# Airworthiness Directives; Sikorsky Aircraft Corporation Helicopters
> **Rule** · Final rule. · Published 2020-02-07 · Effective 2020-03-13 · 85 FR 7191
## Document
- **Document number:** 2020-02446
- **Category:** airworthiness
- **Manufacturer:** Sikorsky
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 85 FR 7191
- **Publication date:** 2020-02-07
- **Effective date:** 2020-03-13
- **FAA docket:** Docket No. FAA-2019-0663
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain Sikorsky Aircraft Corporation (Sikorsky) Model S-70, S-70A, S- 70C, S-70C(M), and S-70C(M1) helicopters. This AD was prompted by four incidents of disbonding between the tail rotor (T/R) blade pitch horn and the torque tube. This AD requires recurring visual and tap inspections of the T/R blade, and depending on the outcome, replacing the T/R blade. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2020/02/07/2020-02446/airworthiness-directives-sikorsky-aircraft-corporation-helicopters)
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