The normal lifetime of any system/sub-system developed for use in Aerospace & Military is of the order of 25-35 Years. During the entire lifetime of this system, maintenance support for the systems is of utmost importance. However, during the long lifetime of the systems, obsolescence issues of many kinds arise, which lead to problems in the support & maintenance of these systems. The obsolescence may be at the Component Level, Card/Sub-system level or at the system level. The obsolescence issue may arise due to the following reasons: |