engine logged hours

flying hours / logged flight hours

logged flight hours / flying hours

helicopter logged hours

engine capacity / engine power, engine output

hours flown in combat

cryptanalyst hours

maintenance by flight hours

airframe flying hours

assigned life (of an aircraft in flying hours)

mean time between repairs (flying hours)

time to first overhaul (flying hours)

total airframe flying hours

sack duty (hours, time)

in the hours of daylight

Watt hours (Wh) rating

man hours of duty

reaction engine / motor (jet engine)

rotary engine (Wankel engine)

engine ground run / engine test

engine oil reservoir / engine oil tank

air-breathing jet engine

axial-flow (jet) engine

axial-flow turboshaft engine

compression ignition engine

cylinder block (engine block)

diesel engine

engine

engine kill

engine pack

engine room

engine thrust

explosion engine