Technical and Oversight Considerations for Reliable SHM Utilization

Abstract

As the use of Structural Health Monitoring (SHM) systems continues to expand, the key elements associated with proper performance assessments and oversight requirements are becoming very well-defined. Similarly, supporting developments such as SHM guidance, regulatory measures, quality assurance and training are progressing to build a firm foundation for SHM deployment. Extensive SHM studies have highlighted the viable use of in-situ sensors for real-time health monitoring of a myriad of structures across multiple industries. SHM use can overcome inspection impediments stemming from accessibility limitations, complex geometries, and the location and depth of hidden damage. A critical aspect to applying SHM solutions is determining the operational requirements for SHM systems and the full array of variables that must be considered in the assessment process. In the case of the aviation industry, OEMs, airlines, regulators and researchers have worked together to define a detailed process for determining how to safely adopt SHM solutions. Multiple, formal SHM certification efforts have been completed to exercise and define the process of validating SHM systems. SHM certification must address the full spectrum of issues ranging from design to performance and deployment to continued airworthiness. This paper will provide an update on SHM deployment and certification in several aircraft applications, streamlined processes for airline adoption and recent FAA and industry initiatives to aid thorough evaluations of SHM systems. An FAA Issue Paper now provides essential guidelines for SHM system designers and procedures for assessing the performance of SHM systems. Formal documents have been issued by aircraft manufacturers to accommodate SHM usage. The Aerospace Industry Steering Committee for SHM has published multiple, essential standards for integrating and certifying SHM use on aerospace structures. These efforts are allowing SHM solutions to quickly and properly support maintenance activities while establishing policies and guidance to ensure the safe, uniform and comprehensive certification of SHM systems. Furthermore, this foundation will foster expanded regulatory and industry guidance as SHM efforts ultimately move towards Condition Based Maintenance programs.