MIL-STD-1798C
for "replenishment items" only. This means items such as fire protection tubing (typically not a replenishment item), environmental control system (ECS) ducts, etc., usually are not covered by CSI. If the component is not normally a spare part, it will not be designated CSI. For that reason, not all safety-critical items are CSI, even though all CSI are safety-critical.
3.8 Damage tolerance.
Damage tolerance is the attribute of a component that permits it to retain its required residual strength for a period of unrepaired usage after the component has sustained specific levels of fatigue, corrosion, accidental, and/or discrete source damage.
3.9 Demonstration.
Demonstration is 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.
3.10 De-rating of electrical equipment.
De-rating is the process of operating an electrical component well inside its normal operating limits to reduce the rate at which the component deteriorates. This is done to enhance the component's useful life. An example is: if a diode is specified to be able to operate at 1OV and
5 Amps, and is placed into operation where it sees only 7V and 3 Amps, it is said to have been de-rated for that application.
3.11 Design loads/environment spectrum.
The design loads/environment spectrum is the spectrum of internal and external loads and environments (chemical, thermal, etc.) the equipment is expected to encounter within the design service life. The mechanical equipment must be designed to withstand these loads and environments for the duration of its design service life.
3.12 Design service life.
The design service life is the period of time (e.g., years, flight cycles, operating hours, landings, etc.) established at design, during which the mechanical equipment is expected to maintain its integrity when operated to the design loads/environment/usage spectrum.
3.13 Durability.
Durability is the ability of the system or component to resist deterioration, wear, cracking, corrosion, thermal degradation, and the effect of foreign object damage, for a specified period of time.
3.14 Durability-critical component.
A durability-critical component is a component whose failure may entail costly maintenance and/or part repair and replacement which, if not performed, would significantly degrade performance and operational readiness. These components are not safety- or mission-critical, but may have a major economic impact on the system.
3.14 Durability-noncritical component.
A durability-noncritical component is one whose failure would result in a minor economic impact on the system but would require maintenance and/or repair or replacement to ensure continued performance. These components do not usually require special attention during production and could be maintained on either a corrective- or preventive-maintenance basis.
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