The objectives of this chapter are to (1) identify the data needed to determine the times-to-failure distribution, mean life, failure rate, and the reliability with their associated confidence limits, (2) provide sample reliability data acquisition forms, (3) present the final format in which the data should be prepared, (4) provide examples of ways for reducing and presenting these data, and (5) to discuss available reliability data sources for immediate use or for comparing their values with those obtained from in-house tests and analyses.
The reliability and life data needed should, as a minimum, provide the following information:
What component(s) failed?
When and after how many hours, miles, cycles, actuations, rounds, etc. did it fail?
How did it fail?
Why did it fail?
Is it a primary or a secondary failure?
What was the application stress level at failure?
What was the operation stress level at failure?
What corrective action was taken and why?
What was done to the failed component(s)?
How long it took to actively restore the equipment to a satisfactory functioning state?
What was the cost of the corrective action taken in parts, labor, downtime and other?
What was the administrative and logistic time expended in restoring the equipment to successful function?
What recommendations and remarks were made by the personnel assigned to the task?
Report number and initiation date, work completion date, signature and date of personnel assigned to the task, signature and date of approval of report, signature...
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