crew (preventive) maintenance
(профілактичне) ТО силами розрахунку / екіпажу
(профілактичне) ТО силами розрахунку / екіпажу
preventive maintenance checks and services (PMCS)
preventive-maintenance overhaul
contingency maintenance / special maintenance
maintenance checks / routine maintenance, scheduled tasks
maintenance idling (periodic running of engine for maintenance purposes)
routine maintenance / scheduled tasks, maintenance checks