# Airworthiness Directives; Airbus Model A330 and A340 Series Airplanes
> **Rule** · Final rule; request for comments. · Published 2001-06-11 · Effective 2001-06-26 · 66 FR 31143
## Document
- **Document number:** 01-13996
- **Category:** airworthiness
- **Manufacturer:** Airbus Model A330 and A340 Series
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 66 FR 31143
- **Publication date:** 2001-06-11
- **Effective date:** 2001-06-26
- **FAA docket:** Docket No. 2001-NM-135-AD
## Abstract

This amendment adopts a new airworthiness directive (AD) that is applicable to certain Airbus Model A330 and A340 series airplanes. This action requires repetitive inspections to detect discrepancies of the transfer tubes and the collar of the ball nut of the trimmable horizontal stabilizer actuator (THSA); and corrective action, if necessary. This action is necessary to prevent degraded operation of the THSA due to the entrance of water into the ball nut. Degraded operation could lead to reduced controllability of the airplane. This action is intended to address the identified unsafe condition.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2001/06/11/01-13996/airworthiness-directives-airbus-model-a330-and-a340-series-airplanes)
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