MIL-STD-1316E
4. GENERAL REQUIREMENTS
4.1 General. The following general requirements apply to all fuzes and fuze components within the scope of this document.
4.2 Fuze safety system. In order to preclude unintended fuze arming, the fuze safety system shall:
launch.
a. not initiate the arming sequence except as a consequence of an intentional
b. not be susceptible to common-mode failures.
c. not contain any single-point failure mode prior to or at the initiation of the arming cycle.
d. reduce to a minimum single-point failure modes during the arming cycle. The time window associated with these single-point failures shall be reduced to a minimum and shall exist only at or near the expiration of the intended arming delay.
In addition, the fuze design shall prohibit premature fuze arming or functioning if any or all electrical safety or energy control features fail in any given state or credible mode. These failure modes include both random and induced failures which occur prior to, during, or after application of electrical power to the fuze.
4.2.1 Safety redundancy. The safety system of fuzes shall contain at least two independent safety features, each of which shall prevent unintentional arming of the fuze. The stimuli enabling a minimum of two safety features shall be derived from different environments. Utilization in the fuze design of environments and levels of environmental stimuli to which the fuze may be exposed prior to initiation of the launch cycle shall be avoided. Operation of at least one of these safety features shall depend on sensing an environment after first motion in the launch cycle, or on sensing a post-launch environment. An action taken to initiate launch may be considered an environment if the signal generated by the action irreversibly commits the munition to complete the launch cycle.
4.2.2 Arming delay. A safety feature of the fuze shall provide an arming delay which assures that a safe separation distance can be achieved for all defined operational conditions.
4.2.3 Manual arming. An assembled fuze shall not be capable of being armed manually.
4.2.4 Electronic logic functions. Any electronic logic related to safety functions
performed by the fuze shall be embedded as firmware or hardware. Firmware devices shall
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