# Proposed AD FAA-2020-0320: McCauley Propeller Systems Governors

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2020-19-06
- Products: McCauley Propeller Systems
- Product type: Appliance
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 7, 2020, 85 FR 19399
- Comments due: May 22, 2020
- Became: [AD 2020-19-06](https://openairdocs.org/ad/2020-19-06)
- Docket: FAA-2020-0320 (https://www.regulations.gov/docket/FAA-2020-0320, where comments are filed)
- FR document: 2020-07168
- Official PDF: https://openairdocs.org/files/sha256/77/e0/77e038e1e958b535c6a2c53e71ee055e5a79d17195b0121fdb27d4560e036a15 (from https://www.govinfo.gov/content/pkg/FR-2020-04-07/pdf/2020-07168.pdf)
- Federal Register: https://www.federalregister.gov/documents/2020/04/07/2020-07168/airworthiness-directives-mccauley-propeller-systems-governors
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7B2A4AE53D1A624D862585430045D0A4.0001
- Page: https://openairdocs.org/proposed/FAA-2020-0320

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain model McCauley Propeller Systems (McCauley) governors installed on airplanes. This proposed AD was prompted by reports of an unapproved variant McCauley idler gear bearing, part number (P/N) A- 20028, that could be installed in the affected governors. This proposed AD would require replacing the governor with a governor that is eligible for installation. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Apr 7, 2020: Notice of proposed rulemaking (NPRM). (first notice), FR document 2020-07168, comments due May 22, 2020 (https://www.federalregister.gov/documents/2020/04/07/2020-07168/airworthiness-directives-mccauley-propeller-systems-governors)

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