Airworthiness DirectiveEASA AD 2024-0070

Oil — Front Bearing Housing Oil Feed Tube Assembly — Replacement

Published: Mar 14, 2024
Effective: Mar 28, 2024
Deadline: Mar 28, 2024

AI-generated summary of the official EASA document. Verify against the PDF before acting.

What to do

Operators must modify Group 1 engines by replacing the affected oil feed tube assemblies during the next qualified engine shop visit or within 75 months after 28 March 2024, whichever occurs first. Installation of affected parts is prohibited on all engines from the effective date. Maintenance teams should follow Rolls-Royce Service Bulletin TRENT XWB 79-AK684 instructions for the modification and ensure affected parts are removed from service.

Summary

EASA Airworthiness Directive 2024-0070 is an airworthiness directive addressing Rolls-Royce Trent XWB-75, Trent XWB-79, Trent XWB-79B, and Trent XWB-84 engines installed on Airbus A350 aircraft. The directive mandates the replacement of front bearing housing oil feed tube assemblies with a specific serviceable part to ensure safe engine operation. It applies to all serial numbers of these engine models.

What changed

This new airworthiness directive introduces a mandatory modification requiring the replacement of affected front bearing housing oil feed tube assemblies (P/N KH47678) with serviceable parts (P/N LV19901). It prohibits the installation of the affected parts on any engine and requires compliance during the next qualified engine shop visit or within 75 months from the effective date. The directive incorporates Rolls-Royce Service Bulletin TRENT XWB 79-AK684 as the method for modification.

Why it matters

This directive addresses a safety concern where differential oil pressures in affected engines were found to be lower than expected, potentially leading to front bearing housing bearing chamber fires and engine in-flight shutdowns. Compliance is critical for operators and maintenance organizations to prevent engine failures that could compromise aircraft control and safety. It ensures continued airworthiness and regulatory compliance for affected Airbus A350 operators using Trent XWB engines.

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