This paper presents a model that helps engine management make cost saving decisions. The model is developed around airline-influenced factors that have an impact on engine Maintenance Repair & Overhaul (MRO): Operations, maintenance philosophy, contract type, and fleet age. Within the model a decision support tool is developed to analyze the impact of possible changes made to variables that influence engine MRO (engine thrust setting, shop visit schedule, and shop visit workscopes) on maintenance cost. The objective of the model is to support Engineering & Maintenance in defining a maintenance philosophy, which includes engine time on-wing and life limited parts management strategies. This maintenance philosophy will help with maintenance schedule optimization aiming at matching engine maintenance status to phase-out conditions at end of lease contracts, while at the same time reducing engine direct maintenance cost.
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