If an engine shuts down due to overspeed, what happens to the other engine's overspeed system?

If an engine shuts down due to overspeed, what happens to the other engine's overspeed system?

• A. It remains active
• B. Shuts down
• C. Goes into warning mode
• D. No action

Answer: (B)

When one engine experiences an overspeed and is shut down, the protective logic for a twin-engine setup often interlocks the overspeed circuits so the other engine’s overspeed system is taken out of service. This is done to avoid conflicting protections and to simplify single-engine operation during the abnormal condition. In this design, the remaining engine relies on its own control/system rather than having both sides active, making the response cleaner and safer for the immediate situation. In short, the other engine’s overspeed system is shut down (disabled) as part of the coordinated response.

When one engine experiences an overspeed and is shut down, the protective logic for a twin-engine setup often interlocks the overspeed circuits so the other engine’s overspeed system is taken out of service. This is done to avoid conflicting protections and to simplify single-engine operation during the abnormal condition. In this design, the remaining engine relies on its own control/system rather than having both sides active, making the response cleaner and safer for the immediate situation.

In short, the other engine’s overspeed system is shut down (disabled) as part of the coordinated response.