At what airspeed must a pilot operate during a "slow flight" maneuver?

In a "slow flight" maneuver, the pilot must operate the aircraft just above stall speed. This is critical because the purpose of slow flight is to practice controlling the aircraft at lower airspeeds while maintaining safe margins above the point at which the aircraft would stall. At this stage, the pilot learns how the aircraft responds to control inputs and the effects of reduced airspeed on performance and handling characteristics, without risking an actual stall.

Flying just above stall speed allows the pilot to experience the conditions of slow flight effectively while remaining in a safe operating area. It helps develop skills in recognizing and managing the aircraft’s behavior close to its limit, which is essential for ensuring safety and proficiency during flight operations.

The other choices refer to various speeds that are either too fast or do not align with the concept of slow flight. Just below cruise speed, for example, may not provide the same level of response sensitivity needed for slow flight training. Maximum endurance speed and minimum operating speed may not align with the specific objectives of practicing low-speed maneuvering while ensuring safety above stall conditions.