DATA:

BOMBS USED IN

FUNCTIONING

ARMING TIME

FUZES USED WITH

OVERALL LENGTH

MAX. BODY DIAMETER

MATERIAL

ships, plastic vanes.

GENERAL:

This is a VT fuze of the bar type. It is designed to detonate the bomb at a point above the earth which will give effective fragmentation. This fuze, like the M166, is more sensitive to head-on approach to a target than the ring type and less sensitive to "passing" objects. It can be used interchangeably in any bomb which takes the AN-M103A1 when air burst is desired.

At the present stage of development, approximately 90% of the fuzes will function-ing properly upon approach to the target and the remainder will either function sponta-neously after arming but before approaching a target, or will be inoperative.

OPERATION:

When the bomb is dropped, the arming wire is pulled releasing the spring-loaded tur-bine locking pin which jums out freeing the turbine for rotation. The air stream enters the cavity in the fuze head, blow over the air turbine and leaves through the lower ports, around the turbine. The air turbine drives the electric generator mounted in the fuze stem and the gear reduction system. After a minimum number of turbine revolut-ions, the detonator lines up with the booster lead-in and at the same time becomes electrically connected to the firing circuit. The rotor detent in the detonator rotor snaps out into a hole in the rotor housing, locking the detonator in the armed position and at the same time withdrawing from the keyway in the arming stem. The turbine continues to rotate at high speed, driving the generator which has in the meantime activated the VT element and charged the firing condenser. The fuze is now armed.

Upon approach to a target under the proper conditions, the VT element activates the firing circuit which discharges the firing condenser through the electric detonator, initiating the explosive train.

REMARKS:

The fuze differs from previous generator energized bomb nose fuzes in that the en-tire generator and arming system is mounted inside the fuze stem which fits inside of the fuze well. The firing condenser is carried in that part of the body section which is outside of the bomb and will usually be demolished.

The Min. SAT may be extended by use of the M1 (T2E1) Air Travel Arming Delay which clamps onot a bracket around the body of the fuze and prevents the spring-loa-ded turbine locking pin from jumping out, and freeing the turbine until the preset air tra-vel of the M1 (T2E1) device has been completed.

The booster safety pin in this fuze locks the detonator rotor in the unarmed position. Before installation of the fuze in a bomb, the pin should be puled and reinserted. If it cannot be reinserted, the fuze is armed or partially armed and should be destroyed.