What characterizes a powered descent?

A powered descent is characterized by the utilization of engine power to control and manage the aircraft's flight path during descent. This technique allows pilots to adjust their descent rate and angle, making it easier to maintain optimal flight control and ensure safe landing conditions. By using power, pilots can effectively counteract any loss of altitude caused by increased drag or other factors, stabilizing the aircraft's approach and ensuring precision in navigation and landing.

The other options do not align with the definition of a powered descent. A descent without power would indicate a gliding descent, where the aircraft is descending solely due to gravity without engine assistance. A descent involving no lift essentially describes a scenario contrary to flight principles, where the aircraft would not be in a controlled flight maneuver. Furthermore, a descent at a constant speed suggests a specific descent profile but does not necessarily imply the use of engine power, as the descent could still occur without power management.