In order to improve the safety and reduce plant shut down time forscheduled maintenance works, Aceralia is developing and testing onits HSM at Aviles an application that ensures that the selected equipmentis correctly and safely powered down. This application also servesupdated information regarding the current status of maintenanceworks and equipment. Finally, it performs automatic analysis of theevents happened during the shut down, deviations with respect tothe scheduling and other statistical analyses.