Position and method of fixing in bomb: The fuze is screwed into the nose of the bomb and tightened with a spanner wrench.

Components of explosive train: Incorporated in Navy gaine.

Fuzes likely to be found with: B-2 (a), slightly modfied.

Delay times: Incorporated in Navy gaine.

Threads: 10 threads per inch; RH; diameter, 1 7/8 inches.

Description: The fuze consists of three main parts: the body, striker spindle and arming vane assembly.

The striker spindle is housed in the fuze body and is held in position by a locating screw and a shear wire. The spindle is made in three sections. The upper section, which is ex-ternally threaded to take the arming sleeve, is internally threaded in the top to take the stop screw and internally threaded in the bottom to take the middle section of the spind-le. The lower section of the striker spindle is internally threaded to take the middle sec-tion. The arming vanes and nose cap are attached to the arming sleeve by four screws.

A heavy wire eyelet is attached to the side of the fuze body and serves as a guide for the starting wire. The starting wire is soldered to the nose cap in two places and gives an inital turn to the arming assembly when the bomb is dropped. A safety fork fits into the upper portion of the fuze body, one prong of which extends up through eyelets of arming vane assembly to prevent premature vane rotation.

Operation: On release of bomb, the arming wire pulls the starting wire through the eye-let, breaking it loose at the soldered points and simultaneously imparting an initial rotat- ion to the arming vane assembly. In seven revolution, the arming sleeve rises up the stri-ker spindle to lock against the stop screw and arm the fuze. On impact, the entire as-sembly (vanes, nose cap, sleeve, and spindle) is driven inward, shearing the shear wire, and firing pin pierces the primer.

Figure 120 – A-3 (f) Bomb Fuze.