Preventive maintenance of medical equipment is the regular inspection and servicing of medical equipment to ensure that they are in good condition and can perform their intended function correctly. This type of maintenance is designed to prevent equipment failures and breakdowns, which can lead to delays in and create dangerous situations for patient care. 

Preventive maintenance also helps extend the life of medical equipment, saving money and resources in the long run. Typically, the preventive maintenance is performed by trained medical engineers, who have the knowledge and expertise to identify and correct potential problems with the equipment.