Which feature of the Challenger 300 ensures it can operate safely if an engine fails?

The Automatic Power Reserve feature of the Challenger 300 is particularly vital for ensuring safe operation in the event of an engine failure. This system is designed to automatically adjust engine performance, allowing the aircraft to maintain control and altitude after one engine loses power. It provides an additional layer of safety by ensuring that the remaining engine can deliver sufficient thrust and that pilot workload is reduced during critical situations.

In contrast, while redundant electrical systems, enhanced propeller braking, and dual hydraulic systems contribute to the overall safety and reliability of the aircraft, they do not directly address engine performance in the scenario of an engine failure. Redundant electrical systems help ensure that critical electrical functions remain operational, dual hydraulic systems provide backup control for the aircraft's flight surfaces, and enhanced propeller braking improves stopping capability but do not specifically mitigate the challenges posed by an engine loss. Therefore, the Automatic Power Reserve feature stands out as the primary safeguard in this critical context.