# Airworthiness Directives; Pilatus Aircraft Ltd. Airplanes
> **Rule** · Final rule. · Published 2021-12-09 · Effective 2022-01-13 · 86 FR 69996
## Document
- **Document number:** 2021-26544
- **Category:** airworthiness
- **Manufacturer:** Pilatus
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 86 FR 69996
- **Publication date:** 2021-12-09
- **Effective date:** 2022-01-13
- **FAA docket:** Docket No. FAA-2021-0573
## Abstract

The FAA is adopting a new airworthiness directive (AD) for Pilatus Aircraft Ltd. (Pilatus) Model PC-12/45, PC-12/47, and PC-12/47E airplanes with Supplemental Type Certificate (STC) SA00634DE installed. This AD was prompted by a report of strake attachment brackets and the fuselage frame failing at the upper most bracket attachment location. This AD requires inspecting the strake, attachment brackets, surrounding structure, and bolts and replacing components and repairing damage if necessary. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2021/12/09/2021-26544/airworthiness-directives-pilatus-aircraft-ltd-airplanes)
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