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Appendix B: System Failure Definition/Scoring Criteria |
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|  MIL-T-62531(AT)
APPENDIX B
SYSTEM FAILURE DEFINITION/SCORING CRITERIA
(Guidelines for classification of test incidents)
10. SCOPE
10.1 Scope. This appendix details the guidelines to be used to classify test incidents under
the following categories: No-test, unscheduled and scheduled maintenance, system failures, and
tactical mission failures. The impact of equipment failure characteristics is reduced through
planned maintenance and servicing, which is developed prior to the test. It is necessary,
therefore, to distinguish between test incidents resulting from programmed maintenance, and test
incidents requiring unprogrammed maintenance. With established guidelines, it must be
recognized that incidents requiring performance vary from no effect to catastrophic failure. It is
not possible to have hard rules for evaluating all incidents, therefore, judgement will have to be
exercised in the classification of some incidents.
20. DEFINITIONS
20.1 No-test. Test incidents that are not related to hardware performance, typically will
involve pre-test operations, test site limitations, test item abuse, unrealistic operating conditions,
accidents, improper operation and maintenance procedures, modification kit installation, or
engineering evaluation, are defined as "No-test".
20.2 System failure. A system failure shall be as defined in 40.
30. SCORING PROCEDURES
30.1 Test evaluation. Test incident will be evaluated in accordance with the previous
definitions, and classified in accordance with the chart contained in Appendix C. All
unscheduled corrective maintenance actions will be evaluated for severity, and may be charged
as system failures.
30.2 RAM characteristics. For the purposes of determining the RAM characteristics, the
original scoring of incidents will be subjected to periodic review predicted on institution of
corrective actions. The basis for eliminating failures or maintenance time, in order to arrive at
adjusted values, will be scoring conference consensus that a given modification was satisfactory,
and would therefore, have either precluded the failure (or maintenance time) or substantially
reduced the failure rate for the component.
40. SYSTEM FAILURE
40.1 Definition of system failure. A system failure is defined as any actual or incipient
malfunction of the end item (subject to the exclusions in 40.2.1) that required corrective action
which could not have been deferred:
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