SAFETY LOGIC SYSTEM ALERTS


  1. ALERT- An actual situation involving two real safety logic tracks (aircraft/aircraft, aircraft/vehicle, or aircraft/other tangible object) that safety logic has predicted will result in an imminent collision, based upon the current set of Safety Logic parameters.
  2. FALSE ALERT-
    1. Alerts generated by one or more false surface-radar targets that the system has interpreted as real tracks and placed into safety logic.
    2. Alerts in which the safety logic software did not perform correctly, based upon the design specifications and the current set of Safety Logic parameters.
    3. The alert is generated by surface radar targets caused by moderate or greater precipitation.
  3. NUISANCE ALERT- An alert in which one or more of the following is true:
    1. The alert is generated by a known situation that is not considered an unsafe operation, such as LAHSO or other approved operations.
    2. The alert is generated by inaccurate secondary radar data received by the Safety Logic System.
    3. One or more of the aircraft involved in the alert is not intending to use a runway (for example, helicopter, pipeline patrol, non-Mode C overflight, etc.).
  4. VALID NON-ALERT- A situation in which the safety logic software correctly determines that an alert is not required, based upon the design specifications and the current set of Safety Logic parameters.
  5. INVALID NON-ALERT- A situation in which the safety logic software did not issue an alert when an alert was required, based upon the design specifications.

Source: PCG