# Proposed AD FAA-2021-0507: Leonardo S.p.a. Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2021-18-11
- Products: Leonardo
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 24, 2021, 86 FR 33149
- Comments due: August 9, 2021
- Became: [AD 2021-18-11](https://openairdocs.org/ad/2021-18-11)
- Docket: FAA-2021-0507 (https://www.regulations.gov/docket/FAA-2021-0507, where comments are filed)
- Project: 2018-SW-117-AD
- FR document: 2021-13130
- Official PDF: https://openairdocs.org/files/sha256/5a/3b/5a3b77d1a8db778a842f08db48b988081d010d10af263e0f949bd9eb35e32a85 (from https://www.govinfo.gov/content/pkg/FR-2021-06-24/pdf/2021-13130.pdf)
- Federal Register: https://www.federalregister.gov/documents/2021/06/24/2021-13130/airworthiness-directives-leonardo-spa-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/B25A32BDD1C24C3C862586FF004D8C1D.0001
- Page: https://openairdocs.org/proposed/FAA-2021-0507

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain Leonardo S.p.a. Model AB139 and Model AW139 helicopters. This proposed AD was prompted by a report that, during a post-flight inspection of an in-service helicopter, a tail rotor slider assembly was found fractured, and the bushing and the actuator rod in the tail rotor servo were partially damaged. This proposed AD would require an inspection of the tail rotor slider assembly for corrosion and signs of circumferential refinishing and, depending on the findings, replacement of the tail rotor slider assembly with a serviceable part or repetitive inspections of the of the tail rotor slider assembly for corrosion and signs of circumferential refinishing, as specified in a European Aviation Safety Agency (now European Union Aviation Safety Agency) (EASA) AD, which is proposed for incorporation by reference (IBR). The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Jun 24, 2021: Notice of proposed rulemaking (NPRM). (first notice), FR document 2021-13130, comments due Aug 9, 2021 (https://www.federalregister.gov/documents/2021/06/24/2021-13130/airworthiness-directives-leonardo-spa-helicopters)

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