When an aircraft encounters a defect, the aircraft maintenance team initiates a thorough defect investigation to pinpoint the specific component, group of components, or aircraft system responsible for the issue. In most cases, rectifying the defect involves adopting a "repair by replacement" approach, where the faulty component or components are substituted.

This approach results in a substantial volume of component removals and installations as part of the defect rectification process across the fleet. Managing and monitoring these frequent changes in components becomes complicated, particularly considering that these replacements take place at diverse locations within an airline's operational network.

Given this complexity, establishing a foolproof system is vital to track the developing configuration of each aircraft. Significantly, the system ensures that accurate components are utilized as replacements for the removed ones. This meticulous process is integral to the effective management of airworthiness within the entire aircraft fleet.