Type 94 50- and 100-kg.

Type 94 50- and 100-kg. (special).

Type 3 50- and 100-kg.

Type 1 and 2 20-kg. substitute.

Instantaneous Delayed

Color: Natural brass coated with a yellowish green varnish. Fuze may be steel co-lored.

Over-all length: 3 3/8 inches (less gaine).

Over-all width: 1 19/32 inches.

Material of constrcution: Brass throughout except for steel firing pin, steel spring and copper shear-wire.

Position and method of fixing in bomb: Screwed clockwise into nose and locking ring tightened. Both fuze body and locking ring contain spanner wrench holes.

Components of explosive train: Detonator cap, a selective pyrotechnic assembly, and a gaine.

Fuzes likely to be found with: B-1 (a), B-1 (b).

Delay times: Instantaneous or short delay.

Threads: 1 5/32; inches in diameter, 13 threads per inch.

Description: The upper fuze body houses the striker and the firing pin while the lower body portion contains the selective delay assembly. A U-shaped safety wire fits over the arming vanes into holes in the upper fuze body, to prevent premature rotation. The shear wire and spring prevent the firing pin and striker from moving down on the primer after the fuze is armed. The selective delay assembly consists of one channel containing a pyrotechnic train for short delay, an open flash channel for instantaneous action, and a selector switch. Choise of fuze action is made by turning the switch to the vertical or horizontal position in accordance with the Japanese characters and red arrow indicating the setting. A stop stud on the upper fuze body and one an the vane cup prevent the arming vane assembly from jamming too tightly. An Army gaine is threaded into the lower body.

Operation: The arming wire is withdrawn upon release of the bomb and after 10 revolu-tions, the vanes fall free. On impact, the wire is sheared and the striker is forced against the spring. If the selector switch is set for instantaneous action, the flash from the pri-mer passes directly through the open channel to fire a relay which fires the gaine. If the switch is set for delay action, the flash channel is closed and the primer ignites the pyro-technic delay element which in turn fires the relay and the gaine.

Remarks: Fuze armed after 6 rotations of vane; vanes will fall free off after 10 rotati-ons.

Variations of this fuze have been recovered. They are identical with the brass-bodied A-2 (c) except that the upper fuze body and in some cases, the entrie fuze body is made of steel.

Crashed Aircraft Intelligence (India) has found a fuze changing mechanism with each bomb-release mechanism on Army bombers. Operation of the "fuze changer" causes a projecting telescopic arm to rotate approximately 90°. The forked end of this arm will fit into slot of selector switch.

Figure 94 – A-2 (c) Bomb Fuze.