Safety Logic Alert Responses

When the system generates an alert, the controller must immediately assess the situation visually and as presented on the ASDE system display, then take appropriate action as follows:

1. When an arrival aircraft (still airborne, prior to the landing threshold) activates a warning alert, the controller must issue go‐around instructions. (Exception: Alerts involving known formation flights, as they cross the landing threshold, may be disregarded if all other factors are acceptable.)
2. When an arrival aircraft activates a warning alert to a taxiway, the controller must issue go-around instructions.
3. When two arrival aircraft, or an arrival aircraft and a departing aircraft activate an alert, the controller will issue go-around instructions or take appropriate action to ensure intersecting runway separation is maintained.
4. For other safety logic system alerts, issue instructions/clearances based on good judgment and evaluation of the situation at hand.