Watt hours (Wh) rating

flying hours / logged flight hours

logged flight hours / flying hours

ingress protection rating (IP Rating)

watt-meter

hours flown in combat

cryptanalyst hours

maintenance by flight hours

airframe flying hours

assigned life (of an aircraft in flying hours)

engine logged hours

helicopter logged 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

man hours of duty

high-knock rating gasoline

high-octane rating

idle rating

maximum continuous rating

octane rating

takeoff rating

noise annoyance rating system

thrust-to-weight rating

job classification performance rating

job performance rating

efficiency rating

skilled rating

aeronautical rating

performance rating

readiness rating