AAOM Handbook

SC.13 Are Changes to the Routine Operating Schedule Approved Context The draft schedule must deliver the completion of every Task so that each Work Order is completed prior to its Required Date, regardless of any apparent constraint from workplace or resource availability. While every effort has been made to optimise the draft schedule, and to remove constraints on its completion, there may still be critical issues that will prevent the schedule being completed unless they are managed. There are three basic types of critical issues;  A resource (material, service or specialised tool/equipment) that is necessary for the completion of the schedule cannot be made available at the Scheduled Date.  The schedule cannot be completed without changes being made to the Routine Operating Schedule (ROS).  The schedule cannot be completed without changes being made to the labour available for executing it. The ROS is developed from the approved Operating Master Schedule (OMS). The approved OMS represents an integrated schedule of Production and Service work that has been modelled to confirm that, if it is followed, the Performance Targets and confidence levels can be met. That is, the closer the actual schedule for execution of Production and Service work fits to the approved OMS and ROS, the more likely that the Performance Targets and confidence levels will be delivered. All real processes exhibit variation and hence it is inevitable that as the actual Production and Service work execution schedule is developed there will be potential deviations from the approved ROS. However, any deviations from the approved ROS should be minimised and, when deviations are necessary, operations should be brought back in line with the approved ROS as quickly as possible. Purpose To decide whether a change to the ROS, required for execution of the draft schedule, will be approved. Quantity One decision on the ROS that will be applied to the Schedule construction. For a ROS that represents the operating pattern for an area, the;  number,  start time, and  duration of operating/down times that will be available for assignment in the schedule.