MIL-STD-1796A(USAF)
the operational mission capability, or (c) significantly increase the system vulnerability during a critical mission. This is sometimes referred to as "mission abort critical function."
3.1.22 Non�critical.
A term applied to a function, equipment or item whose loss does not affect flight safety or mission capability. An example would be a cockpit video recorder used to provide visual aids for debriefing.
3.1.23 Opportunistic maintenance.
Maintenance performed on an item when it is "down" already having some other maintenance performed.
3.1.24 Parts integrity.
The assurance that an electronic component and/or subcomponent will perform according to its specification and comes from a trusted source without risk of containing malware, containing malicious code, containing malicious circuitry, being counterfeit, or having counterfeit elements.
3.1.25 Preventive maintenance.
Systematic inspection, detection and correction of incipient failures either before they occur or before they develop into major defects. For example, periodic adjustment and lubrication of mechanical parts and dry gas purging of optical cavities are included in the definition of preventive maintenance, sometimes referred to as periodic maintenance.
3.1.26 Safety critical.
A term applied to any condition, event, operation, process, or item whose proper recognition, control, performance, or tolerance is essential to safe system operation.
3.1.27 Safety Critical Function (SCF).
Top-level air vehicle or system functions whose loss could potentially result in loss of air vehicle and life. This includes functions such as control of engine, take-off, landing, aerial refueling, terrain following, altitude indication, in-flight restart, fire detection, attitude indication, fuel quantity indication, control of flight, heading indication, etc.
3.1.28 Scheduled maintenance.
Preventive maintenance and/or maintenance that can be scheduled and performed in advance of a failure or to prevent premature failure.
3.1.29 Supportability.
The ability of the equipment to be kept in a state of operational readiness.
3.1.30 Test.
An empirical effort performed to show that requirements have been met. Documented procedures, instrumentation, and known environmental conditions are normally applicable. Compliance or noncompliance is determined by observation, where practical, and evaluation of
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