What is a 'hot section' inspection and what components are included?

• A. Inspection of combustor, burners, transition pieces, high-pressure turbine nozzles, and blades for thermal damage, cracks, and coating integrity.
• B. Inspection of the external gearbox casing.
• C. Inspection of the oil pump housing.
• D. Inspection of the inlet duct.

Answer: (A)

Hot section inspections focus on the parts of the engine that operate at the highest temperatures. In this inspection, you examine the combustor, burners, transition pieces, high‑pressure turbine nozzles, and blades for thermal damage, cracks, and coating integrity. These components endure extreme heat and rapid temperature changes, so issues like coating loss, oxidation, cracking, and wear can develop there and threaten performance or safety if not found. The other components mentioned aren’t in the hot section; the external gearbox casing, oil pump housing, and inlet duct are associated with cooler areas or different subsystems and are not the target of a hot section inspection.