5. Statistical demonstration tests
As with reliability demonstration tests, statistical tests based on the results of repair or maintenance tests on simulated failures can be used to verify the conformity of a system's maintainability with the requirements of the specification. Numerous types of test have been proposed for this purpose, among which we will describe three from the American standards MIL-STD 471 and MIL-STD 473, which have been used as a model.
5.1 MIL-STD 471 Method 1
This is a sequential test of both average and maximum corrective maintenance times. It assumes that maintenance times follow a lognormal distribution. The ratio between the specified maximum duration and the specified average duration must not exceed 3, and the test is designed to accept the system only if the conditions...
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