Airworthiness DirectiveEASA AD 2013-0223R1

Engine — Low Pressure Turbine Bearing Support and Exhaust Case Assembly — Inspection / Replacement

Published: Sep 30, 2020
Effective: Oct 7, 2020
Deadline: Dec 31, 2024
Replaces: 2013-0223

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What to do

Operators must replace affected tail bearing housings on Group 1 engines by the next qualified shop visit or no later than June 30, 2017. For Group 2 engines, inspections must be performed within specified compliance times, including before release to service during shop visits or by December 31, 2024. If inspections reveal defects, immediate replacement with serviceable parts is required before engine release to service. Compliance with the latest Rolls-Royce service bulletins is mandatory.

Summary

EASA Airworthiness Directive 2013-0223R1 is an updated regulatory requirement addressing the inspection and replacement of the low pressure turbine bearing support and exhaust case assembly on Rolls-Royce RB211 Trent 800 series engines, commonly installed on Boeing 777 aircraft. The directive mandates inspection and replacement or rework of certain tail bearing housings to ensure structural integrity. It applies to specific engine models including RB211 Trent 875-17, 877-17, 884-17, 884B-17, 892-17, 892B-17, and 895-17.

What changed

This revision extends the compliance time for inspections and replacements as specified in the latest Rolls-Royce Non-Modification Service Bulletin (Revision 3). It also updates the directive to align with current AD writing standards and includes editorial changes without altering the core requirements. The revised compliance deadlines provide additional flexibility for operators while maintaining safety standards.

Why it matters

This directive is critical for aviation professionals to prevent potential engine failure due to thin-walled tail bearing housings that may not withstand fan blade failure events. Compliance ensures continued airworthiness and reduces the risk of engine rear mount loss, which could compromise aircraft control. Operators, maintenance organizations, and compliance teams must prioritize these inspections and replacements to avoid unsafe conditions and regulatory non-compliance.

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