What is the impact of improper exhaust case integrity on engine performance?

• A. It can disrupt exhaust flow and compromise structural integrity
• B. It enhances performance
• C. It has no effect
• D. It only affects cosmetic appearance

Answer: (A)

When the exhaust case does not maintain its proper integrity, the path for the hot gas is no longer a controlled, sealed boundary. That means leaks or gaps can form, and the flow becomes unbalanced or disrupted. Such leaks reduce the pressure differential the engine relies on to drive the turbine efficiently, and any alteration in flow path can cause backpressure fluctuations and a loss of momentum transfer to the turbine stages. At the same time, compromised structural integrity can allow flexing, deformation, or misalignment, increasing vibrations and loading on bearings and casings. All of this leads to reduced thrust and overall efficiency, and it can also raise the risk of further damage from heat and fatigue. In short, improper exhaust case integrity directly degrades performance by disturbing the exhaust flow and compromising the engine’s structural boundary, which is why this option is the best choice.