MIL-STD-1911A
5.1.1.3 Explosive train interruption.
a. When an element of the explosive train contains explosive material other than allowed by 5.1.1.2 (e.g., primary explosive), at least one interrupter (shutter, slider, rotor) shall functionally separate it from the lead and booster explosives until the intended arming delay is achieved. The interrupter(s) shall be directly locked mechanically in the non-armed position by at least two independent safety features. The safety features shall not be removed prior to intended initiation of the arming sequence.
b. If the primary explosive is positioned such that omission of the interrupter will allow explosive train transfer to the lead or booster, the design shall include positive means to prevent the HEO from being assembled without the properly positioned interrupter.
c. The effectiveness of interruption for the explosive train in its configuration prior to initiation of the arming sequence shall be determined numerically in accordance with the Primary Explosive Component Safety Test of MIL-STD-331. If the explosive train interruption is removed progressively after intentional initiation of the arming sequence, the relationship between position and its effectiveness shall be established by a progressive arming test conducted in accordance with the Primary Component Safety Test, using a test strategy given by the Projectile Fuze Arming Distance Test of MIL-STD-331. The chosen test strategy, including selection rationale, and results shall be presented to the appropriate service safety reviewing authority.
5.1.1.4 Explosive trains without interruption. When the explosive train contains only explosive materials allowed by 5.1.1.2, no explosive train interruption is required. For non- interrupted explosive train designs, at least two independent energy interrupters, each controlled by an independent safety feature, shall prevent stimulus, equal to or in excess of the initiator's maximum no-fire stimulus (MNFS), from reaching the initiator until the required arming delay is completed. The design of the HEO shall preclude arming if any energy interrupter malfunctions or is absent.
5.1.1.4.1 Electrical initiator sensitivity. The initiator for an electrically fired non-interrupted explosive train shall
a. Meet the appropriate characteristics listed for Class B initiators of MIL-I-23659. b. Not exhibit unsafe degradation when tested in accordance with MIL-STD-1512.
c. Not be capable of being detonated by any electrical potential of less than 500 volts.
d. Not be capable of being initiated by any electrical potential of less than 500 volts, when applied to any accessible part of the HEO after final assembly.
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