What is the purpose of the rudder boost system in flight?

The rudder boost system serves a crucial function in enhancing aircraft control, particularly in situations where one engine fails. When an engine loss occurs, the thrust imbalance can lead to significant yaw, making it difficult for the pilot to maintain coordinated flight and directional control. The rudder boost system provides additional hydraulic power to the rudder, effectively increasing its effectiveness and allowing the pilot to counteract the yaw caused by the asymmetric thrust. This helps the pilot maintain control of the aircraft, ensuring a safer flight during an emergency situation.

The other options, while important aspects of aircraft performance, do not accurately describe the role of the rudder boost system. It does not focus on fuel efficiency, landing gear deployment, or climb rate improvement, which are addressed by different systems and mechanisms in the aircraft. The emphasis on control during an engine failure highlights the essential nature of the rudder boost system in maintaining stability and safety in flight.