Mainstream proposes to develop a compact, self-powered health monitoring system for constant speed drives (CSD) that are found onboard military aircraft.The monitor will be capable of measuring and recording the number of input rotations of the CSD, and has the ability to receive and transmit technical data when required.In addition to monitoring input rotations, Mainstream proposes a hydraulic oil monitoring system that will detect hydraulic oil degradation, contamination, and particle loading with a single analyzer.During the Phase I effort, Mainstream will complete the design of the CSD monitoring device and control algorithms. The development of the system will be generated based of the proposed architecture, and a complete prototype will designed, fabricated, and tested during the Phase I effort to verify system performance prior to a Phase II.The Phase I program is significant because it enables demonstration of all critical components prior to a following effort, thereby reducing technical and schedule risk. During a Phase II program, Mainstream will continue the development of the overall monitoring system and deliver prototypes systems for installation into an actual CSD system for experimental demonstration, and will result in a TRL of 7 at the end of Phase II.