# Airworthiness Directives; Airbus Helicopters Deutschland GmbH Helicopters
> **Rule** · Final rule. · Published 2020-09-22 · Effective 2020-10-27 · 85 FR 59413
## Document
- **Document number:** 2020-20763
- **Category:** airworthiness
- **Manufacturer:** Airbus
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 85 FR 59413
- **Publication date:** 2020-09-22
- **Effective date:** 2020-10-27
- **FAA docket:** Docket No. FAA-2020-0342
## Abstract

The FAA is adopting a new airworthiness directive (AD) for all Airbus Helicopters Deutschland GmbH Model MBB-BK 117 D-2 helicopters. This AD was prompted by a report of an erroneous low rotor revolutions per minute (RPM) indication after establishing a one engine inoperative (OEI) condition. This AD requires a software (SW) modification for the aircraft management computer (AMC). The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2020/09/22/2020-20763/airworthiness-directives-airbus-helicopters-deutschland-gmbh-helicopters)
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