# Proposed AD 97-NM-127-AD: British Aerospace (Jetstream) Model 4101 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 97-11-02 R1
- Action: Notice of proposed rulemaking (NPRM).
- Published: October 14, 1997, 62 FR 53272
- Comments due: November 10, 1997
- Became: [AD 97-11-02 R1](https://openairdocs.org/ad/97-11-02-R1)
- Docket: 97-NM-127-AD
- FR document: 97-27091
- Official PDF: https://openairdocs.org/files/sha256/17/1d/171d0fc2b3f7a05e1b872a42874ed95f38060443593060f1f14429eb998b2b9c (from https://www.govinfo.gov/content/pkg/FR-1997-10-14/pdf/97-27091.pdf)
- Federal Register: https://www.federalregister.gov/documents/1997/10/14/97-27091/airworthiness-directives-british-aerospace-jetstream-model-4101-airplanes
- Page: https://openairdocs.org/proposed/97-NM-127-AD

## Summary

This document proposes to revise an existing airworthiness directive (AD), applicable to certain British Aerospace (Jetstream) Model 4101 airplanes, that currently requires an inspection to determine the thickness of the intercostal that attaches the third crew member seat to the floor structure in the flight compartment, and replacement, if necessary. That AD was prompted by a report from the manufacturer indicating that intercostals have been installed that are not of sufficient thickness (and consequent strength) to support the third crew member seat during emergency landing dynamic conditions. The actions specified by that AD are intended to prevent the failure of this intercostal during an emergency landing, which could consequently result in injury to the flight crew. This action would revise the applicability of the existing AD by removing several airplanes.

## Notices in this docket

- Oct 14, 1997: Notice of proposed rulemaking (NPRM). (first notice), FR document 97-27091, comments due Nov 10, 1997 (https://www.federalregister.gov/documents/1997/10/14/97-27091/airworthiness-directives-british-aerospace-jetstream-model-4101-airplanes)

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