MIL-STD-1530C(USAF)
3.18 Initial quality.
Initial quality is a measure of the condition of the aircraft structure relative to flaws, defects, or other discrepancies in the basic materials or introduced during manufacture of the aircraft structure.
3.19 Inspectability.
Inspectability means that materials and manufactured components (relative to geometry and access) which result from the application of processes and joining methods can be reliably inspected for applicable sources and types of structural flaws using available inspection procedures that meet the minimum probability of detection requirements.
3.20 Maintenance-critical part.
As shown on figure 1, a maintenance-critical part is a structural component whose failure will not cause a safety-of-flight condition but is sized by durability requirements and would not be economical to repair or replace.
3.21 Mission-critical part.
As shown on figure 1, a mission-critical part is a structural component in which damage or failure could result in the inability to meet critical mission requirements or could result in a significant increase in vulnerability.
3.22 Multiple load path.
Multiple load path is structural redundancy in which the applied loads are distributed to other load- carrying members in the event of failure of individual elements.
3.23 Nondestructive inspection (NDI).
Nondestructive inspection is an inspection process or technique that reveals conditions at or beneath the external surface of a part or material without adversely affecting the material or part being inspected.
3.24 Onset of widespread fatigue damage (WFD).
Onset of widespread fatigue damage is the point at which there are cracks at multiple structural details, and these are of sufficient size and density, such that the structure will no longer meet its damage tolerance requirement (e.g., maintaining required residual strength after partial structural failure).
3.25 Probability of detection (POD).
A POD is a statistical measurement of the likelihood, with a specified confidence level, of finding a flaw of a defined size using a specific inspection technique.
3.26 Producibility.
Producibility means that materials, processes, and/or joining methods are able to support current and future production rates without adversely affecting costs and/or quality.
3.27 Risk analysis.
Risk analysis is an evaluation of a potential hazard severity and probability of occurrence. For aircraft structural applications, the potential hazards include structural failures that can cause injury or death to personnel, damage to or loss of the aircraft, or reduction of mission readiness/availability.
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