Patent ID: 9169742
Filing Date: 2015-10-27
Classification: F01D,F05D,G01R,Y02T

Abstract:
1. A circuit useful for distinguishing between an electrical fault and a shaft shear failure in a gas turbine engine, the circuit comprising: a plurality of probes, each probe associated with a respective resistor having a predetermined range of resistance, and each probe being disposed in an engine adjacent a rotary mounted shaft component, whereby mechanical interference between any of the plurality of probes and the shaft component renders the corresponding associated resistor substantially non-conductive; and at least one sensor processor configured to determine an operational status of each probe, based on a measured resistance to current conducted through each probe, and to generate a fault code when the measured resistance associated with at least one of the plurality of probes is not within the predetermined range of resistance; wherein the fault code generated by the at least one sensor processor is indicative of a shaft shear failure when the measured resistance to current conducted through each of the plurality of probes is substantially infinite; wherein: