When performing a hot section borescope inspection, what is primarily being looked for?

• A. Cracks, deposits, erosion, blade damage.
• B. Oil level.
• C. Fuel contamination.
• D. Sensor calibration.

Answer: (B)

The goal of a hot section borescope is to inspect the high‑temperature parts of the turbine—such as the combustor area, transition pieces, nozzle sections, and turbine blades—for signs of degradation that could impact performance or lead to failure. You’re looking for cracks that might grow under heat and stress, deposits from combustion or oil leakage, erosion from particle impact, and any damage to blades or shrouds that could cause performance loss or imbalance. These indicators directly reflect the health of the hot section and help determine if component repair or replacement is needed.

Oil level isn’t assessed by a hot section borescope; the lubrication system’s oil level is checked through lubrication subsystem methods and indicators. Similarly, fuel contamination and sensor calibration are addressed by other maintenance checks and tests, not by visually inspecting the hot section with a borescope. The key takeaway is that this inspection focuses on observable wear, deposits, and damage in the hot section that could affect engine operation.