airframe flying hours

flying hours / logged flight hours

logged flight hours / flying hours

total airframe flying hours

assigned life (of an aircraft in flying hours)

mean time between repairs (flying hours)

time to first overhaul (flying hours)

accident-free flying / mishap-free flying

mishap-free flying / accident-free flying

low flying aircraft / low-flying aircraft

airframe

hours flown in combat

cryptanalyst hours

airframe fatigue

fatigue test airframe

major airframe fatigue test

maintenance by flight hours

airframe and engine maintenance

airframe and engine technician

airframe and power plant technician

airframe failure

airframe hole

airframe repair / patch repair

engine logged hours

helicopter logged hours

patch repair / airframe repair

airframe and power plants

specialist areas (airframe and power plants; avionics; hydraulics; electrical systems)

airframe life

sack duty (hours, time)

in the hours of daylight

Watt hours (Wh) rating

man hours of duty