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MTBUR abbr. stresses
avia.	среднее время работы между неплановыми ремонтами
oil	средняя наработка между внеплановыми заменами (mean time between unscheduled removals)
English thesaurus
MTBUR abbr.
abbr., avia.	mean time between unscheduled repair and removals; mean time between unit replacement; mean time between unsatisfactory reports
abbr., oil	mean time between unscheduled removal
comp.	mean time between unsheduled repairs
tech.	mean time between unscheduled removals