Rolls-Royce RB211-535 and -524 Engines - Faulty Inspection of High Pressure Turbine Discs
- Published
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Affected stakeholders should review Rolls-Royce NMSB RB211-72-AF996 and verify that HP Turbine Discs identified by part and serial numbers have been correctly inspected, especially focusing on cooling air holes. Operators and maintenance organizations should ensure compliance with EASA AD 2006-0182, 2006-0180, UK-CAA AD G-2004-0027, G-2006-0002, and FAA AD 2006-17-12. No specific compliance deadline is stated, but prompt action is recommended to maintain airworthiness.
Summary
EASA Safety Information Bulletin SIB No. 2008-46 addresses the faulty inspection of High Pressure (HP) Turbine Discs on Rolls-Royce RB211-535 and RB211-524 series engines. These engines are commonly installed on Boeing 747 and 757 aircraft. The bulletin highlights concerns about improper inspection of cooling air holes on HP Turbine Discs, which are subject to existing Airworthiness Directives.
What changed
This bulletin introduces awareness of an investigation revealing that some HP Turbine Discs may have been improperly inspected at the cooling air holes. It supports the recommendations in Rolls-Royce Non-Modification Service Bulletin RB211-72-AF996, which provides guidance on addressing this inspection issue. The bulletin does not introduce new mandatory requirements but reinforces existing inspection protocols.
Why it matters
Proper inspection of HP Turbine Discs is critical to ensure engine safety and reliability, preventing potential failures caused by undetected cracks. Aviation professionals, including operators and maintenance organizations, must be aware of this issue to maintain compliance with existing Airworthiness Directives and to safeguard aircraft operational integrity. Failure to address these inspection shortcomings could lead to increased risk and maintenance costs.
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