I just had a borescope on both engines of my 425 during the fuel nozzle cleaning and some of the CT blades were diagnosed with stage 1 sulfidation. The photo below is probably the worst blade. Some blades have almost none but the left engine has at least some on almost all the blades. These engines are 2400 SOH and my HSI is due in about 350 hours (2+ years). This is the 2nd run on these engines and I believe these are the original blades. I am just curious what my options will be at HSI. Replace with PMA blades, try to overhaul the existing blades, or do nothing (if they are serviceable). I plan to keep the airplane for a while and run the engine past TBO. Just wondering what people usually do in this situation. Thanks for any advice.

Hire Paul Jones at Specialty Turbine. He is the man. I just had an HSI and I had some expensive issues. PM me if you want more info. Or do a search in the turbine forums for his name.

+1 on Paul Jones!

I'd call Keith at Covington and take my airplane/engine to Tunica MS...…..IF it needed work...…..those guys are straight up shooters and won't be taking you for no joy ride...….

+1 for Paul Jones again.

Paul walked me and the seller of mine on some serious blade issues on a set of PT-6. Saved the deal and seller probably 50%