# Airworthiness Directives; Pilatus Aircraft Ltd. Airplanes
> **Rule** · Final rule. · Published 2021-03-30 · Effective 2021-05-04 · 86 FR 16509
## Document
- **Document number:** 2021-06514
- **Category:** airworthiness
- **Manufacturer:** Pilatus
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 86 FR 16509
- **Publication date:** 2021-03-30
- **Effective date:** 2021-05-04
- **FAA docket:** Docket No. FAA-2020-0917
## Abstract

The FAA is adopting a new airworthiness directive (AD) for all Pilatus Aircraft Ltd. (Pilatus) Model PC-24 airplanes. This AD was prompted by a report that electronic circuit breakers (ECBs) were found in a locked state after maintenance, but before flight. This AD requires revising the airplane flight manual (AFM) to incorporate a procedure to check for the ECB status. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2021/03/30/2021-06514/airworthiness-directives-pilatus-aircraft-ltd-airplanes)
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