# Proposed AD FAA-2022-0294: Airbus Helicopters Deutschland GmbH (AHD) Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2022-11-07
- Products: Airbus Helicopters Deutschland
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 28, 2022, 87 FR 17201
- Comments due: May 12, 2022
- Became: [AD 2022-11-07](https://openairdocs.org/ad/2022-11-07)
- Docket: FAA-2022-0294 (https://www.regulations.gov/docket/FAA-2022-0294, where comments are filed)
- Project: MCAI-2021-00550-R
- FR document: 2022-06358
- Official PDF: https://openairdocs.org/files/sha256/9c/e9/9ce928e688722f0f01739ef295fad06be2ad68d733e0a97103ffd238c4127260 (from https://www.govinfo.gov/content/pkg/FR-2022-03-28/pdf/2022-06358.pdf)
- Federal Register: https://www.federalregister.gov/documents/2022/03/28/2022-06358/airworthiness-directives-airbus-helicopters-deutschland-gmbh-ahd-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2022-06358-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2022-0294

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for all Airbus Helicopters Deutschland GmbH (AHD) Model MBB-BK117 A-1, MBB-BK117 A-3, MBB-BK117 A-4, MBB-BK117 B-1, MBB-BK117 B-2, MBB-BK117 C-1, MBB-BK117 C-2, and MBB-BK117 D-2 helicopters. This proposed AD was prompted by the FAA's determination that aging of the elastomeric material of certain tension torsion straps (TT-Straps), during the period since manufacturing date up to first flight on a helicopter, may affect its structural characteristics. This proposed AD would require the replacement of certain TT-Straps, implementation of storage life limits for TT-Straps, a prohibition on installing certain TT-Straps and conditions for installation of certain other TT-Straps, as specified in a European Union Aviation Safety Agency (EASA) AD, which is proposed for incorporation by reference (IBR). The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Mar 28, 2022: Notice of proposed rulemaking (NPRM). (first notice), FR document 2022-06358, comments due May 12, 2022 (https://www.federalregister.gov/documents/2022/03/28/2022-06358/airworthiness-directives-airbus-helicopters-deutschland-gmbh-ahd-helicopters)

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