A RTSA message relates to the execution phase. It addresses an evaluation process performed at a specific time triggered by a specific event concerning the ARES status (activation, de-activation, modification) to match the existing plan (AUP / UUP) to the actual life performance. Identified delta will initiate a new plan. In addition it also addresses any change to existing plans (AUP / UUP) prior to their execution in real time, triggered by an event on the day of operation.