Maintainability is actually just one dimension of system design and a system’smaintenance management policy. For example, it could be required from the designer that only three screws are acceptable on a certain partition panel in order to get speedy access inside. However, this request has to be placed into a larger context and it becomes a trade-off. If the item behind that panel needs to be checked once in every 5–6 years, or say 50,000 miles, it does not make much sense to concentrate much intellectual effort and spend project money on quick access. Thus, a lot of fasteners and connectors could be tolerated and the item may not be quickly accessible, but all of that has to be traded off against the cost and operational effectiveness of the system.
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