The U.S. Air Force is starting operational development of an automatic ground collision avoidance system (Auto-GCAS) that potentially could save many front-line combat aircraft. The system uses precise navigation, performance and digital terrain data to monitor the aircraft's position relative to known obstacles. Auto-GCAS is designed to intervene as a last resort when it senses that a ground collision is imminent. Just as importantly, evalua-tors say exhaustive flight tests prove the system is extremely resistant to false alarms or "nuisance" fly-ups, and will not interfere with even the most extreme combat missions.
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