If an engine is shutdown by the over-speed protection system, the other engines over-speed protection systems will be ___.

• A. Activated
• B. Remain Active
• C. Fail Safe
• D. Deactivated

Answer: (D)

When one engine is shut down by its overspeed protection, the system deactivates the overspeed protections on the other engines. This prevents a cascade of automatic shutdowns from a single fault or abnormal signal, allowing the aircraft to continue operating on the remaining engines. If the other protections stayed active, a shared fault or sensor anomaly could cause additional engines to trip, which is undesirable in an in-flight emergency. Keeping the remaining engines’ protections deactivated gives the crew time to manage the situation and maintain control with the engines still running.