FMU-140/B DISPENSER PROXIMITY FUZE

The FMU-140/B (fig. 1-19) has an optional arm and fire (timer) mode. It is used with the rockeye II

Figure 1-18.-M2O and M20A1 sensing element antenna pattern.

Figure 1-17.-M2O and M20A1 sensing element proximity _fuze.

Figure 1-19.-FMU-14O/B dispenser proximity fuze.

and Gator weapons. The FMU-140/B is a selfpowered doppler radar device acting as a radar altimeter. Arming times and functioning altitudes are variable and are preflight selectable on the fuze faceplate, located on the side of the fuze. In the proximity mode, if the preselected altitude is reached before the fuze has had time to arm, or the dispenser is released below the pre-selected altitude, the fuze will have the potential to function anytime after arming. If the fuze has not functioned by the time it reaches an altitude of 300 25 feet, it will function at that time.

AIRCRAFT BOMB AMMUNITION AND ASSOCIATED COMPONENTS

LEARNING OBJECTIVE: Identify the purpose and types of aircraft bombs, the safety procedures to be followed during bomb shipment, and the methods used to carry bombs.

Aircraft bombs are released over enemy targets to reduce and neutralize the enemy's war potential. This is done by destructive explosion, fire, nuclear reaction, and war gases. Aircraft bomb ammunition is used strategically to destroy installations, armament, and personnel; and tactically in direct support of our land, sea, and air forces engaged in offensive or defensive operations.

For safety reasons, some bomb ammunition is shipped and stowed without the fuzes or arming assemblies and associated components installed. This ammunition must be assembled before use. Other types, such as cluster bomb units (CBUs), are shipped and stowed as complete assemblies, with fuzs or arming assemblies and associated components installed.

Bombs are designed to be carried either in the bomb bay of aircraft or externally under the wings or fuselage. The general characteristics and basic principles of operation of bomb ammunition and its associated components are described in this chapter. Bombs assembly procedures are discussed in chapter 13 of this manual.