MIL-STD-1911A
3.10 Environment. A specific physical condition to which the ordnance may be exposed.
3.11 Explosive train. The detonation or deflagration train (i.e., transfer mechanism), beginning with the first explosive element (e.g., primer detonator) and terminating in the main charge
(e.g., ordnance functional mechanism, high explosive, pyrotechnic compound).
3.12 Firing-control delay. The time elapsed from achievement of the armed condition to the time when controls on the delivery of a firing stimulus are removed.
3.13 Function. An HEO "functions" when its main charge produces an output.
3.14 Hand-emplaced ordnance (HEO). Ordnance that is manually emplaced at, or hand-thrown to, the point of intended function, and requires user action both to begin its operation and to achieve safe separation.
3.15 Independent safety feature. A safety feature is independent if its integrity is not affected by the function or malfunction of other safety features.
3.16 Initiator. A device capable of directly causing functioning of the explosive train.
3.17 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.
3.18 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.
3.19 Primary explosives. Sensitive materials used in primers and detonators to initiate the explosive train. Primary explosives are sensitive to heat, impact and friction, and undergo a rapid reaction upon initiation.
3.20 Render safe. To preclude explosive functioning through the application of special interruption or separation techniques and tools.
3.21 Safe separation. A physical condition or state within the space between the HEO and friendly personnel and equipment that provides an acceptable level of risk from the hazards of the ordnance functioning.
3.22 Safety failure. A failure of the HEO to prevent unintentional arming or functioning.
3.23 Safety feature. An element or combination of elements that prevents unintentional arming or functioning.
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