# Airworthiness Directives; Airbus Helicopters Deutschland GmbH
> **Rule** · Final rule; request for comments. · Published 2020-11-03 · Effective 2020-11-18 · 85 FR 69493
## Document
- **Document number:** 2020-24263
- **Category:** airworthiness
- **Manufacturer:** Airbus
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 85 FR 69493
- **Publication date:** 2020-11-03
- **Effective date:** 2020-11-18
- **FAA docket:** Docket No. FAA-2020-0919
## Abstract

The FAA is adopting a new airworthiness directive (AD) for all Airbus Helicopters Deutschland GmbH Model EC135P1, EC135P2, EC135P2+, EC135P3, EC135T1, EC135T2, EC135T2+, EC135T3, and EC635T2+ helicopters. This AD was prompted by reports of improper heat treatment of titanium (Ti)-bolts installed on the forward and aft tail rotor drive shafts, resulting in a broken Ti-bolt. This AD requires an inspection to determine if Ti-bolts installed on the forward and aft tail rotor drive shafts are affected parts, and replacement if necessary, as specified in a European Union Aviation Safety Agency (EASA) AD, which is incorporated by reference. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2020/11/03/2020-24263/airworthiness-directives-airbus-helicopters-deutschland-gmbh)
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