# Airworthiness Directives; McDonnell Douglas Model DC-9-80 Series Airplanes
> **Rule** · Final rule. · Published 1996-03-04 · Effective 1996-04-03 · 61 FR 8208
## Document
- **Document number:** 96-4508
- **Category:** airworthiness
- **Manufacturer:** McDonnell Douglas Model DC-9-80 Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 61 FR 8208
- **Publication date:** 1996-03-04
- **Effective date:** 1996-04-03
- **FAA docket:** Docket No. 95-NM-118-AD
## Abstract

This amendment supersedes an existing airworthiness directive (AD), applicable to certain McDonnell Douglas Model DC-9-80 series airplanes, that currently requires inspection and replacement of certain suspect horizontal stabilizer primary trim motors. That AD was prompted by an analysis which revealed that certain incorrectly manufactured motor shafts could fail prematurely and, in turn, cause the primary trim motor to fail. The actions specified in that AD are intended to prevent such failures of the primary trim motor, which could ultimately result in reduced controllability of the airplane. This amendment expands the applicability of the existing AD to include additional affected airplanes.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1996/03/04/96-4508/airworthiness-directives-mcdonnell-douglas-model-dc-9-80-series-airplanes)
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