Hydraulic Power – Engine Driven Pump – Software Update / Modification
Superseded. Comply with 2025-0139, which replaces this document.
- Published
- Effective
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of Airbus A350-941 and A350-1041 aircraft not already modified with Airbus mod 116830 must update the HMCA software within specified deadlines: Group 1 aircraft within 6 months and Group 2 aircraft within 12 months from the effective date of 26 February 2025. Additionally, the modification per Airbus SB A350-42-P020 must be completed prior to or concurrently with the HMCA update. Maintenance teams should follow the instructions in the applicable Airbus Service Bulletins for compliance.
Summary
EASA Airworthiness Directive 2025-0035 is an airworthiness directive issued by the European Union Aviation Safety Agency affecting Airbus A350-941 and A350-1041 aeroplanes, excluding those with Airbus modification 116830 incorporated in production. The directive addresses issues related to hydraulic engine driven pumps and requires a software update to the Hydraulic Monitoring and Control Application (HMCA) to enhance protection against overheating. This directive is effective from 26 February 2025.
What changed
This directive introduces a mandatory modification of the HMCA software to version S6.0, improving the robustness of the engine driven pump case drain overheat protection. It requires operators to retrofit affected aircraft using Airbus Service Bulletins A350-29-P051 revision 01 or A350-29-P052 depending on the installed software group. The directive also mandates concurrent modification per Airbus SB A350-42-P020 before or during the HMCA update.
Why it matters
This directive is critical for aviation professionals as it addresses a safety risk involving repetitive overheating of hydraulic engine driven pumps, which could lead to pump damage and non-compliance with safety requirements. Operators and maintenance organizations must ensure compliance to maintain aircraft airworthiness and avoid operational restrictions. Compliance ensures continued safe operation and adherence to European Union aviation safety regulations.
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