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|  MIL-T-62531(AT)
APPENDIX A
c. Inability to commence operation, cessation of operation, or reduction in performance
capability to the extent that a prescribed system fails to perform its intended function.
d. Prescribed unit level corrective actions deferred, or deferable, to the scheduled
maintenance, are to be accomplished without charging a system failure. Incipient
malfunctions of the vehicle detected during prescribed inspections connected with a
scheduled maintenance, will also be corrected without charging a system failure,
unless higher level maintenance is prescribed for the corrective action. In this event a
system failure will be charged if the corrective action was not deferable. A system
failure will also be charged if a malfunction of a subsystem of the end item was
detected during the scheduled maintenance, that would have been made to operate the
affected subsystem prior to the scheduled maintenance (e.g. malfunction of a night
vision device during daylight vehicle operation prior to scheduled maintenance). If
an incipient malfunction of the vehicle was detected during the correction of another
malfunction, two system failures will be charged provided that; the malfunctions were
totally unrelated.
Lessons Learned
4.5.3 Maintenance ratio. To determine conformance to 3.5.3, the vehicles shall not exceed
the maintenance ratio specified.
Verification Rationale
To assure that maintainability requirements specified in 3.5.3 are met.
Verification Guidance
Review test data in accordance with the FD/SC scoring data to determine the MR.
Verification Lessons Learned
3.5.4 Durability. The durability of the vehicle system shall be demonstrated when the
number of component or structural failures that require direct support level of maintenance do
not exceed ______ failures, and do not exceed ______ failures that require general support level
of maintenance or higher.
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