The thrust bearing shown in the illustration has over eight years of ahead running time. Measurements show "i1" is 4 mm and "i2" is 1 mm. 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.

Thrust bearing wear measurements depend on design baselines; differential pad thickness values like 4 mm and 1 mm often reflect engineered pad positioning or tapered configurations rather than catastrophic wear, verifying normal operating condition.