# Proposed AD FAA-2021-0143: Airbus Helicopters Deutschland GmbH Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2021-10-14
- Products: Airbus Helicopters Deutschland
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 12, 2021, 86 FR 14023
- Comments due: April 26, 2021
- Became: [AD 2021-10-14](https://openairdocs.org/ad/2021-10-14)
- Docket: FAA-2021-0143 (https://www.regulations.gov/docket/FAA-2021-0143, where comments are filed)
- FR document: 2021-05148
- Official PDF: https://openairdocs.org/files/sha256/e9/08/e9081e41f1a45d8d5ec91f8a7e67972f6095ba408ed44829a8bc51d8ef5ee0ae (from https://www.govinfo.gov/content/pkg/FR-2021-03-12/pdf/2021-05148.pdf)
- Federal Register: https://www.federalregister.gov/documents/2021/03/12/2021-05148/airworthiness-directives-airbus-helicopters-deutschland-gmbh-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/76ACAA0BB6DD1D2086258696004C1879.0001
- Page: https://openairdocs.org/proposed/FAA-2021-0143

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain Airbus Helicopters Deutschland GmbH Model BO-105A, BO-105C, BO-105S, and BO-105LS A-3 helicopters. This proposed AD was prompted by the FAA's determination that aging of the elastomeric material in a tension torsion strap (TT-strap) could affect the structural characteristics of the TT-strap. This proposed AD would require replacement of certain TT-straps with serviceable parts and implementation of a new storage life limit for TT-straps, as specified in a European Aviation Safety Agency (now 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 12, 2021: Notice of proposed rulemaking (NPRM). (first notice), FR document 2021-05148, comments due Apr 26, 2021 (https://www.federalregister.gov/documents/2021/03/12/2021-05148/airworthiness-directives-airbus-helicopters-deutschland-gmbh-helicopters)

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