Integrated Modular Avionics — Aircraft Management Computer Software — Update
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What to do
Operators of MBB-BK117 D-2 helicopters with affected Aircraft Management Computers must update the software to the specified upgraded versions within two months of the directive's effective date, 29 August 2019. They must also amend the Rotorcraft Flight Manual emergency procedures as specified and avoid installing any pre-modification software versions on any helicopter. Flight crews should be informed of these changes and operate accordingly.
Summary
EASA Airworthiness Directive 2019-0208 is an update concerning the Aircraft Management Computer software for Airbus Helicopters Deutschland GmbH MBB-BK117 D-2 helicopters. It addresses a software issue in the Integrated Modular Avionics system that caused erroneous low rotor RPM indications during One Engine Inoperative conditions. This directive applies to all serial numbers of the MBB-BK117 D-2 helicopter model.
What changed
This directive supersedes previous ADs 2017-0238 and 2018-0230 by requiring an upgraded Aircraft Management Computer software update to version V5.0.4 or later, which prevents erroneous RPM indications. It retains earlier requirements for amending the Rotorcraft Flight Manual emergency procedures and prohibits installation of older software versions on affected parts. The directive also clarifies compliance methods and acceptable alternative actions.
Why it matters
The update is critical to prevent incorrect rotor RPM readings that could lead to inappropriate pilot responses during engine failure scenarios, potentially causing helicopter damage or occupant injury. Operators and maintenance teams must ensure compliance to maintain airworthiness and flight safety. The directive also streamlines compliance by consolidating previous AD requirements and software updates.
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