Safety logic system alerts

{
  "id": "MLC-T-AVN-000861",
  "term": "Safety logic system alerts",
  "field": "Aviation and air traffic control",
  "definition": "a. ALERT-\n\nb. An actual situation involving two real Safety Logic tracks (aircraft/aircraft, aircraft/vehicle, or aircraft/other tangible object) that the Safety Logic System has predicted will result in an imminent collision, based upon the Safety Logic parameters.\n\nc. An actual situation involving a single Safety Logic track arriving to, or departing from, a closed runway.\n\nd. An actual situation involving a single Safety Logic track arriving to a taxiway.\n\ne. FALSE ALERT-\n\nf. Alerts generated by one or more false surface radar or cooperative surveillance targets, that the ASDE system has interpreted as real tracks and placed into Safety Logic.\n\ng. Alerts in which the Safety Logic System did not perform correctly, based upon the design specifications and Safety Logic parameters.\n\nh. Alerts generated by surface radar targets caused by moderate or greater precipitation.\n\ni. NUISANCE ALERT- An alert in which one or more of the following is true:\n\nj. The alert is generated by a known situation that is not considered an unsafe operation, such as LAHSO or other approved operations.\n\nk. The alert is generated by inaccurate cooperative surveillance data received by the Safety Logic System.\n\nl. One or more of the aircraft involved in the alert is not intending to use a runway/taxiway (helicopter, pipeline patrol, non-Mode C overflight, etc.).\n\nm. VALID NON-ALERT- A situation in which the Safety Logic System correctly determines that an alert is not required, based upon the design specifications and Safety Logic parameters.\n\nn. I NVALID NON-ALERT- A situation in which the Safety Logic System did not issue an alert when an alert was required, based upon the design specifications and Safety Logic parameters.",
  "references": [
    "FAA Pilot/Controller Glossary"
  ],
  "url": "https://mlchart.com/terminology/aviation/safety-logic-system-alerts/"
}