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|  MIL-T-62531(AT)
APPENDIX A
Verification Rationale
Availability of support equipment is required to minimize downtime and maximize time
available for mission operational requirements.
Verification Guidance
Insert in the blank space the minimal available percent figure required.
Verification Lessons Learned
3.5.3 Maintenance ratio. The maintenance ratio is an index which establishes a relationship
between the total time required to perform maintenance and the total mission operating time in
hours. The maintenance ratio shall not exceed ______ and shall be based on the following
relationship:
T
MR = M
Where:
MR = Maintenance Ratio
T = Total maintenance time (hours) expended to perform
scheduled and unscheduled maintenance covering the
total vehicle system operating time period.
M = Total mission time (hours).
Rationale
To provide assurance that the vehicles are cost effective from a maintenance standpoint and
that the maintenance support meets specified requirements.
Guidance
Insert the maximum acceptable maintenance ratio figure in the blank space.
A system failure is defined as any actual or incipient malfunction of the vehicle that requires
corrective action which could not be deferred:
a. Until the next scheduled maintenance (exclusive of lubrication services) if unit
maintenance is prescribed for correction.
b. For the remainder of its specified life before overhaul, replacement, rebuild or
salvage.
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