There was no specific work environment or production process. Maintenance target is breakdown 3 times and 240 hour repair. Maintenance plan is prepared yearly include all machine,car,crane and orklift. Machine has both 6 months plan and daily plan.Transformer is checked by service outside.Trucks are checked daily and weekly. Cranes are checked by qualified engineer.Machine history show history of machine. PM plan(FM-SS-22) shows maintenance plan for each machine.FM-SS-23 is used for recording daily PM result.The result for machine 1024,1220,1433 and 1222 are reviewed.IT is controlled by outsource IT in office in Bangkok with back up and virus scan.