# Proposed AD FAA-2021-0573: Pilatus Aircraft Ltd. Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2021-24-01
- Products: Pilatus
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: July 22, 2021, 86 FR 38613
- Comments due: September 7, 2021
- Became: [AD 2021-24-01](https://openairdocs.org/ad/2021-24-01)
- Docket: FAA-2021-0573 (https://www.regulations.gov/docket/FAA-2021-0573, where comments are filed)
- Project: 2018-CE-046-AD
- FR document: 2021-15469
- Official PDF: https://openairdocs.org/files/sha256/a2/33/a23358368b08a30d0a2e17f223828739ffb172c915830881db3338b506c9857b (from https://www.govinfo.gov/content/pkg/FR-2021-07-22/pdf/2021-15469.pdf)
- Federal Register: https://www.federalregister.gov/documents/2021/07/22/2021-15469/airworthiness-directives-pilatus-aircraft-ltd-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/139BD502AE4F07E88625871A007D2BCD.0001
- Page: https://openairdocs.org/proposed/FAA-2021-0573

## Summary

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

## Notices in this docket

- Jul 22, 2021: Notice of proposed rulemaking (NPRM). (first notice), FR document 2021-15469, comments due Sep 7, 2021 (https://www.federalregister.gov/documents/2021/07/22/2021-15469/airworthiness-directives-pilatus-aircraft-ltd-airplanes)

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