ADS-79D-HDBK Downloaded from https://www.everyspec.com K.4 GENERAL GUIDANCE K.4.1 Purpose This section of the V&V document was prepared to outline the hardware and software processing elements in the Continuing Airworthiness Plan, as well as user documentation that must be identified and controlled as part of the V&V process. K.4.2 Discussion There are many factors that must be controlled to ensure that a baseline credit configuration has been defined and that proper documentation exists prior to formal V&V Credit testing. CBM systems are unique in that both airborne and ground elements very often make up the end-to-end Credit processing application.
In general a credit application will need to show that all of the elements contributing to the final credit result are defined and have been controlled. We use the word ―contributing‖ to note that it may not be possible or practical to have collected all of the data with systems of the exact configuration . For example, the software used during V&V might not be configured to measure a Conditions Indicator for an unrelated measurement, or thresholds for unrelated CI‘s might have changed over time. It is likely that some analysis will be required to show that the configuration baseline is controlled and all testing is relevant to the credit being pursued.
Figure K-1 shows the top level elements of a generic CBM system architecture. The figure shows that a typical CBM system is made up of 3 or 4 different major processing elements. Incremental CBM data is collected in the airborne system and further processed in the ground station or portable maintenance aid. In some cases the end-to-end credit processing is not completed until the data is passed to the operator‘s Maintenance Management System. FIGURE K-1. Top level system elements 190