безвідмовність
mean time between failures (MTBF) (logistics)
mean time between failures requiring overhaul
mean time between significant failures
consequential failures
failures and malfunctions
involuntary absence without leave
leave (of absence)
sick absence
unauthorized absence (UA)
absence
absence over leave
absence without leave (AWL)
absence оп duty
administrative absence
authorized absence
absence pursuant to a pass
absence without official leave (AWOL)