98-05-07
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 24, 1997, 62 FR 67303
- Comments due: January 23, 1998
- Became: [AD 98-05-07](https://openairdocs.org/ad/98-05-07)
- Docket: 97-NM-143-AD
- FR document: 97-33510
- Official PDF: https://openairdocs.org/files/sha256/de/2a/de2ad2d777d1a956f0c53bc7c30022cbe18ec4baa4e269f8dd36818e6e1f06d1 (from https://www.govinfo.gov/content/pkg/FR-1997-12-24/pdf/97-33510.pdf)
- Federal Register: https://www.federalregister.gov/documents/1997/12/24/97-33510/airworthiness-directives-british-aerospace-model-4100-series-airplanes
- Page: https://openairdocs.org/proposed/97-NM-143-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain British Aerospace Model 4100 series airplanes. This proposal would require replacement of the stringer joint pieces at the left side of the fuselage with new, improved parts. 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 the fuselage structure at the stringer joint at station 130 on the left side of the airplane from cracking, which could result in rapid decompression of the airplane at the forward fuselage area.

## Notices in this docket

- Dec 24, 1997: Notice of proposed rulemaking (NPRM). (first notice), FR document 97-33510, comments due Jan 23, 1998 (https://www.federalregister.gov/documents/1997/12/24/97-33510/airworthiness-directives-british-aerospace-model-4100-series-airplanes)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.