# Proposed AD FAA-2021-0620: Helicopteres Guimbal Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2021-21-06
- Products: Helicopteres Guimbal
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 9, 2021, 86 FR 43449
- Comments due: September 23, 2021
- Became: [AD 2021-21-06](https://openairdocs.org/ad/2021-21-06)
- Docket: FAA-2021-0620 (https://www.regulations.gov/docket/FAA-2021-0620, where comments are filed)
- Project: 2019-SW-074-AD
- FR document: 2021-16684
- Official PDF: https://openairdocs.org/files/sha256/4c/a8/4ca8b882d43c69194fb612347334b257abd5485a7bcacca287691bc8fb9bf22d (from https://www.govinfo.gov/content/pkg/FR-2021-08-09/pdf/2021-16684.pdf)
- Federal Register: https://www.federalregister.gov/documents/2021/08/09/2021-16684/airworthiness-directives-hlicoptres-guimbal-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/93C21DC616EB472F8625872D00797477.0001
- Page: https://openairdocs.org/proposed/FAA-2021-0620

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for Helicopteres Guimbal (HG) Model Cabri G2 helicopters with certain part-numbered aluminum cooling fans (cooling fan) installed. This proposed AD was prompted by reports of two occurrences of in-flight shutdowns due to a crack and subsequent failure of the cooling fan. This proposed AD would require removing certain part- numbered cooling fans from service, or modifying certain part-numbered cooling fans before exceeding a certain total hours time-in-service (TIS), and installing newly designed cooling fans. This proposed AD would also prohibit installing any affected cooling fan on any helicopter. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Aug 9, 2021: Notice of proposed rulemaking (NPRM). (first notice), FR document 2021-16684, comments due Sep 23, 2021 (https://www.federalregister.gov/documents/2021/08/09/2021-16684/airworthiness-directives-hlicoptres-guimbal-helicopters)

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