This paper will briefly discuss the importance of algorithms both on the aircraft and at the ground station and provide a system overview for the Aircraft Health and Trend Monitoring System (AHTMS), also known as PlaneConnectHTM™, a standard installation on the Gulfstream G650 aircraft. The AHTMS serves as a data acquisition and processing system to collect and store predefined, information-rich, aircraft parameter data and communicates with a ground station, creating a closed-loop approach that connects the aircraft with ground-based support systems. Recording up to 10,000 predefined parameters, the AHTMS provides nearly real-time aircraft condition monitoring for high priority Crew Advisory System (CAS) events and engine health data. Algorithm development is critical to the success of the AHTMS, and the placement of those algorithms, whether on the aircraft embedded within the Aircraft Health and Trend Monitoring Unit (AHTMU) or at the ground station, is a significant trade-off due to factors such as data processing capability, software modification and deployment, and data transmission times. However, regardless of where an algorithm is implemented, determining when the aircraft deviates from a "normal" state is the essential output of the system.
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