What is the minimum altitude for a controllability check if practical?

The minimum altitude for a controllability check if practical is 6500 feet AGL. This altitude is specified to ensure that there is ample margin above the ground for pilots to safely evaluate the aircraft's handling characteristics without the risk of compromising safety in case of an unusual flight condition. Conducting such checks at this altitude helps pilots maintain better spatial awareness and recovery options if needed, while still allowing them to perform necessary maneuvers to assess control responses effectively.

While the specific altitude requirements can vary, 6500 feet AGL typically provides a balance between safety and the ability to perform the required checks. It ensures that pilots have enough altitude to respond to any potential issues that may arise during the assessment of the aircraft's controllability.