технічне обслуговування за нальотом
flying hours / logged flight hours
logged flight hours / flying hours
hours flown in combat
cryptanalyst 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
Watt hours (Wh) rating
man hours of duty
contingency maintenance / special maintenance
depot maintenance (beyond O and I level activities, performed in an industrial-type facility) / D-level maintenance
maintenance checks / routine maintenance, scheduled tasks
maintenance idling (periodic running of engine for maintenance purposes)
organizational maintenance (O-level) (day-to-day work that standard airfield maintenance groups perform in support of airfield operations)
routine maintenance / scheduled tasks, maintenance checks
scheduled tasks / routine maintenance, maintenance checks
special maintenance / contingency maintenance
in-flight maintenance
check flight maintenance
flight restriction zone / flight restricted zone (FRZ)
aircraft maintenance company (AMCO)
base maintenance
battalion maintenance platoon
communications and control systems maintenance
crew (preventive) maintenance
depot maintenance