AN-M139A1, AN-M140A1, M139, and M140 (Nose Mechanical Impact)

Bombs used in

Functioning

M139, AN-M139A1 instantaneous or 0.01 second delay alternative settings. M140, AN-M140A1 instantaneous or 0.025-second delay alternative settings

General: The M139 and M140 are identical in construction to the standard AN-M103, with the exception that the amount of the delay element has been changed to decrease the functioning delay time from 0.1 second (AN-M103) to 0.01 (M139) or 0.025 (M104). All these fuzes have the alternative instantaneous setting.

In order to distinguish these fuzes from the AN-M103, the vane cups have segments painted on them. One eighth of the vane cup of the M139, and one quarter of the vane cup of the M140 is painted black. These markings correspond with those on the Primer Detonator M14. The M139A1 and the M140A1 are the same as the M139 and M140 res-pectively, except that they incorporates the widened arming screw found in the AN-M103A1.

Operation: M139, M140 - Same as AN-M103. AN-M139A1, AN-M140A1 - Same as AN-M103A1

Remarks: The AN-M139A1 and AN-M140A1 are current production and replace the M139 and M140 respectively.

All these fuzes were developed as companion fuzes for the AN-M100A2 series, which uses the Primer Detonator M14 with dealys of 0.01 second or 0.025 second.