mean time between repairs (flying hours)

mean time between repairs in temperate climate

mean time between repairs in tropical climate

flying hours / logged flight hours

logged flight hours / flying hours

mean time between critical failure (MTBCF)

mean time between failures (MTBF) (logistics)

mean time between failures requiring overhaul

mean time between significant failures

time to first overhaul (flying hours)

airframe flying hours

assigned life (of an aircraft in flying hours)

total airframe flying hours

sack duty (hours, time)

generalist areas (phased maintenance; basic repairs; accountability; quality assurance basis)

accident-free flying / mishap-free flying

mishap-free flying / accident-free flying

low flying aircraft / low-flying aircraft

Greenwich Mean Time (GMT)

mean down time (MDT) (logistics)

mean and sidereal time interval

Greenwich mean time

noncombat flying time

nonoperational flying time

hours flown in combat

cryptanalyst hours

maintenance by flight hours

engine logged hours

helicopter logged hours

in the hours of daylight

Watt hours (Wh) rating

man hours of duty

clearance between barrel and forearm