в исправном состоянии(in good condition, or in good enough condition to be used: "Business owners are being urged to check that their CCTV cameras are in working order. CBED Alexander Demidov)
содержать в исправном состоянии(keep the equipment / smoke detectors in working order • Walking canes are fairly maintenance-free devices, with little extra care necessary to keep them in working order. -- поддерживать в рабочем / исправном состоянииART Vancouver)
поддерживать в рабочем состоянии(keep the equipment in working order • keep smoke detectors in working order • Walking canes are fairly maintenance-free devices, with little extra care necessary to keep them in working order. -- поддерживать в рабочем / исправном состоянииART Vancouver)