# Proposed AD FAA-2020-0554: Leonardo S.p.a. Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2020-19-04
- Products: Leonardo
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 8, 2020, 85 FR 35018
- Comments due: July 23, 2020
- Became: [AD 2020-19-04](https://openairdocs.org/ad/2020-19-04)
- Docket: FAA-2020-0554 (https://www.regulations.gov/docket/FAA-2020-0554, where comments are filed)
- FR document: 2020-12155
- Official PDF: https://openairdocs.org/files/sha256/72/a9/72a9347388988bd412cc67452799497c68475af2c077ea408716216d19cbe87f (from https://www.govinfo.gov/content/pkg/FR-2020-06-08/pdf/2020-12155.pdf)
- Federal Register: https://www.federalregister.gov/documents/2020/06/08/2020-12155/airworthiness-directives-leonardo-spa-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/B6E5DD9ECADF7A5786258581004B1E05.0001
- Page: https://openairdocs.org/proposed/FAA-2020-0554

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for Leonardo S.p.a. (Leonardo) Model AB139 and AW139 helicopters. This proposed AD would require removing certain main gearbox (MGB) input modules from service. This proposed AD was prompted by the discovery that a batch of duplex bearings, which are installed on the MGB input modules, are defective. The actions of this proposed AD are intended to address an unsafe condition on these products.

## Notices in this docket

- Jun 8, 2020: Notice of proposed rulemaking (NPRM). (first notice), FR document 2020-12155, comments due Jul 23, 2020 (https://www.federalregister.gov/documents/2020/06/08/2020-12155/airworthiness-directives-leonardo-spa-helicopters)

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