monitor which for example only senses and tracks the position of the seal retaining sleeve 84 relative the shaft bore 80 which monitors wear of the shaft seal 82 alternatively or additionally the sensor system s may be utilized to detect any fuel leakage past the shaft seal 82 and into the seal retaining sleeve 84 and the shaft bore 80 it should be understood by those skilled in the art with the benefit of this disclosure that these functions may be enacted in either dedicated hardware circuitry or programmed software routines capable of execution in a microprocessor based electronics control embodiment in one non limiting embodiment the module may be a portion of a flight control computer a portion of a central vehicle control an interactive vehicle dynamics module a stand alone line replaceable unit or other system the seal retaining sleeve 84 may alternatively or additionally include anti rotation features 92 such as flats illustrated fig1 grooves keys or other features to further rotationally assembly proof and align the seal retaining sleeve 84 for specific leakage performance and assembly monitoring with reference to fig1 the seal retaining sleeve 84 defines an overall axial length sa along the axis of rotation a and an outer diameter dimension sd of the radial end flange 86 it should be understood.