# Proposed AD FAA-2016-3257: Airbus Helicopters Deutschland GmbH

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2017-07-08
- Products: Airbus Helicopters Deutschland
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 21, 2016, 81 FR 83182
- Comments due: January 20, 2017
- Became: [AD 2017-07-08](https://openairdocs.org/ad/2017-07-08)
- Docket: FAA-2016-3257 (https://www.regulations.gov/docket/FAA-2016-3257, where comments are filed)
- Project: 2015-SW-072-AD
- FR document: 2016-27765
- Official PDF: https://openairdocs.org/files/sha256/43/50/4350859c7293ed8c7525ad119971b325dbebb478c22f0b7b4fd60629e138fab6 (from https://www.govinfo.gov/content/pkg/FR-2016-11-21/pdf/2016-27765.pdf)
- Federal Register: https://www.federalregister.gov/documents/2016/11/21/2016-27765/airworthiness-directives-airbus-helicopters-deutschland-gmbh
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/324695C80203CD33862580720052DCC9.0001
- Page: https://openairdocs.org/proposed/FAA-2016-3257

## Summary

We propose to adopt a new airworthiness directive (AD) for Airbus Helicopters Deutschland GmbH (Airbus Helicopters) MBB-BK 117 D-2 helicopters. This proposed AD would require repetitively inspecting the bushings of the inner and outer forward trusses of both engines. This proposed AD is prompted by reports of delaminated and worn engine mount bushings. The proposed actions are intended to detect delaminated engine mount bushings, which can lead to excessive vibration, cracking, failure of the engine mount front support pins, and loss of helicopter control.

## Notices in this docket

- Nov 21, 2016: Notice of proposed rulemaking (NPRM). (first notice), FR document 2016-27765, comments due Jan 20, 2017 (https://www.federalregister.gov/documents/2016/11/21/2016-27765/airworthiness-directives-airbus-helicopters-deutschland-gmbh)

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