# Airworthiness Directives; Boeing Model 737, 747, 757, and 767 Series Airplanes
> **Rule** · Final rule; request for comments. · Published 1998-02-04 · Effective 1998-02-19 · 63 FR 5725
## Document
- **Document number:** 98-2529
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 63 FR 5725
- **Publication date:** 1998-02-04
- **Effective date:** 1998-02-19
- **FAA docket:** Docket No. 97-NM-334-AD
## Abstract

This amendment supersedes an existing airworthiness directive (AD), applicable to certain Boeing Model 737, 747, 757, and 767 series airplanes, that currently requires a one-time operational test of the pilots' seat locks and the seat tracks to ensure that the seats lock in position and the seat tracks are aligned correctly; and re-alignment of the seat tracks, if necessary. This amendment revises the applicability of the existing AD. The actions specified in this AD are intended to prevent uncommanded movement of the pilots' seats during acceleration and take-off of the airplane, and consequent reduced controllability of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1998/02/04/98-2529/airworthiness-directives-boeing-model-737-747-757-and-767-series-airplanes)
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