Abstract
To aid the application of Ferrogaphic analysis to machine condition monitoring, a programme of trend analysis of gas turbine engines of the same type in the fleet of a single operator was carried out using the direct reading Ferrograph. The most informative method was found to be cumulative plots of the total wear and severity of wear on the same graph. Convergence of the curves gives an early warning of uncharacteristic trends which should be investigated by full Ferrographic analysis; a cross-over of the curves indicates that urgent action is required.
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