# Airworthiness Directives; Airbus SAS Airplanes
> **Rule** · Final rule. · Published 2018-09-13 · Effective 2018-10-18 · 83 FR 46372
## Document
- **Document number:** 2018-19749
- **Category:** airworthiness
- **Manufacturer:** Airbus SAS
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 83 FR 46372
- **Publication date:** 2018-09-13
- **Effective date:** 2018-10-18
- **FAA docket:** Docket No. FAA-2018-0506
## Abstract

We are adopting a new airworthiness directive (AD) for certain Airbus SAS Model A350-941 airplanes. This AD was prompted by the discovery of inadequate corrosion protection in certain areas of the horizontal stabilizer and the rear fuselage cone structure. This AD requires application of sealant and protective treatment on the affected areas of the horizontal stabilizer and the rear fuselage cone structure and, for certain airplanes, modification of the trimmable horizontal stabilizer (THS) torsion box and re-identification of the elevator. We are issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2018/09/13/2018-19749/airworthiness-directives-airbus-sas-airplanes)
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