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is the probability that an item, under the combined influence of
its reliability, maintainability and maintenance support, will be able to fulfil its
required function over a stated period of time, or at a given
point in time. The operating context of a piece of equipment will
determine its performance requirements. An airliner will be
expected to reach its destination once it has taken off. To
guarantee this it will spend a relatively large amount of its
time being serviced. In this case the reliability must be 100%
but it's availability may be relatively low. In process
industries which run continuously the availability is of prime
importance. The definition of availability is:
The availability of a system is the probability
that the system is functioning at time t. The Availability
for a single machine is:
Availability = MTBF/(MTBF+MTTR)
The implication of this formula is that high availability
can be obtained either by increasing the MTBF, and hence the
reliability, or improving the maintainability by decreasing the
Mean Time To Repair (MTTR). The MTTR would include the repair
time and the logistic delay (obtaining labour and spares).
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