Machine Availability Machine Availability Run Time Available Time Available Time - Downtime Time Available Time Example: A shop works 8 hours a day, 5 days a week. A machines availability is known to be 80% on a daily basis if preventive maintenance is not performed. (a) If preventive maintenance is done on this machine for 10 minutes each day, it is expected that the machine will be available for 90% of the remaining time each day. (b) If preventive maintenance is done on this machine for 15 minutes each day, it is expected that the machine will be available for 95% of the remaining time each day. Is it worth doing preventive maintenance on this machine for (a) 10 mins or (b) 15 mins