What is the minimum altitude for autopilot disconnection during an approach?

The minimum altitude for autopilot disconnection during an approach is 200 feet above the threshold. This limitation is set to ensure that pilots have sufficient altitude to take manual control of the aircraft during critical phases of the approach and landing, allowing time to assess conditions and respond to any in-flight irregularities.

Disconnecting the autopilot at this altitude provides an additional safety buffer, ensuring that pilots are actively engaged with the aircraft and capable of making necessary adjustments as they approach the runway. This altitude consideration is part of ensuring pilots are not overly reliant on automated systems, particularly when the aircraft is at low altitudes and in a critical phase of flight where precision and decision-making are essential.

The other options represent altitudes that are either too low, which would not provide adequate time for pilots to react and take control, or too high, which would not align with operational safety protocols set forth for approach and landing procedures.