As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLT/SOP - FLT 5089 - ON TAKEOFF FROM CLT, THE RT MAIN GEAR UNSAFE LIGHT CAME ON. THEN THE LIGHT WOULD GO OUT THEN BACK ON. AIRCRAFT RETURNED TO CHARLOTTE. NO EMERGENCY WAS DECLARED. AIRCRAFT MADE A SAFE LANDING WITH NO OTHER PROBLEMS. MAINTENANCE FOUND THE JAM NUT ON THE UPLOCK SWITCH LOOSE. RE-TORQUED THE UPLOCK SWITCH, SYSTEM OPS CHECKED GOOD. (X)