The Maintenance Repair and Overhaul (MRO) industry is unique because it carries out the production orientation function in order to maintain reliability according to the initial design, but also fulfills the service orientation function in the form of maintenance services to customers. With the development of aviation that is increasingly advanced, it also influences the management strategy of the MRO industry to be able to compete in the global world. Lean has been known as one of the most reliable business strategies in the MRO industry because it provides significant advantages in the supply chain to achieve competitiveness. A research review proves that more in-depth research and appropriate implementation analysis are needed to understand what competitive advantages will be gained in the context of applying lean to MRO supply chain management. The SCOR (Supply Chain Operations Reference) model is used as a media for designing performance measurement structures to find out the criteria that influence the implementation of lean supply chain management in MRO by considering the integration of production-oriented aspects and service-oriented activities. Then, the causal relationships between criteria need to be construct so that an ideal lean framework in the form of a management strategy that supports organizational functions can be developed in order to achieve successful implementation of Lean in the MRO supply chain.