What is the minimum height for autopilot operation during approach without a path reference or vertical guidance parameter?

The minimum height for autopilot operation during an approach without a path reference or vertical guidance parameter is indeed 120 feet. This standard is critical for ensuring safety and operational integrity during an approach. Below this altitude, the risk of loss of control increases significantly, as the autopilot may not have sufficient aerodynamic data or references to adequately manage the aircraft's descent.

In situations where vertical guidance is not available, pilots must rely on their training and procedural knowledge to manually manage the plane's descent and landing. The designation of 120 feet provides a buffer for intervention should any issues arise, allowing pilots the time and altitude necessary to disengage autopilot and take over manual control if required.

Understanding this height also aligns with regulations and safety protocols that are designed to mitigate risks associated with autopilot operations, particularly in non-precision approaches.