This paper discusses the challenges of maintenance, repair, and overhaul (MRO) as fall into two main categories ? operations-based and production-based. Organizations that own and operate expensive repairable or routable assets as part of their revenue generation must deal with operations-based MRO issues. Operations-based MRO ? found in sectors such as aerospace, commercial airline, military, transportation, automotive and telecommunications ? is practiced on a direct revenue generating or mission execution asset such as an aircraft or a ship.