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Mean Active Maintenance Down Time (MAMDT) is associated with Planned Maintenance System support philosophy. This is average amount of time while the system is not 100% operational because of diagnostic testing that requires down time.

For example, an automobile that requires 1 day of maintenance every 90 days has a Mean Active Maintenance Down Time of just over 1%.

This is separate from the type of down time associated with repair activities.

Source: Mean Active Maintenance Down Time (MAMDT)