What is the minimum use height for the autopilot on precision ILS with both engines operating?

The minimum use height for the autopilot on a precision instrument landing system (ILS) approach with both engines operating is 80 feet AGL (Above Ground Level). This limitation is in place to ensure that the flight crew can maintain adequate control of the aircraft and manage any potential failure scenarios effectively, particularly because at this altitude, the flight crew is still capable of visually acquiring the runway environment. Operating with autopilot engaged down to this height aids in stabilizing the aircraft's descent and maintaining precise lateral and vertical guidance as the approach is executed.

Choosing this altitude allows for a balance between automation benefits and maintaining pilot proficiency and situational awareness, especially during critical phases of flight like approach and landing. Lowering the minimum altitude for autopilot use lowers the margin for error, hence it is crucial to respect this limit to enhance safety and operational efficiency during precision approaches.