Maintenance is essential in our lives. But especially important is maintenance in order to keep valuable turbines up and running. Note the comments below by Paul Boughton of EngineerLive.com:
Inspections of the hot, turbine section are essential and close examination of the individual turbine blades can reveal issues with overheating. Initial inspections by an experienced service engineer using a borescope can reveal more obvious defects but sometimes a more detailed inspection will be required.