# Airworthiness Directives; Airbus Model A330 and A340 Series Airplanes
> **Rule** · Final rule; request for comments. · Published 1998-01-13 · Effective 1998-01-28 · 63 FR 1909
## Document
- **Document number:** 98-312
- **Category:** airworthiness
- **Manufacturer:** Airbus Model A330 and A340 Series
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 63 FR 1909
- **Publication date:** 1998-01-13
- **Effective date:** 1998-01-28
- **FAA docket:** Docket No. 97-NM-314-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Airbus Model A330 and A340 series airplanes. This action requires repetitive operational tests of the override mechanism of the trimmable horizontal stabilizer (THS) to determine if the system functions correctly; and corrective action, if necessary. This amendment is prompted by the issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified in this AD are intended to prevent uncommanded movement of the THS, which could result in reduced controllability of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1998/01/13/98-312/airworthiness-directives-airbus-model-a330-and-a340-series-airplanes)
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