MIL-STD-1540D
5. DETAILED REQUIREMENTS
5.1 REQUIREMENTS ALLOCATION
The system requirements including performance requirements and external interfaces, shall be documented. The allocation of these system requirements to subtier hardware and software shall also be documented as subtier requirements. These system and subtier requirements establish the list of requirements that govern the design process and establish the need for subsequent verification of the hardware and software.
5.2 SERVICE LIFE CYCLE PROFILE
A projection of life cycle events, performance requirements, interfaces, configuration, and associated environmental conditions for an item (unit through vehicle level of assembly) from its completion in manufacturing, through assembly and integration into a flight system, prelaunch, launch and orbital operation shall be documented. The life cycle shall include the various phases an item may encounter in its life, such as: testing, handling, shipping, storage, launch, ascent and on-orbit operations. The combination of environments each item of equipment may encounter at each phase of its life cycle through end-of-life shall be determined.
The following factors should be taken into account:
a. Exposure and duration, to launch vehicle, operational and natural environments.
b. Probability of environmental condition.
c. Configuration of the hardware and applicable software. d. Interfaces with other equipment or software.
e. Other information which helps identify any condition which may influence performance.
5.3 ENVIRONMENTAL DESIGN REQUIREMENTS
Based on the service life cycle profile, the environmental design
requirements shall be established for units, subsystems, vehicles and systems. The design requirements shall include sufficient design margin to assure that the capability of production (flight) articles, including manufacturing variables, exceeds
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