At what height can the autopilot be used during cruise?

The correct altitude for engaging the autopilot during cruise in a King Air 350 is 1000 feet AGL (Above Ground Level). This limitation is in place to ensure that pilots have sufficient altitude and control over the aircraft during critical phases of flight, such as takeoff and initial climb, when manual flying skills are essential for safety. Engaging the autopilot too soon after takeoff could result in a loss of situational awareness or responsiveness during critical flight dynamics. By waiting until reaching 1000 feet AGL, pilots can ensure that the aircraft is at a stable altitude, reducing the risks associated with early autopilot engagement and allowing for a more effective management of the aircraft's systems and performance as it transitions to cruise flight.