What must the autopilot preflight check be?

The autopilot preflight check must be satisfactory to ensure that all systems are functioning properly before flight. This check is crucial for flight safety, as it verifies that the autopilot can respond correctly to commands and maintain the desired flight path. A satisfactory preflight check means that the autopilot has passed all its necessary checks and is confirmed operational.

In the context of aviation safety, ensuring that the autopilot is functioning correctly helps prevent mechanical failures that could compromise the safety of the flight. This process is part of standard operating procedures and is not merely a suggestion or optional step; it is a mandatory practice for pilots. Other terms, such as "passed," while they may imply a level of success, are too vague compared to "satisfactory," which emphasizes the thoroughness required in the preflight procedure. "Immediate" does not adequately describe the outcome of the check and does not convey the essential nature of a satisfactory status.