Which squawk code is associated with flight emergencies other than hijacking and radio failure?

The squawk code that is associated with flight emergencies, excluding hijacking and radio failure, is 7700. This code is used by pilots to indicate a general emergency situation to air traffic control. When a pilot activates this code on their transponder, it alerts air traffic personnel that the aircraft is experiencing an emergency requiring immediate attention.

In contrast, the code 7500 is specifically designated for situations involving hijacking. The code 1200 represents a VFR (Visual Flight Rules) squawk, which is used when flying under visual rules and does not imply any emergency. The code 4000 is not a standard squawk code related to emergencies and therefore does not indicate an urgent situation for air traffic controllers. By using 7700, pilots convey the need for assistance and a prioritization of their situation without providing the details of the emergency, allowing air traffic control to respond appropriately.