Maintenance schedule for facilities and equipment should be implemented. Regular equipment maintenance prevents equipment breakdowns, which can be costly. It also reduces the risk of product contamination and maintains the ‘validated state’ of the facility or equipment. Written procedures should be implemented for all scheduled and emergency maintenance. These should detail who does the work, the tasks involved, and define any lubricants, coolants, cleaning agents, etc., required. It is also a GMP requirement to have a maintenance schedule in place with the frequency determined by the criticality of the equipment.