MNT.4:2 - Problem

A value without its measurand and operating conditions can be misleading. Measurements at different loads or locations may not be comparable. Missing samples can disappear into an apparently smooth trend. A remaining-life estimate can conceal assumptions about future duty that operation will not satisfy.

Even a well-performing predictor can be a poor maintenance arrangement if nobody can interpret the alarm or obtain a feasible response before the relevant deterioration.