Method for Investigating Repair/Refurbishment Effectiveness
Abstract
Aerospace systems that fail in service are often
repaired or refurbished and returned to service. 1 2 3
Repair/refurbishment may return the system to the
equivalent of new condition, to some state less than new
condition, or perhaps even to a better than new condition.
Respectively, repair/refurbishment may have no effect on
future reliability, degrade future reliability, or improve it.
Depending on which reliability state the post-failure
repair/refurbishment produces for the system, preventative
maintenance schemes can differ dramatically. For example,
should the repair/refurbishment return the system to a less
than new condition with each subsequent failure, shorter
preventative maintenance intervals as a function of number
of the maintenance cycles increase overall availability and
cost effectiveness. Should the repair/refurbishment return
the system to a better than new condition, longer
preventative maintenance intervals as a function of number
of maintenance cycles increase overall availability and cost
effectiveness.
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