EASA AD 2018-0002
Information Systems — —Primus Epic— System Software — Software Update
Summary
EASA Airworthiness Directive 2018-0002 is an official regulatory document addressing software updates for the "Primus Epic" system installed on Leonardo S.p.A. AB139 and AW139 helicopters. This directive applies to specific serial numbers equipped with software releases 7.4, 7.7, or 7.10. It mandates an upgrade to improved software versions to ensure continued airworthiness and system reliability.
What Changed
This new Airworthiness Directive requires the installation of updated "Primus Epic" system software release 7.12 or 7.14, depending on helicopter configuration, to address spurious in-flight disconnections of the Automatic Flight Control System (AFCS). The directive introduces mandatory compliance with Leonardo Service Bulletin 139-500 for the software upgrade within a specified timeframe.
Why It Matters
This directive is critical for aviation professionals because the identified software issue can cause unexpected autopilot disengagements, potentially increasing pilot workload and reducing flight safety. Operators and maintenance organizations must ensure compliance to maintain the reliability of the AFCS and avoid operational disruptions or safety risks associated with software malfunctions.
What To Do
Operators of affected AB139 and AW139 helicopters must install the applicable "Primus Epic" system software upgrade (release 7.12 or 7.14) within 600 flight hours or 12 months from the effective date of 18 January 2018. After compliance, only the approved or later software versions may be installed. Maintenance teams should follow Leonardo Service Bulletin 139-500 for the upgrade procedures.
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