Final answer:
The minimum altitude for practicing stalls in an aircraft varies based on aircraft category, but it should be no lower than 1,500 feet AGL for normal airplanes and 3,000 feet AGL for acrobatic airplanes, according to Federal Aviation Regulations.
Step-by-step explanation:
The minimum altitude for practicing stalls in an aircraft is governed by safety regulations to ensure that there is ample altitude for recovery before the aircraft reaches the ground. The federal aviation regulations specify minimum altitudes for different operations, including stall practice.
In general, the requirement is that the recovery should be completed no lower than 1,500 feet AGL (Above Ground Level) for normal category airplanes and 3,000 feet AGL for acrobatic category airplanes. This ensures the pilot has sufficient altitude to safely regain control of the aircraft and recover from the stall. It's important to note that these altitudes are the minimum requirements and pilots should always allow for additional safety margins when practicing such maneuvers.