IFATCA Policy is:

ATCOs shall not provide both surveillance approach service and aerodrome control service simultaneously.

ATCOs required to provide a surveillance approach service and a surveillance area service simultaneously should be strongly discouraged by MAs.

When ATCOs are required to exercise more than one rating during their operational shift, the procedure shall undergo a safety risk assessment with consideration of:

• The human performance of the ATCO, specifically the risk of mode-switching errors;
• Fatigue risk management;
• The ability to maintain sufficient controller competency.