# Proposed AD FAA-2021-0829: Airbus Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2021-24-08
- Products: Airbus Helicopters
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: September 23, 2021, 86 FR 52859
- Comments due: November 8, 2021
- Became: [AD 2021-24-08](https://openairdocs.org/ad/2021-24-08)
- Docket: FAA-2021-0829 (https://www.regulations.gov/docket/FAA-2021-0829, where comments are filed)
- Project: MCAI-2021-00189-R
- FR document: 2021-20414
- Official PDF: https://openairdocs.org/files/sha256/8f/ee/8fee4f727ed35d8260de75800ba37ee70278268b285d8564915c70f20db971c2 (from https://www.govinfo.gov/content/pkg/FR-2021-09-23/pdf/2021-20414.pdf)
- Federal Register: https://www.federalregister.gov/documents/2021/09/23/2021-20414/airworthiness-directives-airbus-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4DF86A63846B206C86258759004E64E1.0001
- Page: https://openairdocs.org/proposed/FAA-2021-0829

## Summary

The FAA proposes to supersede Airworthiness Directive (AD) 2021-04-21, which applies to certain Airbus Helicopters Model EC120B helicopters. AD 2021-04-21 requires an inspection of the attachment bolts of the main rotor (MR) hub scissors assembly for discrepancies and repair if necessary; part marking of the attachment bolts of the MR hub scissors assembly; and repetitive inspections of the part marking of the attachment bolts, and repair if necessary. Since the FAA issued AD 2021-04-21, the FAA has determined that additional part marking of the washer, scissor branch, and mast ring of the corresponding nut side, and repetitive inspections of the additional part markings are necessary. This proposed AD would continue to require the actions in AD 2021-04-21; and also would require part marking of the washer, scissor branch, and mast ring of the corresponding nut side, and repetitive inspections of the additional part markings and repair if necessary; as specified in a EuropeanUnion 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

- Sep 23, 2021: Notice of proposed rulemaking (NPRM). (first notice), FR document 2021-20414, comments due Nov 8, 2021 (https://www.federalregister.gov/documents/2021/09/23/2021-20414/airworthiness-directives-airbus-helicopters)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.