MIL-STD-1911A
3. DEFINITIONS
3.1 General. The definitions of OD 44811 apply to the terms for explosives. For interpretation of this standard, the specific definitions listed below apply.
3.2 Armed.
a. An HEO is considered armed when any firing stimulus can produce HEO function.
b. An HEO employing explosive train interruption (see 5.1.1.3) is considered armed when the interrupter (s) position is ineffective in preventing propagation of the explosive train with a probability equal to or exceeding 0.005 at a confidence level of 95 percent.
c. An HEO employing an non-interrupted explosive train (see 5.1.1.4) is considered armed when the stimulus available for delivery to the initiator equals or exceeds the initiator's maximum no-fire stimulus.
3.3 Arming delay. The time elapsed from the final commitment to the arming process until the armed condition is attained.
3.4 Booster and lead explosives. Booster and lead explosives are compounds or formulations, such as those explosives listed in Table I of 5.1.1.2, which are used to transmit and augment the detonation reaction.
3.5 Common mode failures. Multiple failures that result from the same cause, such as an adverse environment, or a seemingly unrelated failure. Examples of electrical common mode failures include the failure of two gates on a single digital integrated circuit due to loss of the ground lead to the chip, and failure of two transistors due to exposure to a high temperature environment.
3.6 Credible environment. An environment that a device may be exposed to during its life cycle (manufacturing to tactical employment, or eventual demilitarization). Credible environments include, but are not limited to electromagnetic effects, line voltages, extremes of temperature, humidity, vibration, shock and pressure. Combinations of environments that can be reasonably expected to occur must also be considered within the context of credible environments.
3.7 Credible failure mode. A failure mode that has a reasonable probability of occurring.
3.8 Deployment. The actions that are required to prepare and use hand emplaced ordnance.
3.9 Enabling. The act of removing or de-activating one or more safety features designed to prevent arming, thus permitting arming to occur subsequently.
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