When the Engine Control Switch is moved to isolate, what happens to the engine?

When the Engine Control Switch is moved to isolate, what happens to the engine?

• A. Runs at idle speed and does not develop power
• B. Runs at full power
• C. Shuts down immediately
• D. Overheats

Answer: (A)

Isolating the engine cuts off the fuel supply to the engine. Without fuel, the engine cannot develop power, so it can only run at idle speed rather than producing thrust. It won’t shut down instantly because the engine can continue to run briefly on the remaining fuel in lines and components, but it will not produce power until fuel is restored or the remaining fuel is exhausted. Overheating isn’t a concern here since the engine isn’t being driven at high power.

Isolating the engine cuts off the fuel supply to the engine. Without fuel, the engine cannot develop power, so it can only run at idle speed rather than producing thrust. It won’t shut down instantly because the engine can continue to run briefly on the remaining fuel in lines and components, but it will not produce power until fuel is restored or the remaining fuel is exhausted. Overheating isn’t a concern here since the engine isn’t being driven at high power.