FAA SAIB NE-06-52 - Rolls-Royce Corporation 250-C30, -C40 and -C47 series Engines Combustor Liners
- Published
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators should monitor operating temperatures and power output to ensure they remain within approved limits. At the next combustion section access, any liner with Hastelloy X mixing cups should be replaced with the approved L605 material liner. No immediate mandatory action or airworthiness directive compliance is required, but adherence to these recommendations is advised.
Summary
EASA Safety Information Notice 2007-02 is an informational bulletin addressing issues with combustor liners in Rolls-Royce Corporation 250-C30, -C40, and -C47 series engines. These engines are installed in helicopters including Bell models 206, 230, 407, and 430; MD Helicopter models 369F, 369FF, and 600; and Sikorsky model S76A. The notice highlights concerns about the use of an unapproved material, Hastelloy X, in combustor liner mixing cups, which may affect engine performance.
What changed
This notice introduces awareness of a material discrepancy in certain combustor liners where Hastelloy X was used instead of the approved L605 material. It references FAA Special Airworthiness Information Bulletin NE-06-52, which identifies specific liner part numbers and the potential degradation issue. No new regulatory requirements are imposed, but recommendations for inspection and replacement are provided.
Why it matters
This information is critical for aviation professionals to ensure engine reliability and safety by preventing gradual combustor efficiency loss and potential increases in fuel flow and turbine temperature. Operators and maintenance organizations must be vigilant about the materials used in combustor liners to avoid performance degradation and maintain compliance with approved engine specifications.
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