MIL-STD-1901 Munition Rocket And Missile Motor Ignition System Design, Safety Criteria ForThis standard establishes the design safety criteria for munition ignition systems and associated ignition safety devices used to arm and fire munition propulsion systems.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19 - 20 - 21 - 22 - 23 - 24 - 25

MIL-STD-1901A

TABLE 2. Approved Explosives

Explosive Specification

Comp A3 MIL-C-440

Comp A4 MIL-C-440

Comp A5 MIL-E-14970

Comp CH6 MIL-C-21723

PBX-9407 MIL-R-63419

PBXN-5 MIL-R-81111

PBXN-6 WS-12604

DIPAM WS-4660

HNS Type 1or Type 2 Grade A WS-5003

*Tetryl MIL-T-339

*Tetryl Pellets MIL-P-46464

HNS-IV MIL-E-82903

5.2.2 Pyrotechnic train interruption. When the pyrotechnic train contains material(s) other than those allowed by 5.2.1, at least one interrupter (shutter, slider, rotor, for example) shall separate these materials from the balance of the pyrotechnic train until it is removed during ISD arming as a consequence of an intentional initiation of the launch sequence.

5.2.2.1 Methods of restraint. The interrupter(s) shall comply with one of the following methods of restraint:

a. The interrupter(s) shall be directly locked mechanically in the non-armed position by at least one safety feature. The safety feature shall not be removed prior to intentional initiation of the arming sequence.

b. The interrupter(s) shall be directly restrained mechanically in the non-armed position by at least one safety feature. The safety feature shall be overcome by the

arming energy and shall automatically return the interrupter to a non-armed position upon removal of the arming energy.

5.2.2.2 Interruption position. If the sensitive pyrotechnic element is positioned such that safety is dependent upon the presence of an interrupter, the design shall include positive means to prevent the ISD from being assembled without the properly positioned interrupter. If the sensitive pyrotechnic element is positioned such that omission of the interrupter will prohibit pyrotechnic train transfer, a single interrupter is acceptable.

5.2.2.3 Interruption effectiveness. The effectiveness of the interruption prior to initiation of the arming sequence shall be determined numerically in accordance with MIL-STD-331 Primary Explosive Component Safety Test or by similar methodologies. The results shall be presented and justified to the appropriate service safety authority.