# Proposed AD FAA-2020-1123: Airbus Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2021-05-05
- Products: Airbus Helicopters
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 14, 2020, 85 FR 80689
- Comments due: January 28, 2021
- Became: [AD 2021-05-05](https://openairdocs.org/ad/2021-05-05)
- Docket: FAA-2020-1123 (https://www.regulations.gov/docket/FAA-2020-1123, where comments are filed)
- Project: MCAI-2020-01294-R
- FR document: 2020-27416
- Official PDF: https://openairdocs.org/files/sha256/de/00/de002c46869083089d136ac1774a3b1e9e794fb2e4c87a7ac78639b705e94bc8 (from https://www.govinfo.gov/content/pkg/FR-2020-12-14/pdf/2020-27416.pdf)
- Federal Register: https://www.federalregister.gov/documents/2020/12/14/2020-27416/airworthiness-directives-airbus-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/83ACDB25086A525D8625863E006007FF.0001
- Page: https://openairdocs.org/proposed/FAA-2020-1123

## Summary

The FAA proposes to supersede Airworthiness Directive (AD) 2016-23-05, which applies to certain Airbus Helicopters Model SA-365N1, AS-365N2, AS 365 N3, SA-366G1, EC 155B, and EC155B1 helicopters. AD 2016-23-05 requires repetitive checks of the oil level of the tail rotor gearbox and, if necessary, filling the oil to the

((Page 80690))

maximum level; and replacement of a certain control rod double bearing (bearing) with a new bearing. Since issuing AD 2016-23-05, the FAA has determined additional inspections, replacements, and modifications are necessary to address the unsafe condition. This proposed AD would retain the requirements of AD 2016-23-05 and would add helicopters to the applicability. This proposed AD would also require modifying the helicopter by replacing the tail gearbox (TGB) control shaft guide bushes; repetitive inspections of the TGB magnetic plug and corrective actions if necessary; repetitive replacements of the bearing; and modifying the helicopterby replacing the TGB; as specified in a European Union Aviation Safety Agency (EASA) AD, which will be incorporated by reference. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Dec 14, 2020: Notice of proposed rulemaking (NPRM). (first notice), FR document 2020-27416, comments due Jan 28, 2021 (https://www.federalregister.gov/documents/2020/12/14/2020-27416/airworthiness-directives-airbus-helicopters)

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