Classification
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Definitions
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Failure, Relevant
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A failure that has been verified and can be expected to occur in normal operational use. Relevancy indicates whether a specific failure should “count” in the calculation of reliability. (See Failure, Chargeable below.)
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Failure, Non-Relevant
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A failure that has been verified as having been caused by a condition not defined for normal operational use.
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Failure, Chargeable
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A relevant primary failure under test, and any secondary failures resulting from a single failure incident. This definition of failure is typically limited to formal, contractually required reliability tests (performed in-house or in the field).
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Failure, Non-Chargeable
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A non-relevant failure, or a relevant failure caused by a previously agreed to set of conditions that eliminates the assignment of failure responsibility to a specific functional group. This definition of failure is typically limited to formal, contractually required reliability tests (performed in-house or in the field).
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Failure, Pattern
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The occurrence of two or more failures of the same part or function in identical or equivalent applications, where the failures are caused by the same basic failure mechanism, and the failures occur at a rate inconsistent with the expected failure rate.
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Failure, Multiple
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Simultaneous occurrence of two or more verified independent failures. When two or more failed parts are found during troubleshooting, and assignable causes cannot be verified as dependent, multiple failures are presumed to have occurred.
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