MIL-STD-1316E
3.23 Interrupted explosive train. An explosive train in which the explosive path between the primary explosives and the lead and booster (secondary) explosives is functionally separated until arming.
3.24 Launch cycle. The period between the time the munition is irreversibly committed to launch and the time it leaves the launcher.
3.25 Main charge. The explosive charge which is provided to accomplish the end result in the munition; e.g., bursting a casing to produce blast and fragmentation, splitting a canister to dispense submunitions, or producing other effects for which it may be designed. Main charge explosives are compounds or formulations such as TNT or Composition B, which are used as the final charge in any explosive application. These explosives, because of
their relative insensitivity, ordinarily require initiation by a booster explosive.
3.26 Maximum No-Fire Stimulus (MNFS). The stimulus level at which the initiator will not fire or unsafely degrade with a probability of 0.995 at a confidence level of 95 percent. Stimulus refers to the characteristic(s) such as current, rate of change of current (di/dt), power, voltage, or energy which is (are) most critical in defining the no-fire performance of the initiator.
3.27 Premature function. A fuze function before completion of the arming delay.
3.28 Primary explosives. Primary explosives are sensitive materials, such as lead azide or lead styphnate, which are used to initiate detonation. They are used in primers or detonators, are sensitive to heat, impact or friction and undergo a rapid reaction upon initiation.
3.29 Safe separation distance. The minimum distance between the delivery system (or launcher) and the launched munition beyond which the hazards to the delivery system and its personnel resulting from the functioning of the munition are acceptable.
3.30 Safety and arming device. A device that prevents fuze arming until an acceptable set of conditions has been achieved and subsequently effects arming and allows functioning.
3.31 Safety feature. An element or combination of elements that prevents unintentional arming or functioning.
3.32 Safety system failure. A failure of the fuze safety system to prevent unintentional arming or functioning.
3.33 Sensor, environmental. A component or series of components designed to detect and respond to a specific environment.
3.34 Sterilization. A design feature which permanently prevents a fuze from functioning.
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