time to first overhaul (flying hours)

flying hours / logged flight hours

logged flight hours / flying hours

mean time between repairs (flying hours)

time to first overhaul

time to first overhaul in temperate climate

time to first overhaul in tropical climate

airframe flying hours

assigned life (of an aircraft in flying hours)

total airframe flying hours

sack duty (hours, time)

first fire mixture / first-fire mixture

mean time between failures requiring overhaul

accident-free flying / mishap-free flying

mishap-free flying / accident-free flying

low flying aircraft / low-flying aircraft

noncombat flying time

nonoperational flying time

Total time spent flying

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

maintenance, repair and overhaul (MRO)

major overhaul (repair)

overhaul

aircraft requiring overhaul

failure requiring overhaul

achieved overhaul life