# Proposed AD FAA-2021-0335: Airbus Helicopters Deutschland GmbH Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2021-14-05
- Products: Airbus Helicopters Deutschland
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 26, 2021, 86 FR 21965
- Comments due: June 10, 2021
- Became: [AD 2021-14-05](https://openairdocs.org/ad/2021-14-05)
- Docket: FAA-2021-0335 (https://www.regulations.gov/docket/FAA-2021-0335, where comments are filed)
- Project: MCAI-2020-01665-R
- FR document: 2021-08569
- Official PDF: https://openairdocs.org/files/sha256/c5/74/c5741362c0f29d412874b4cdc266a7dfc8487a6405a0f62f31dc7685b97d4c04 (from https://www.govinfo.gov/content/pkg/FR-2021-04-26/pdf/2021-08569.pdf)
- Federal Register: https://www.federalregister.gov/documents/2021/04/26/2021-08569/airworthiness-directives-airbus-helicopters-deutschland-gmbh-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/CE59AD0DE7D075C9862586C3006E2FF5.0001
- Page: https://openairdocs.org/proposed/FAA-2021-0335

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for all Airbus Helicopters Deutschland GmbH MBB-BK 117 A-1, MBB-BK 117 A-3, MBB-BK 117 A-4, MBB-BK 117 B-1, MBB-BK 117 B-2, and MBB-BK 117 C-1 helicopters. This proposed AD was prompted by a report of sudden severe vibrations and a cracked open blade trailing edge caused by a loosened lead inner weight. This proposed AD would require inspections to determine if any bolted main rotor blades are installed, and replacement of the affected main rotor blades. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Apr 26, 2021: Notice of proposed rulemaking (NPRM). (first notice), FR document 2021-08569, comments due Jun 10, 2021 (https://www.federalregister.gov/documents/2021/04/26/2021-08569/airworthiness-directives-airbus-helicopters-deutschland-gmbh-helicopters)

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