WrenchBender From Canada, joined Feb 2004, 1779 posts, RR: 8
Reply 2, posted (5 years 7 months 3 weeks 5 days 5 hours ago) and read 9535 times:
It's been a while and I was qual'd on the -27. Borescope is the start but any indication of a problem usually involves splitting the casing for a closer look and possible repair. All I can say is be prepared for the worst.
T prop From United States of America, joined Apr 2001, 1033 posts, RR: 1
Reply 3, posted (5 years 7 months 3 weeks 5 days 3 hours ago) and read 9521 times:
It's been years since I've been in a PT6, but I remember it was assigned based on trend or something timed out. First they would have us looking for air leaks, indication systems cal check, and then a chem wash. If that didn't help we would split the engine open and of course find that the CT vane ring was toast. I don't recall borescopes being carried out to often, everytime we were tasked to open one, it was either for bad ITT components or the CT disc and vane ring was bad. We used stuff from Turbopower in Miami (don't know if they still exist) and their kits were great, never had to grind...