ADS-79D-HDBK Downloaded from https://www.everyspec.com Scheduled: Performed at fixed, predetermined intervals, including ―continuous monitoring‖ (where the interval is effectively zero). (SAE JA1012) Scheduled Task: Maintenance tasks performed at fixed, predetermined intervals, or through the use of ―continuous monitoring‖ (where the interval is effectively zero) to prevent or mitigate the consequences of failure or multiple failure. (SAE JA1011) Scheduled Discard: A scheduled task that entails replacing an item at or before a specified age limit regardless of its condition at the time. (SAE JA1011) Scheduled Restoration:
A scheduled task that restores the capability of an item at or before a specified interval (age limit), regardless of its condition at the time, to a level that provides an acceptable probability of survival to the end of another specified interval. (SAE JA1011) Secondary Functions: Functions which a physical asset or system has to fulfill in addition to its primary function(s), such as those needed to fulfill regulatory requirements and those which concern issues such as protection, control, containment, comfort, appearance, energy efficiency, and structural integrity. (SAE JA1011) Sensitivity: Sensitivity is defined as the probability of a true positive, P(detection | target present).
Similarity: Comparison of predicted time series to real (ground truth) time series. Specificity: Specificity is defined as the probability of a true negative, P(no detection | no target present). Structural Health: The ―state‖ of the constituent materials, of the different parts, and of the full assembly of these parts constituting the structure as a whole. Synthesis: The process of evaluating service history and any other relevant data with the objective of validating and, if necessary, refining the performance of an approved credit. (AC 29-2C) Unscheduled Maintenance:
Those unpredictable maintenance requirements that had not been previously planned or programmed but require prompt attention and must be added to, integrated with, or substituted for previously scheduled workloads. Uncertainty: Measure of variability associated with the predictive outcomes and experiments. User: A person or organization that operates and/or maintains an asset or system or may either suffer from or be held accountable for the consequences of a failure of that asset or system. (SAE JA1011) 189