межремонтный пробег(Time between overhaul (abbreviated as TBO or TBOH) is the manufacturer's recommended number of running hours or calender time before an aircraft engine or other component requires overhauling. WK Alexander Demidov)
ресурс до капитального ремонта(One important measure of an aircraft engine's overall economics is how often it has to be overhauled, the so-called time between overhaul, typically seen as TBO or TBOH. wiki Alexander Demidov)