repair

Maintenance, repair and operations (MRO) or maintenance, repair, and overhaul involves fixing any sort of mechanical, plumbing or electrical device should it become out of order or broken (known as repair, unscheduled, or casualty maintenance). It also includes performing routine actions which keep the device in working order (known as scheduled maintenance) or prevent trouble from arising (preventive maintenance). MRO may be defined as, "All actions which have the objective of retaining or restoring an item in or to a state in which it can perform its required function. The actions include the combination of all technical and corresponding administrative, managerial, and supervision actions."

Die Instandhaltung (engl. maintenance, repair and overhaul oder kurz MRO) von technischen Systemen, Bauelementen, Geräten und Betriebsmitteln soll sicherstellen, dass der funktionsfähige Zustand erhalten bleibt oder bei Ausfall wiederhergestellt wird.

Selon la définition de l'AFNOR, la maintenance vise à maintenir ou à rétablir un bien dans un état spécifié afin que celui-ci soit en mesure d'assurer un service déterminé.