The thrust bearing shown in the illustration has over eight years of ahead running time. Measurements show "i1" is 4 mm and "i2" is 1mm. Which of the following conditions is indicated and what steps should be taken, if any? Illustration MO-0121

Correct Answer: Option A — No appreciable wear has occurred, and the proper maintenance procedures should continue to be followed.

Long-term operation inevitably causes minimal micro-wear on thrust pad surfaces. The noted clearances confirm that adequate oil wedge formation and acceptable axial displacement remain intact, meaning no abnormal degradation has occurred and standard maintenance practices should continue.