# Proposed AD 97-NM-45-AD: Boeing Model 737-100, -200, -300, -400, and -500 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 98-02-01
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 25, 1997, 62 FR 34185
- Comments due: July 21, 1997
- Became: [AD 98-02-01](https://openairdocs.org/ad/98-02-01)
- Docket: 97-NM-45-AD
- FR document: 97-16569
- Official PDF: https://openairdocs.org/files/sha256/9e/36/9e3669bf2372241f14862d670f6a359e6e0cc965a681f34448398cbc47e3ad97 (from https://www.govinfo.gov/content/pkg/FR-1997-06-25/pdf/97-16569.pdf)
- Federal Register: https://www.federalregister.gov/documents/1997/06/25/97-16569/airworthiness-directives-boeing-model-737-100--200--300--400-and--500-series-airplanes
- Page: https://openairdocs.org/proposed/97-NM-45-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to all Boeing Model 737-100, -200, - 300, -400, and -500 series airplanes. This proposal would require removing the yaw damper coupler; replacing its internal rate gyroscope with a new or overhauled unit; and performing a test to verify the integrity of the yaw damper coupler, and repair, if necessary. This proposal is prompted by an FAA determination that requiring replacement of the internal rate gyroscope will significantly increase the reliability of the yaw damper coupler system. The actions specified by the proposed AD are intended to prevent sudden uncommanded yawing of the airplane due to potential failures within the yaw damper system, and consequent injury to passengers and crewmembers.

## Notices in this docket

- Jun 25, 1997: Notice of proposed rulemaking (NPRM). (first notice), FR document 97-16569, comments due Jul 21, 1997 (https://www.federalregister.gov/documents/1997/06/25/97-16569/airworthiness-directives-boeing-model-737-100--200--300--400-and--500-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.