DATA:

BOMBS USED IN

FUNCTIONING:

ARMED CONDITION

FUZES USED WITH

ARMING TIME

MAX. BODY DIAMETER

OVERALL LENGTH

MATERIAL

Aluminum alloy body, cadmium plated firing pin and stiker brass only train cup.

GENERAL:

These fuzes are identical except for three minor differences: The M109 has an addi-tional spring beneath the striker head, a smaller striker disc, and the arming wire is re-moved from the arming pin when it is released from the plane (AN-M104 arming wire re-movend when parachute opens).

OPERATION:

When the bomb is dropped and the parachute opens, the arming wire is pulled from the arming pin and the spring loaded arming pin flies free. Ejection of the arming pin al-lows the spring-loaded delay firing pin to spring up against the delay primer, starting the pyrotechnic delay train, and permits the spring loaded slider to move against the delayed arming plunger. After 2.5 seconds the 326° pytrotechnic delay train has burned around completely and the body pellet of black powder is ignited. The body pellet igni-tes the delayed arming charge which blows out the delayed arming plug and disc, thereby freeing the delayed arming plunger. The plunger is pushed out by the spring loaded slider as it moves over and lines up under the firing pin. The firing pin is retained only be the weak firing pin spring and on impact, the firing pin impinges on the primer in the slider.

REMARKS:

Since the fuze has a mushroom striker head and a sensitive firing pin, it is a semi-al-ways acting firing fuze and very sensitive if touched at any angle. If the mushroom head is flush with the fuze body and the delayed arming disc is out, then it is assumed that the fuze is in a fired condition and care should be taken not to lift the mushroom striker head away from the fuze body.

AN-M104 has been replaced by the AN-M120A1, and the M109 has been replaced by the AN-M110A1.