Which switch is pressed to turn on both Flight Directors and disengage the autopilot when airborne?

The TOGA (Takeoff/Go-Around) switch is designed to perform specific functions related to the aircraft's flight management systems, especially during critical phases like takeoff and go-around. When the aircraft is airborne and the TOGA switch is pressed, it activates not only the Flight Directors but also serves to disengage the autopilot if it is engaged.

This functionality is crucial during flight operations as it allows pilots to take manual control of the aircraft immediately after takeoff or during a go-around situation when quick decision-making is vital. The activation of the Flight Directors provides guidance to the pilot for maintaining a desired flight path without the autopilot's aid.

The other options do not have the same effect when pressed. The FLIGHT switch typically pertains to specific configurations of flight management but does not engage or disengage flight systems in the same manner as the TOGA switch. The CLB switch is associated with climb performance management and does not control the Flight Directors or autopilot functions directly. The APPR switch is typically used for approach mode settings and does not disengage the autopilot; rather, it engages specific captures and glide slope functions necessary for landing procedures.