平へい均きん修しゅう復ふく時じ間かんMeaningsNoun1. mean time to repair; MTTRKanji used平flat均equalize修discipline (of study)復return to normal時time間intervalComposed of平へい均きんaverage; mean; balance; equilibriumNoun修しゅう復ふくrestoration; repair; mendingNoun時じ間かんtime; hour; period; class; lessonNoun