Hydraulic Power — Engine Driven Pump — Software Update / Modification; Aircraft Flight Manual — Abnormal and Emergency Procedures — Amendment
- Published
- Effective
- Replaces
- 2025-0035
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must modify the hydraulic monitoring and control application software within 6 months for Group 1 aircraft and within 12 months for Group 2 aircraft, following the applicable Airbus service bulletins. Additionally, Group 1 aircraft must implement the Aircraft Flight Manual revision within 3 months of the directive's effective date. Concurrent modifications per Airbus SB A350-42-P020 must be completed prior to or alongside the software update as applicable.
Summary
EASA Airworthiness Directive 2025-0139 is an update applicable to Airbus A350-941 and A350-1041 aeroplanes, excluding those with Airbus modification 116830 embodied in production. It addresses hydraulic engine driven pump failures by requiring software updates to the hydraulic monitoring and control application and amendments to the Aircraft Flight Manual's abnormal and emergency procedures. This directive ensures continued airworthiness and safety compliance for affected Airbus A350 models.
What changed
EASA Airworthiness Directive 2025-0139 supersedes AD 2025-0035 and retains its modification requirements while adding a mandatory amendment to the Aircraft Flight Manual Documentary Unit. It clarifies applicability for concurrent modifications and introduces updated service bulletin revisions to enhance hydraulic pump overheat protection through software updates.
Why it matters
This directive is critical for operators and maintenance organizations to prevent hydraulic engine driven pump failures that could lead to overheating and potential safety risks. Compliance ensures that affected Airbus A350 aircraft meet quantitative safety requirements and maintain operational safety standards. It also impacts flight crews by requiring updated flight manual procedures for abnormal and emergency situations.
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