MIL-STD-1901A
4 GENERAL REQUIREMENTS
4.1 Ignition Systems
4.1.1 Ignition system design. The design of the ignition system shall take into account the aggregate of devices in the weapon system (munition, launcher, and munition launch platform) which generate and control the operating signal to cause the munition propulsion system to function.
4.1.2 Ignition safety device. The design of the munition employing a missile or rocket motor shall include an ignition safety device, based on munition system requirements, complying with the requirements of this document. The design of the ignition safety device shall be compatible with the ignition system(s) for the proposed platform(s).
4.2 Analyses. The following analyses shall be performed to identify hazardous conditions for the purpose of their elimination or control.
a. A preliminary hazard analysis (PHA) shall be conducted to identify and classify, per MIL-STD-882 appendix A, hazards of normal and abnormal environments, as well as conditions and personnel actions that may occur in the phases before and during intentional arming (or firing) of the IS. This analysis shall form the basis for preparation of system design, test, and evaluation requirements.
b. System hazard analyses and detailed analyses, such as fault tree analyses and failure mode effects and criticality analyses, shall be conducted to arrive at an estimate of the safety system failure rate and to identify any single point, common mode, or other credible failure modes that could result in inadvertent or premature arming or firing of the munition. These analyses shall include an assessment of the relative sensitivity of each component in the pyrotechnic train.
c. For the IS or ISD containing an embedded computer, microprocessor, micro- controller or other computing device, the analyses shall include a determination of the contribution of the software, firmware, or micro-code (see 4.8) to the enabling of a safety feature.
d. Where the software is shown to directly control or remove one or more safety features, a detailed analysis and testing of the applicable software shall be performed to ensure that no design weaknesses, credible software failures, or credible hardware
failures propagating through the software can result in compromise of the safety features.
e. For an IS or ISD containing Application Specific Integrated Circuits, Programmable Gate Arrays, or similar devices, the analyses shall include a determination of the safety criticality of these devices to the arming and functioning of the system. Detailed safety analyses and tests shall be performed on those devices shown to be safety
8
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business