Group of companies «Drilling Solutions» introduces the new standards into the preventive maintenance system. Today, the preventive maintenance is the simplest and at the same time reliable method of works. Operation of the equipment applied in RC drilling is resumed, when the units worked out the specific number of hours and the new working cycle is coming. Thus, the normal maintenance volume is clearly marked – by determining the optimum maintenance periods. Such model allows to minimize the downtime risks and provide the further full operation of units.