Downloaded from https://www.everyspec.com ADS-79D-HDBK Airworthiness Credits are not allocated based on flight state measurement error, regime misclassification, or a compromise in data integrity. Usage monitoring equipment is not flight or mission critical; if the system fails, an alternative is to apply the most current Design Usage Spectrum and the associated fatigue methodology for any period of flight time in which the usage monitor data is not available.
Although various CBM system architectures may be used to implement CBM processes such as Structural Usage Monitoring, the CBM system architecture planned for a given aircraft platform should be consistent with US Army infrastructure and outlined in the CBM management plan (see, for example Figure B-1). Figure B-2 and Table B-I describe the processes and data necessary for regime recognition with usage spectrum update. Because all items in the fleet of the same part number are affected by a usage spectrum update, this is often referred to as a ―part number‖ methodology .
Similarly, Figure B-3 and Table B-II describe the processes and data necessary for regime recognition with individual component fatigue damage assessments. Because individual component fatigue damage assessments are performed individually for each serial number item based on its unique usage history, this is often referred to as a ―serial number‖ methodology. Finally, the processes and data necessary for loads monitoring and estimation are described in Figure B-4 and Table B-III. FIGURE B-1. Army flow of data for regimes 43