What is the main feature of a locked-wheel arming circuit?

The main feature of a locked-wheel arming circuit is that it is inoperative at taxi speeds. This is important because the function of the locked-wheel arming circuit is to prevent unintentional activation of certain systems that could lead to loss of control during low-speed operations, such as taxiing. By being inoperative at these slower speeds, safety is enhanced, allowing pilots to manage the aircraft more effectively during critical phases like taxiing where precise control is necessary.

In contrast, the arming circuit may become active during higher speeds, such as during takeoff, ensuring that necessary safety features engage only when they are needed, thereby preventing premature activation that could result in unnecessary complications.