As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 1580 - GSO - THE LANDING GEAR WOULD NOT RETRACT AFTER TAKEOFF FROM GSO. THE AIRCRAFT WAS RETURNED TO GSO WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE AIR/GROUND PROXIMITY SENSOR AT FAULT. THE SENSOR WAS REPLACED AND GEAR RETRACTION WAS NORMAL. OTHER GROUND SENSE FUNCTIONS ALSO CHECKED GOOD. (M)