# Proposed AD FAA-2021-0839: Airbus Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2021-26-18
- Products: Airbus Helicopters
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: September 30, 2021, 86 FR 54139
- Comments due: November 15, 2021
- Became: [AD 2021-26-18](https://openairdocs.org/ad/2021-26-18)
- Docket: FAA-2021-0839 (https://www.regulations.gov/docket/FAA-2021-0839, where comments are filed)
- Project: MCAI-2020-01697-R
- FR document: 2021-21199
- Official PDF: https://openairdocs.org/files/sha256/f0/ba/f0ba8cf40c40757d32967590cb9ebde5742ce0ef0cf544f3781a4c539cb5c1f3 (from https://www.govinfo.gov/content/pkg/FR-2021-09-30/pdf/2021-21199.pdf)
- Federal Register: https://www.federalregister.gov/documents/2021/09/30/2021-21199/airworthiness-directives-airbus-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/532861AD46AA3022862587610073D943.0001
- Page: https://openairdocs.org/proposed/FAA-2021-0839

## Summary

The FAA proposes to supersede Airworthiness Directive (AD) 2020-21-01, which applies to certain Airbus Helicopters Model AS-365N2, AS 365N3, EC 155B, EC155B1, and SA-365N1 helicopters. AD 2020-21-01 requires modifying the main gearbox (MGB) tail rotor (T/R) drive flange installation. Since the FAA issued AD 2020-21-01, the FAA has determined that additional helicopters are affected by the unsafe condition. This proposed AD would continue to require modifying the MGB T/R drive flange installation, and would also include new helicopters in the applicability for the required actions. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Sep 30, 2021: Notice of proposed rulemaking (NPRM). (first notice), FR document 2021-21199, comments due Nov 15, 2021 (https://www.federalregister.gov/documents/2021/09/30/2021-21199/airworthiness-directives-airbus-helicopters)

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