DATA:

BOMBS USED IN

FUNCTIONING

ARMED CONDITION

FUZES USED WITH

ARMING TIME

VANE SPANE

MAX. BODY DIAMETER

OVERALL LENGTH

MATERIAL

Bottle shaped external case is cast aluminum; fuze parts are steel, aluminum alloy, and brass.

GENERAL:

The fuze is essentially a Mk 221 fuze with an external protective bottle shaped cas-ing of aluminum, a vane extension shaft, and 16 vanes instead of four. This casing screws onto the fuze body and is secured by two lock screws. The lower end of the vane shaft has a flattened surface and fits into a slot in the top of the fuze cap, which is attached by screws to the pinion carrier. The fuze has a delay element in the delay carrier similar to the Mk 221, and a celluloid window in the protective casing permits in-spection of the fuze to determind whether or not it is in the armed condition.

OPERATION:

When the arming wire is withdrawn, the arming vanes and the vane shaft rotate. The lower end of the vane shaft engages the cap, which rotates and revolves the pi-nion around the inner gears, operating the reduction gearing. The alignment of the firing pin extension, delay carrier (firing pin carrier in AN-Mk 219), and detonator is similar to that of the AN-Mk 219, see page 235.

REMARKS:

The central spindle in this fuze does not telescope, but the collar on the central spindle which supports the hammer carrier is held by a shear wire which breaks on im-pact as the cap, vane carrier, and striker move forward due to inertia.

Delay element consists of a primer, delay pellet or meal "D" black powder, and speci-al detonator of Fulminate of Mercury mixture; and the auxiliary booster lead in, booster lead-in, and booster consists of tetryl.

The moving parts housing the firing train are held in the fuze by three locking screws.