Target setting for the departments in an aircraft repairable item system

In this paper a repairable item system for the maintenance support of a fleet of aircraft is introduced. The purpose of the system, a complex conjunction of repair departments and stock locations, is the repair and supply of serviceable engines to the maintenance process of the aircraft. The performance of the repairable item system is measured by a service level. If the realized service level corresponds with the required service level, conditions are created among which the maintenance process can be carried out efficiently. Thus the setting of service levels is a means for the control of the repairable item system. To meet the required service level target for the entire repairable item system, it is important that the performance of the individual repair departments and the stock locations of the repairable item system are tuned. In this coordination process, service level targets must also be set for the repair departments and stock locations. In this paper it is shown that the deduction of these service level targets can be supported with the help of well-known models such as METRIC and MOD-METRIC. In a numerical analysis it is shown that the targets for the repair departments can be substantially lower than the targets for the downstream stock locations of the repairable item system.