| 摘要 |
<p>The present invention is a method of monitoring the health of a fuel system (30) of a gas turbine engine (10). The fuel system (30) comprising a fuel-metering valve (36), a hydraulic control valve servo pressure line (40) and a control pressure line (39). The fuel-metering valve comprises a hydraulic control valve solenoid (36) for metering the flow of fuel and a fuel filter (38) and, in use, a current is applied to the solenoid (38) to control the required fuel demand to fuel nozzles (25). The method comprises the steps of; measuring either the percentage difference between fuel metering valve demand and actual positions or the percentage difference in pressure between the servo pressure line (40) and the control pressure line (39), comparing the differential to a predetermined level, when that predetermined level is reached a warning is given. Thereby the engine may be scheduled for service before unsatisfactory performance of the fuel system is experienced.</p> |
