MIL-STD-1530C(USAF)
3.28 Rotorcraft dynamic component.
A rotorcraft dynamic component is a structural part of the rotorcraft's drive train or lift system that experiences dynamic loading.
3.29 Safe-life.
Safe-life of a structure is that number of events such as flights, landings, or flight hours, during which there is a low probability that the strength will degrade below its design ultimate value due to fatigue cracking.
3.30 Safety-of-flight structure.
Safety-of-flight structure is that structure whose failure could cause loss of the aircraft or aircrew, or cause inadvertent store release. The loss could occur either immediately upon failure or subsequently if the failure remained undetected.
3.31 Single load path.
Single load path is the distribution of applied loads through a single member, the failure of which would result in the loss of the structural capability to carry the applied loads.
3.32 Slow damage growth structure.
Slow damage growth structure is structure in which damage is not allowed to attain the critical size required for unstable rapid damage propagation. Safety is assured through slow damage growth for specified periods of usage depending upon the degree of inspectability. The strength of slow damage growth structure with damage present is not degraded below a specified limit for the period of unrepaired service usage.
3.33 Stability.
Stability means that materials, processes, and joining methods have matured to where consistent and repeatable quality, and predictable costs have been achieved to meet system production requirements. Also, process parameters and methods are understood, and robust and documented approaches for control of these factors (i.e., specifications) exist.
3.34 Structural integrity.
Structural integrity is the condition which exists when a structure is sound and unimpaired in providing the desired level of structural safety, performance, durability, and supportability.
3.35 Structural operating mechanisms.
Structural operating mechanisms are those operating, articulating, and control mechanisms which transmit structural forces during actuation and movement of structural surfaces and elements.
3.36 Supportability.
Supportability means that thermal, environmental, and mechanical deterioration of materials and
structures fabricated using the selected manufacturing processes and joining methods have been identified and that acceptable quality and cost-effective preventive methods and/or in-service repair methods are either available or can be developed in a timely manner.
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