# Proposed AD FAA-2020-0410: Airbus Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2020-21-01
- Products: Airbus Helicopters
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 23, 2020, 85 FR 22688
- Comments due: June 22, 2020
- Became: [AD 2020-21-01](https://openairdocs.org/ad/2020-21-01)
- Docket: FAA-2020-0410 (https://www.regulations.gov/docket/FAA-2020-0410, where comments are filed)
- FR document: 2020-08583
- Official PDF: https://openairdocs.org/files/sha256/a7/eb/a7eb90ab4a8687fd3fe1378ec8943a767f90e5545dbfa489927d53376dc5c178 (from https://www.govinfo.gov/content/pkg/FR-2020-04-23/pdf/2020-08583.pdf)
- Federal Register: https://www.federalregister.gov/documents/2020/04/23/2020-08583/airworthiness-directives-airbus-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C2824F05856AF22486258553003F9BA7.0001
- Page: https://openairdocs.org/proposed/FAA-2020-0410

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain Airbus Helicopters Model AS-365N2, AS 365N3, EC 155B, EC155B1, and SA-365N1 helicopters. This proposed AD would require modifying the main gearbox (MGB) tail rotor (T/R) drive flange installation. This proposed AD was prompted by several reported occurrences of loss of tightening torque of the Shur-Lok nut, which serves as a retainer of the T/R drive flange. The actions of this proposed AD are intended to address an unsafe condition on these products.

## Notices in this docket

- Apr 23, 2020: Notice of proposed rulemaking (NPRM). (first notice), FR document 2020-08583, comments due Jun 22, 2020 (https://www.federalregister.gov/documents/2020/04/23/2020-08583/airworthiness-directives-airbus-helicopters)

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