Structural Health Monitoring Considerations and Guidance Specific to Rotorcraft
|Publication Date:||1 October 2020|
This SAE Aerospace Information Report (AIR) provides guidance on the definition, development, integration, qualification/certif
For the purpose of this document, SHM is defined as "the process of acquiring and analyzing data from on-board sensors in order to determine the health of a structure". Note that this is irrespective of whether the on-board sensors are a permanent or temporary installation. On-board sensors could include any presently installed aircraft sensors as well as new sensors to be defined in the future. Interrogation of these sensors could be done on-board during flight or off-board using ground support equipment during maintenance activities. It is assumed that the primary user of SHM in the near term will be the maintenance and operations crew. This document does not include guidance on SHM business case analysis nor display of health state or recommendations to the flight crew in real-time.
This document has the following major purposes:
• Define key elements of rotorcraft SHM system functionality, including key similarities and differences compared to fixed wing SHM as defined in ARP6461.
• Provide guidance on the implementation of SHM in rotorcraft applications aligned with different application scenarios (e.g., temporary mitigation of fleet structural integrity issue, Condition Based Intervention (CBI) for proactive maintenance versus published schedule, deferment or SHM triggering of traditional visual or NDI inspections or condition-based maintenance for fault-tolerant structures and maintenance practices).
• Establish lessons learned from the development, integration, qualification, certification, and deployment of rotorcraft Health and Usage Monitoring Systems (HUMS) functionality as they relate to SHM.
• Provide guidance on controlled introduction into service and validation of SHM efficacy through combined validation testing and fleet experience.
• Provide guidance on known regulatory requirements and approaches for using SHM to obtain Condition-Based Maintenance (CBM) credits (hereafter referred to as either CBM credits or maintenance credits).
• Provide guidance on how SHM can be incorporated within or as modifications to current maintenance and airworthiness documents.
• Provide input for consideration by airworthiness authorities and regulatory agencies for refinement of guidance related to SHM-based maintenance credits.