# Proposed AD FAA-2020-0974: Airbus Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2021-02-09
- Products: Airbus Helicopters
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 2, 2020, 85 FR 69267
- Comments due: December 17, 2020
- Became: [AD 2021-02-09](https://openairdocs.org/ad/2021-02-09)
- Docket: FAA-2020-0974 (https://www.regulations.gov/docket/FAA-2020-0974, where comments are filed)
- Project: MCAI-2020-00273-R
- FR document: 2020-24103
- Official PDF: https://openairdocs.org/files/sha256/fb/d6/fbd694921edea5ba42ce59794684b6cf227d8e6ba9c572fcbe53ee53bde0150b (from https://www.govinfo.gov/content/pkg/FR-2020-11-02/pdf/2020-24103.pdf)
- Federal Register: https://www.federalregister.gov/documents/2020/11/02/2020-24103/airworthiness-directives-airbus-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/E35AD148A03FBD3586258614005363A2.0001
- Page: https://openairdocs.org/proposed/FAA-2020-0974

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for all Airbus Helicopters Model EC 155B and EC155B1 helicopters. This proposed AD was prompted by a report that non-destructive tests of the main gearbox (MGB) housing may have been evaluated incorrectly during production. This proposed AD would require replacing affected MGBs with serviceable MGBs, 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

- Nov 2, 2020: Notice of proposed rulemaking (NPRM). (first notice), FR document 2020-24103, comments due Dec 17, 2020 (https://www.federalregister.gov/documents/2020/11/02/2020-24103/airworthiness-directives-airbus-helicopters)

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