# Proposed AD 99-NM-309-AD: British Aerospace (Jetstream) Model 4101 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2000-02-21
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 24, 1999, 64 FR 66121
- Comments due: December 27, 1999
- Became: [AD 2000-02-21](https://openairdocs.org/ad/2000-02-21)
- Docket: 99-NM-309-AD
- FR document: 99-30632
- Official PDF: https://openairdocs.org/files/sha256/30/f5/30f59dcab68aee5f8664a7a1eab241f941163372c42010813e0b06f88383433f (from https://www.govinfo.gov/content/pkg/FR-1999-11-24/pdf/99-30632.pdf)
- Federal Register: https://www.federalregister.gov/documents/1999/11/24/99-30632/airworthiness-directives-british-aerospace-jetstream-model-4101-airplanes
- Page: https://openairdocs.org/proposed/99-NM-309-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to all British Aerospace (Jetstream) Model 4101 airplanes. This proposal would require manufacture and installation of a placard on the left-hand instrument panel in the cockpit to prohibit push-backs of the airplane while the engines are running. In lieu of accomplishing the placard installation, this proposal would require repetitive installation of a new tow bracket sub-assembly that has the serial number and date of installation vibro etched on it. 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 fatigue failure of the towing bracket. Failure of the towing bracket could cause a towing vehicle to collide into the propeller while the airplane engines are running, and consequently, cause damage to the airplane, and injure ground personnel, flight crew, or passengers.

## Notices in this docket

- Nov 24, 1999: Notice of proposed rulemaking (NPRM). (first notice), FR document 99-30632, comments due Dec 27, 1999 (https://www.federalregister.gov/documents/1999/11/24/99-30632/airworthiness-directives-british-aerospace-jetstream-model-4101-airplanes)

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