Downloaded from https://www.everyspec.com ADS-79D-HDBK modified inspection and removal criteria of components based on measured condition and actual usage utilizing systems engineering methods. Condition Based Maintenance (CBM) is a set of maintenance processes and capabilities derived primarily from real-time assessment of system condition obtained from embedded sensors and external test and measurements using portable equipment. CBM is dependent on the collection of data from sensors and the processing, analysis, and correlation of that data to material conditions that require maintenance actions.
Maintenance actions are essential to the sustainment of materiel to standards that ensure continued airworthiness. Data provide the essential core of CBM, so standards and decisions regarding data and their collection, transmission, storage, and processing dominate the requirements for CBM system development. CBM has global reach and multi-systems breadth, applying to everything from fixed industrial equipment to air and ground vehicles of all types. This breadth and scope has motivated the development of an international overarching standard for CBM. The standard, known as ISO 13374:2003, ―Condition Monitoring and Diagnostics of Machines,‖ provides the framework for CBM.
This handbook is supported by the Machinery Information Management Open Standards Alliance (MIMOSA), a United States organization of industry and Government, and published as the MIMOSA Open Systems Architecture for Condition Based Maintenance (OSA CBM) v3.2. The standard is embodied in the requirements for CBM found in the Common Logistics Operating Environment (CLOE) component of the Army‘s information architecture for the Future Logistics Enterprise. The ISO standard, the OSA CBM standard, and CLOE all adopt the framework shown in Figure 1 for the information flow supporting CBM with data flowing from bottom to top.
This document, however, considers the application of CBM only to Army aircraft systems and Unmanned Aircraft Systems. FIGURE 1. ISO-13374 Defined data processing and information flow 4.2 Universal Guidance . CBM practice is enabled through three basic methodologies: a. Embedded diagnostics/prognostics for components that have specific detectable faults (example, drive systems components with fault indicators derived from vibratory signature changes and sensors acceptable for tracking corrosion damage). See Figure 2 for Ideal sensor behavior. b.
Usage monitoring, which may derive the need for maintenance based on parameters such as the number of power-on cycles, the time accumulated above a specific parameter value or the number of 15