Critical

The process of identifying what work needs to be done with what specific materials, tools, equipment, and documentation. The process also addresses why a specific maintenance approach is taken, while detailing how to accomplish the work. It provides critical information in anticipation of upcoming maintenance activities for scheduling.

A seminconductor memory failure mechanism. Nonvolatile memories are subject to several mechanisms that can cause data to be lost. For floating gate memories, a cell’s data (‘0’ or ‘1’) depends on whether its threshold voltage (VT ) is above or below a critical threshold level (VT,crit). The threshold voltage may shift over time, leading to a change in data. The most common mechanisms for threshold drift are dielectric charge leakage and dielectric charge detrapping. (Reference JEP122F)

Time-critical event that requires immediate action and personnel survival procedures.

The enumeration of defect possibilities into seriousness levels, such as: critical, major, or minor defects.

The rate of crack growth, and the resulting reduction in residual strength, from the time of crack initiation to a crack of critical length.