# Proposed AD FAA-2017-1085: Airbus Helicopters Deutschland GmbH Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2019-06-05
- Products: Airbus Helicopters Deutschland
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: September 10, 2018, 83 FR 45578
- Comments due: November 9, 2018
- Became: [AD 2019-06-05](https://openairdocs.org/ad/2019-06-05)
- Docket: FAA-2017-1085 (https://www.regulations.gov/docket/FAA-2017-1085, where comments are filed)
- FR document: 2018-19436
- Official PDF: https://openairdocs.org/files/sha256/58/76/587697c2b4bde07850e4c0815a6503d8db8f03fa18912553b1a98b4d52610c7a (from https://www.govinfo.gov/content/pkg/FR-2018-09-10/pdf/2018-19436.pdf)
- Federal Register: https://www.federalregister.gov/documents/2018/09/10/2018-19436/airworthiness-directives-airbus-helicopters-deutschland-gmbh-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/312ABD1C33335E8486258304006196D0.0001
- Page: https://openairdocs.org/proposed/FAA-2017-1085

## Summary

We propose to adopt a new airworthiness directive (AD) for Airbus Helicopters Deutschland GmbH (Airbus Helicopters) Model MBB-BK 117 A-1, MBB-BK 117A-3, MBB-BK 117 A-4, MBB-BK 117 B-1, MBB-BK 117 B-2, MBB-BK 117 C-1, and MBB-BK 117 C-2 helicopters. This proposed AD would require repetitive inspections of the tail rotor (T/R) gearbox housing. This proposed AD is prompted by a report that a crack was found in a T/ R gearbox housing. The actions of this proposed AD are intended to address an unsafe condition on these products.

## Notices in this docket

- Sep 10, 2018: Notice of proposed rulemaking (NPRM). (first notice), FR document 2018-19436, comments due Nov 9, 2018 (https://www.federalregister.gov/documents/2018/09/10/2018-19436/airworthiness-directives-airbus-helicopters-deutschland-gmbh-helicopters)

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