What code will an aircraft squawk if it is blind and NORDO?

When an aircraft is "blind" and has "NORDO" (no radio), it typically squawks 7600. This transponder code is specifically designated for lost communication situations. In the event an aircraft experiences a total radio failure, squawking 7600 alerts air traffic control that the aircraft cannot communicate.

The use of this code is part of a standardized system that helps air traffic controllers and other pilots understand the situation of the aircraft. By squawking 7600, the aircraft indicates it is experiencing a communications issue but is otherwise operational and under the assumption that it can continue to fly safely.

Choosing this code appropriately helps ensure that the aircraft receives necessary attention and any possible guidance from ATC, while other codes, such as 7500 for unlawful interference or 7700 for emergency situations, indicate different circumstances.