heavy maintenance/repair
капітальний ремонт
капітальний ремонт
airframe repair / patch repair
patch repair / airframe repair
maintenance and repair equipment
maintenance, repair and operation (MRO)
maintenance, repair and overhaul (MRO)
automatic heavy barrel rifle / heavy barrel automatic rifle
heavy-armored (heavy armoured)
contingency maintenance / special maintenance
maintenance checks / routine maintenance, scheduled tasks
maintenance idling (periodic running of engine for maintenance purposes)