What is suggested during an en route descent to manage speed effectively?

Retarding the throttles during an en route descent is an effective method to manage speed. When pilots reduce thrust by moving the throttle levers back, it decreases the engine power. This allows the aircraft to descend more rapidly while controlling airspeed, as a lower thrust setting generates less lift and allows the aircraft to slow down naturally during the descent.

In controlled descents, maintaining a specific airspeed is crucial for optimal performance and safety, and retarding the throttles helps prevent exceeding the desired speed limits, particularly as the aircraft descends through different air pressure levels. This technique aids in achieving a smooth and efficient descent profile and enables better altitude and speed management in accordance with the flight plan and air traffic control instructions.