Lycoming O-235 — Cylinder barrel — Inspection
- Published
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of aircraft with Lycoming O-235 engines not fitted with improved cylinders should inspect cylinder barrels for rust, oil leaks, and cracks during scheduled maintenance. The bulletin recommends a detailed inspection procedure including removal of inter-cylinder baffles, degreasing, applying developer, engine run-up, and fluorescent penetrant inspection if leaks are found. Installing improved design cylinders is advised to mitigate future risks.
Summary
EASA Safety Information Bulletin SIB No: 2009-24 is an informational bulletin addressing inspection of cylinder barrels on Lycoming O-235 engines used in various aircraft. It informs operators about the risk of circumferential cracks in cylinder barrels that can cause oil leaks and potential engine failure. The bulletin highlights improved cylinder designs and provides inspection recommendations to detect corrosion and cracks.
What changed
This bulletin introduces recommendations for repetitive inspections of Lycoming O-235 engine cylinder barrels to identify corrosion pits and cracks. It also identifies specific improved cylinder designs that have eliminated the issue in retrofitted fleets. The bulletin does not mandate actions but advises operators on inspection procedures and encourages installation of improved cylinders.
Why it matters
The bulletin is important for aviation professionals because cylinder barrel cracks can lead to severe engine damage, power loss, and safety risks. Early detection through recommended inspections helps prevent engine failures and costly repairs. Maintenance and compliance teams benefit from clear guidance on inspection methods and part identification to ensure continued airworthiness.
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