Maintenance, Repair and Overhaul
|An organization that maintains or restores an item in or to a state in which it can perform its required function.
NOTE: MRO often refers to civil aviation maintenance and Depot Level Maintenance often refers to military vehicle maintenance.
Source: SAE Aerospace Standard AS5553 Rev. C Counterfeit Electrical, Electronic, and Electromechanical (EEE) Parts; Avoidance, Detection, Mitigation, and Disposition