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The current concept of engine condition monitoring was developed in the early 1970s. Since that time Engine Condition Monitoring or Engine Trend Monitoring has since become the cornerstone of many airlines' Flight Operational Quality Assurance (FOQA) and Continuous AirworthinessManagement programs.

FAA Advisory Circular AC-120-17A "Maintenance Control by Reliability Methods" lists the three primary maintenance processes as:

1. Hard Time
2. On-Condition
3. Condition Monitoring

FAA Advisory Circular AC-120-17A further states that Condition Monitoring "is accomplished by appropriate means, and enables an operator to find and solve problem areas." Simply put, engine parameter trend analysis is one aspect of engine condition monitoring. It is the technique of looking at measured or inferentially calculated data for changes from the normal operating condition.

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