What happens to engine power as the aircraft descends?

As an aircraft descends, engine power is typically decreased. This reduction occurs because the descent generally involves a need for less thrust to maintain a controlled descent angle and speed. When an aircraft is descending, it no longer needs to produce the same amount of lift and thrust as during level flight or ascent, allowing for a reduction in engine power.

In a controlled descent, pilots often adjust the throttle to a lower setting, which helps optimize fuel efficiency and decreases wear on the engines. While some variations may occur depending on the specific flight profile or situation, the fundamental principle is that less power is required during descent compared to levels of flight where the aircraft is climbing or cruising.