MIL-STD-1796A(USAF)
3.1.7 Demonstration.
An engineering effort performed to show contractual requirements have been met. Compliance or noncompliance is determined by observation only. Fit and function checks may be accomplished as demonstrations.
3.1.8 Derating.
Using an item such that the stresses applied during operation are lower than the stresses the item was designed to withstand.
3.1.9 Design life.
The period of time during which an item is designed to work within its specified parameters. This may or may not equal the operational service life specified for the system, subsystem, or component-usually defined in terms of service or operation time in years.
3.1.10 Durability.
The ability of a system to resist any degradation requiring maintenance action, including inspection, caused by fatigue damage (cracking and delamination), wear and deterioration/thermal degradation, vibration fatigue, foreign object damage, maintenance- induced damage, and corrosion during normal operational and maintenance usage for the design life.
3.1.11 Durability life test.
Testing to verify that production representative equipment meets performance requirements without catastrophically failing while operating for the equivalent of one design life.
3.1.12 Economic life.
The operational service period during which it is judged to be more economically advantageous to repair than replace a component, based on an evaluation of data developed during system development and/or sustainment. For modules or devices which are designated to be "throw away at failure" (due to low cost, high reliability, or difficulty of repair), the economic life is the point at which their performance or reliability has degraded to an unacceptable level.
3.1.13 Failure.
Any condition which indicates that the electronics will not perform its intended function (BIT
indication, aircrew squawk, equipment malfunction, etc.).
3.1.14 Inspection.
The visual evaluation of physical items, documentation, drawings, etc., for conformance with contractual requirements.
3.1.15 Integrity.
The essential characteristics of systems and equipment which allow specified performance, reliability, safety and supportability to be achieved under specified operational and environmental conditions over a defined design life.
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