What occurs if the Automatic Deployment Unit (ADU) is left in AUTO?

When the Automatic Deployment Unit (ADU) is left in the AUTO position, it is designed to function with the intent of ensuring safe deployment of the system. In this context, if the ejection seat is activated and there's pilot/seat separation, the ADU will automatically deploy the parachute after a specific predetermined time, which is 4.0 seconds after that separation occurs. This feature serves to provide a safe descent for the pilot, allowing adequate time for the ejection seat to reach a safe altitude for parachute deployment before the parachute is released.

The other options do not accurately describe the function of the ADU when in AUTO. The ejection seat is designed to function correctly when needed, so it would not be disabled in this mode, and instant deployment of the parachute would not ensure the safety of the occupant, as it would likely lead to complications during descent. Similarly, locking the seat in position does not align with the operational intent of the ADU, which seeks to facilitate a successful ejection and parachute deployment.