Downloaded from https://www.everyspec.com ADS-79D-HDBK APPENDIX C STRUCTURAL HEALTH AND LOADS MONITORING C.1 SCOPE This Appendix provides guidance for incorporation of Structural Health Monitoring (SHM) and Loads Monitoring and Estimation (LME) systems into an aircraft system‘s Condition Based Maintenance (CBM) Management Plan. Structural Health Monitoring is a fleet management concept that allows evaluation of the structural health of an aircraft throughout its life cycle based on measured data. The purpose of evaluating structural health is the prognosis of future performance.
Future performance predictions are based on comparing the current state of the structure with initial and degraded system states. The initial state is the ―as manufactured‖ system where structural capability is substantiated by analyses and tests. The reference degraded state corresponds to the minimum structural capability required for the aircraft to perform its intended function. Sensors are utilized to monitor structural degradation due to the service environment experienced by the aircraft in assessing its real time capability for the maintainer, inherent material degradation, and component wear-out. Typical monitoring includes strains/loads and for the presence of structural damage..
Detailed guidance included in this appendix addresses the Structural Health Monitoring system, integrated Non-Destructive Inspection (NDI) methods, load monitoring, load estimation, and limitations on use of vibration measurements. C.2 REFERENCES AND APPLICABLE DOCUMENTS C.2.1 References. (Copies of these documents are available from sources as noted.) C.2.2 Other Government and Non-Government guidance documents. The following documents should be used to complement the guidance of this handbook. (Copies of this document are available at http://www.redstone.army.mil/amrdec/rdmr- se/tdmd/StandardAero.htm ) 61 VARIOUS REFERENCES Rummel, Ward D.
―Recommended Practice for a Demonstration of Nondestructive Evaluation (NDE) Reliability On Aircraft Production Parts‖, Materials Evaluation, Volume 40, No. 9, 1982. Zhao, J., Justin Wu, M. Urban, and Douglas Tristch. ―Optimization of Inspection Planning for Probabilistic Damage Tolerance Design‖, presented at the American Helicopter Society 67th Annual Forum, Virginia Beach, Virginia, May 1-3, 2011. US ARMY AERONAUTICAL DESIGN STANDARD ADS-51 HDBK Rotorcraft and Aircraft Qualification Handbook, 21 Oct 1996.