Safety and Arming Devices Fuzes

a. General.

(1) The fuzing systems used in guided missile warheads are called safety and arming devices. They arm the system at the required distance and function the warhead at the time and under the circumstances desired.

(2) One or more safety and arming devices may be used in conjunction with any of the warheads described in paragraph 12-7. Depending on the type of target and the effect desired, the safety and arming device may be impact, proximity, ground-controlled, or a combination of two or three of these types. Figure 123 shows a typical safety and arming device.

Figure 12-2. High-explosive fragmentation warhead.
Figure 12-3. Safety and arming device.

(1) Impact. An impact safety and arming device is actuated by striking the target. Functioning time after impact depends upon design of the device and nature of the target.

(2) Proximity. Proximity safety and arming devices function on approach to a target. Each type of proximity device is actuated by some characteristic of, and at a predetermined distance from, the target. The five basic types are

(b) Pressure

(c) Electrostatic

(d) Photoelectric

(e) Acoustic

(3) Ground-controlled. In ground-controlled safety and arming devices, the mechanism for determining target proximity is on the ground instead of in the device. When the proper proximity relationship is reached between the missile and the target, a signal to detonate is sent to the missile.

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