What happens to the green autopilot indication on the PFD during autopilot disconnection?

When the autopilot is disconnected, the green indication on the Primary Flight Display (PFD) will indeed disappear. This visual cue is critical for pilots as it signifies the status of the autopilot system. The green indication normally represents that the autopilot is engaged and actively controlling the aircraft's flight. Upon disconnection, removing this indication serves to alert the pilot that they must now take manual control of the aircraft.

While other potential indications such as blinking or changing color might provide additional information in certain systems, the crucial element here is that the disappearance of the green indication is the primary and most straightforward signal that the autopilot is no longer engaged. Understanding this behavior is fundamental for pilots to ensure situational awareness and proper response during flight operations.