EASA SIB 2009-19: Standard Practices - Turbine Engines Critical Parts Cleaning

What to do

Operators and repair stations should thoroughly review and update their grit blast cleaning procedures to align with original engine manufacturer guidelines, focusing on controlling parameters like stand-off distance and dwell time. They should implement recurrent training for personnel performing these procedures and train inspectors to identify signs of aggressive grit blasting, such as stepped part markings. Any parts suspected of aggressive grit blasting must undergo detailed evaluation before being returned to service, and damage findings should be reported to the relevant European authorities and the engine manufacturer.

Summary

EASA Safety Information Bulletin 2009-19 is an advisory document addressing the cleaning of critical rotating parts in all turbine aircraft engines, including models such as the Pratt & Whitney PW2000 series. It highlights the risk of uncontained engine failures caused by aggressive grit blast cleaning during maintenance. The bulletin aligns with FAA Special Airworthiness Information Bulletin NE-09-34 and applies these recommendations to turbine engines installed on aircraft registered in European Union Member States and associated countries.

What changed

This bulletin introduces a formal recommendation to review and control grit blast cleaning procedures on turbine engine critical rotating parts to prevent excessive material removal. It clarifies that these recommendations apply universally to all turbine engines regardless of their State of Design, not just those of U.S. origin. The document also emphasizes the need for reporting damage to the competent European authorities rather than the FAA, adapting the FAA guidance for European regulatory compliance.

Why it matters

This information is crucial for operators, maintenance organizations, and repair stations to prevent uncontained engine failures that can result from improper cleaning techniques. Ensuring adherence to proper grit blast cleaning parameters helps maintain engine integrity and safety. Compliance with these recommendations reduces the risk of costly engine damage and enhances overall airworthiness and operational reliability.