FMU-139
Type: system
Definition
FMU-139 is a U.S. military electronic tail fuze used on general-purpose bombs (notably the Mk-80 series) to control arming and warhead initiation based on the selected employment mode. In practical terms, it provides configurable functioning options such as impact (and, in some configurations, proximity-related employment when paired with a sensing element), with selectable delay/arm settings set either manually on the fuze or through aircraft/aircrew programmability on newer variants.
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