What is the primary purpose of verifying turbine exhaust case integrity during overhaul?

• A. Ensure exhaust flow is unimpeded and the casing remains structurally sound
• B. Maximize fuel efficiency
• C. Improve combustion chamber cooling
• D. Reduce accessory gearbox wear

Answer: (A)

The main idea is to keep the exhaust flow path clear and the casing strong. The turbine exhaust case sits in the hot gas path and must withstand high temperatures, pressures, and vibration. If there are cracks, dents, delaminations, or fastener issues, leaks or gaps can open up in the casing, disrupting the designed flow and altering clearance and pressure distribution. That can lead to reduced efficiency, uneven thermal loads, increased vibration, and in the worst case, structural failure in the hot section.

During overhaul, verifying integrity means inspecting for cracks, corrosion, deformation, and loosened or damaged joints, and confirming the casing maintains proper dimensions and sealing interfaces. When the exhaust case is sound and the flow path is unobstructed, the engine maintains reliable exhaust routing, expected performance, and safety.

Other options miss the point because they address overall efficiency, cooling of another area, or unrelated wear, none of which are the primary purpose of checking the exhaust case during overhaul.