GUIDED BOMB UNITS

LEARNING OBJECTIVE: Identify the different types, purpose, use, and operation of guided bomb units.

GBU-12, GBU-16, AND GBU-10

The GBU-12, GBU-16, and GBU-10 guided bomb units (GBUs) (fig. 1-33) are Mk 82, Mk 83, and Mk 84 LDGP bombs modified to detect a target illuminated by a laser beam. The modification consists of a MAU-169 series computer control group (CCG) and MXU-650, 651, or 667 series airfoil group (AFG). Each AFG contains identical items; although they are different in physical size, they perform identical functions. A typical AFG is composed of a folding wing assembly,

Figure 1-33.-Typical guided bomb unit configurations. 

forward adapter assembly, guidance fins, and hardware required for assembly of laser-guided weapons.

The CCG mounts on the nose of the bomb body (this precludes the use of nose fuzing). The CCG detects a laser-illuminated target and provides weapon guidance signals to the moveable guidance fins.

The guidance fins (canards) attach to the CCG and the forward adapter assembly. The canards react to the signals received from the CCG to direct the weapon to the target. The canards are issued with fin extenders, which may be snapped off if wing extenders are not required.

The wing assembly is mounted on the aft end of the bomb body. It adds necessary aerodynamic stability and lift for in-flight maneuvering. An electric tail fuze is installed in the tail of the bomb.

Except for the glass nose of the CCG, all components are painted olive drab, and the bomb body has standard LDGP markings.

GBU-24B/B

The GBU-24B/B (fig. 1-34) is a converted BLU-109A/B 2000 pound class bomb designated as a hard target penetrator (HTP). The associated components required for conversion are fuze, air-foil group, FZU generator, adapter group, and guidance control unit. The heavy walled case of the bomb provides the penetration capability of 4 to 6 feet of reinforced concrete. The GBU-24B/B has a thermal protective coating applied to the surface to extend the cook-off time. The GBU-24B/B must not be missing more than 20 square inches of thermal coating in a single area or more than 40 square inches total.

Figure 1-34.-GBU-24B/B.