special maintenance / contingency maintenance
спеціальне технічне обслуговування
спеціальне технічне обслуговування
operational contingency support
overseas contingency operations (OCO)
primary, alternate, contingency, emergency (PACE)
GOTWA five point contingency plan (Going, Others, Time, What, Actions)
maintenance checks / routine maintenance, scheduled tasks
maintenance idling (periodic running of engine for maintenance purposes)