EASA AD 2025-0196
Rotorcraft Flight Manual — Emergency Procedures Section — Amendment; Integrated Modular Avionics — Ethernet Network — Inspection / Modification
Summary
EASA Airworthiness Directive 2025-0196 is an amendment addressing safety concerns for Airbus Helicopters EC 175 B models. It mandates inspections, modifications, and updates related to the integrated modular avionics Ethernet network and rotorcraft flight manual emergency procedures. The directive targets all EC 175 B helicopters except those with specific Airbus Helicopters modifications already embodied.
What Changed
This directive supersedes EASA AD 2022-0121 and revises requirements by introducing mandatory software modifications to the Helionix avionics suite, including aircraft management computers and multi-function displays. It also restates previous harness and connector modifications and updates the Rotorcraft Flight Manual with new emergency procedures. Additionally, it removes EC 175 B helicopters from the applicability of EASA AD 2022-0168.
Why It Matters
The directive addresses critical design deficiencies in the Helionix Ethernet network that could cause multiple multi-function display failures, potentially reducing pilot situational awareness and helicopter control. Compliance ensures continued airworthiness and operational safety, preventing in-flight avionics failures. Operators and maintenance teams must adhere to inspection intervals and corrective actions to mitigate risks associated with avionics network faults.
What To Do
Operators must perform repetitive functional checks of the Helionix Ethernet network within 55 flight hours after 15 July 2022 and every 110 flight hours thereafter. Corrective actions must be taken immediately if discrepancies are found. Within 25 months of 26 September 2025, all affected helicopters must undergo software modifications of the Helionix avionics and related rewiring. The Rotorcraft Flight Manual must be amended within 7 days after 26 August 2022 to include the new emergency procedures.