 stopping the rotation of a small propeller (unless a lanyard pulls out a pin) so that the striker-pin cannot hit the detonator even if the weapon is dropped on the ground.These types of fuze operate with aircraft weapons, where the weapon may have to be jettisoned over "friendly" territory to allow a damaged aircraft to continue to fly.The crew can choose to jettison the weapons "safe" by dropping the devices with safety pins still attached, or drop them "live" by removing the safety pins as the weapons leave the aircraft.