Health and Usage Monitoring System, Blade Tracker Interface Specification
Blade trackers measure: (a) rotor blade height and (b) lead-lag for use in a Rotor Track and Balance (RT&B) function in a Health and Usage Monitoring System (HUMS). HUMS is a generic term for a system used to measure, monitor, process, and store information relating to the functioning and usage of an aircraft's on-board primary systems, including the engine(s).
Rationale: The HM-1 committee has agreed to stabilize this document due to a lack of industry standardization for the blade tracker interface. However, the document contains useful technical information and therefore should not be cancelled.