Before an air-to-ground guided munition will detonate, the fuze requires

• A. An electrical impulse.
• B. A timer signal.
• C. A proximity signal.
• D. A target lock.

Answer: (A)

In electronic fuzes used on air‑to‑ground guided munitions, detonation is triggered by an electrical impulse delivered to the detonator. After the fuze is armed, the firing electronics wait for the triggering event, and when that event occurs, they send an electrical impulse to ignite the explosive train.

A timer signal or a proximity signal by itself isn’t the actual trigger to detonation—the proximity signal helps determine when the event should happen, and a timer can introduce delay in some systems, but the explosion is caused by the electrical impulse to the detonator. A target lock is part of guiding the munition to the target and does not itself initiate detonation.