Turbine Overhaul (OH) Test 1 Practice

The extent of an over-temperature inspection is governed by the thermal exposure the part experienced: how hot it got and how long it stayed there. Higher peak temperatures accelerate damage mechanisms like diffusion, oxidation, creep, and metallurgical changes, so more severe flaws can develop. The longer the material remains at elevated temperature, the more extensive those flaws can become, which means the inspection must cover more areas, deeper checks, and sometimes disassembly to verify integrity. While factors like cooling rate, RPM, or ambient conditions can influence how heat moves, they don’t set the fundamental scope—that’s driven by the temperature reached and the duration of exposure. Maintenance timing doesn’t determine the extent of the damage either; it’s the actual thermal history of the event. So the correct choice is that the temperature reached and the length of time at that temperature determine how far the inspection should go.