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Method of monitoring gas turbine engine operation

  • US 7,487,029 B2
  • Filed: 05/21/2004
  • Issued: 02/03/2009
  • Est. Priority Date: 05/21/2004
  • Status: Active Grant
First Claim
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1. A method of monitoring the performance of an aircraft-mounted gas turbine engine, the method comprising the steps of:

  • selecting at least one engine parameter to monitor, wherein the engine parameter is indicative of a deterioration condition of the engine as the engine is operated;

    selecting an engine at-limit point corresponding to the parameter;

    selecting an engine warn point corresponding to the at-limit point, where the warn point is different than the at-limit point and provides an operating margin for the parameter between the warn point and the at-limit point;

    monitoring the engine parameter;

    determining a difference in the engine parameter between an actual value and an expected value;

    adjusting a counter value based on the engine parameter actual-expected difference;

    comparing the counter value to the warn point;

    setting a warning flag indicative of an impending maintenance condition when the counter value meets at least a first criterion based on said comparison; and

    indicating to an operator of the aircraft that the warning flag has been set.

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