# Airworthiness Directives; Airbus Airplanes
> **Rule** · Final rule. · Published 2017-07-24 · Effective 2017-08-28 · 82 FR 34251
## Document
- **Document number:** 2017-14923
- **Category:** airworthiness
- **Manufacturer:** Airbus
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 82 FR 34251
- **Publication date:** 2017-07-24
- **Effective date:** 2017-08-28
- **FAA docket:** Docket No. FAA-2016-9393
## Abstract

We are superseding Airworthiness Directive (AD) 2013-13-16 for all Airbus Model A330-200, A330-200 Freighter, A330-300 series airplanes; and all Airbus Model A340-200, -300, -500, and -600 series airplanes. AD 2013-13-16 required repetitive inspections for discrepancies of the ball-screw assembly of the trimmable horizontal stabilizer actuator (THSA), repetitive greasing of the THSA ball-nut, and replacement of the THSA if necessary; and modification or replacement (as applicable) of the ball-nut assembly, which ends certain repetitive inspections. This new AD requires an inspection, corrective actions if necessary, lubrication of the ball-nut, modification of the THSA, and removal of certain airplanes from the applicability. This AD was prompted by a determination that a modification that automatically detects failure of the ball-screw assembly is necessary. We are issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2017/07/24/2017-14923/airworthiness-directives-airbus-airplanes)
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