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One of the most important reliability parameters is the mean time to failure (MTTF). It is widely accepted that the MTTF is equal to the mean time of life E T . This article shows that this is not necessarily true. Although for the most commonly used statistical distributions (such as exponential, Gaussian, chi-square, Fisher-Tippett distributions) the values of MTTF and E T  are equal, this is not the case for the log-normal distribution. Similarity, some less commonly used distributions (such as Breit-Wigner distribution) may also require calculation adjustments resulting from MTTF ≠ E T . Ignoring this discrepancy, an erroneous MTTF value can be obtained.

Is Mean Time to Failure (MTTF) Equal to Mean Time of Life for Unrepairable Systems?