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Reply to "Difference between FMEA and FMECA"

quote:
In other words, the survival probability is 90%; the bearing example was simply to illustrate the value of statistical analysis as against 'practical guess-work'. If I know the failure is age-related i.e., patterns A, B or C, then I look for the survival probability to determine the timing of maintenance.

This my whole point - you don't know the pattern and you are unlikely to get sufficient reliable and representative data to get a confident outcome of what the Weibull parameters are - if and IF with capital letters, the pattern even fits the Weibull plot.
Correlations in maintenance with less than 10 valid points are about the minimum in my book.... and these points must contain the same valid shape if you are using Weibull. For example, you cant mix infant mortality failures with wear out failures int he one plot. Weibull cant handle two beta parameters.
RM
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