Final answer:
The FMGS stays in Go-Around phase until Activate APPR is selected or the airplane climbs above a set altitude. It ensures pilots have guidance during an aborted landing.
Step-by-step explanation:
The FMGS (Flight Management and Guidance System) remains in the Go-Around phase until the Activate APPR prompt is selected or the aircraft altitude exceeds a predetermined threshold. In the context of aviation, the Go-Around phase is a critical part of the system that allows the aircraft to abort landing and climb to a safer altitude if needed. This mode will provide the necessary guidance to the pilots until they are ready to attempt another approach or take alternative action.