Pneumatic — Trent XWB Engine Bleed Air Supply System T-Duct — Replacement
- Published
- Effective
- Replaces
- 2023-0189R1
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 aeroplanes must replace affected EBAS T-Duct parts within specified flight cycle limits or within 30 days for Group 3 aeroplanes, following Airbus Service Bulletin A350-36-P033 instructions. Installation of affected parts on Group 3 aeroplanes is prohibited from the effective date of 8 December 2025. Compliance with these requirements is mandatory to continue operation of affected aircraft.
Summary
EASA Airworthiness Directive 2025-0259 is issued for Airbus A350-941 and A350-1041 aeroplanes equipped with any Trent XWB engines, focusing on the replacement of the Trent XWB Engine Bleed Air Supply System T-Duct with part number RR03-11011-001. This directive addresses a potential unsafe condition caused by manufacturing non-conformance that may lead to cracking and air leakage in the T-Duct, risking uncontained engine failure or uncontrolled engine fire. The AD mandates replacement of affected parts and restricts installation of certain parts on specific engine models.
What changed
EASA AD 2025-0259 supersedes AD 2023-0189R1 and introduces reduced compliance times for replacement of affected T-Duct parts on Group 3 aeroplanes (those with engines other than Trent XWB-75, -84, or -97). It also prohibits installation of affected parts on Group 3 aeroplanes and updates installation criteria based on the latest Rolls-Royce service bulletin revisions. The AD retains some previous requirements but tightens compliance and installation restrictions.
Why it matters
This AD is critical for aviation professionals to prevent potential engine failures caused by defective bleed air system components, which could lead to serious safety risks including engine fires and loss of aircraft control. Operators and maintenance organizations must ensure timely replacement of affected parts to maintain airworthiness and regulatory compliance. The directive also impacts parts logistics and installation practices, requiring careful tracking of part serviceability and flight cycles.
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