Critics: Invalid Concept For Modern Complex Systems
Some investigations in the aerospace and other industries have discovered that most failures do not comply with the bathtub curve. It is argued that the bathtub curve is an old concept and should not be used as a stand alone guide to reliability. Most interesting in these investigations was the conclusion that wear-out issues in complex systems only count for about 4% of all failures (refer to Reliability centered maintenance (RCM); Boeing 747 - MSG2 and MSG3 investigations). According to "The RCM approach" about 6 different types of failure rate curves can be distinguished. It is also remarkable that the highest contribution to failures appear to be failures that have a constant failure rate character. This mainly counts for complex systems, being highly integrated.
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