# Airworthiness Directives; Construcciones Aeronauticas, S.A. (CASA) Model CN-235 Series Airplanes
> **Rule** · Final rule. · Published 1998-06-15 · Effective 1998-07-20 · 63 FR 32605
## Document
- **Document number:** 98-15678
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 63 FR 32605
- **Publication date:** 1998-06-15
- **Effective date:** 1998-07-20
- **FAA docket:** Docket No. 98-NM-85-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain CASA Model CN-235 series airplanes, that requires modification of the forward beam of the vertical stabilizer by the installation of a structural reinforcement plate. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to prevent in-flight structural deformation or failure of the vertical stabilizer, resulting in reduced controllability of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1998/06/15/98-15678/airworthiness-directives-construcciones-aeronauticas-sa-casa-model-cn-235-series-airplanes)
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