As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLT/HKY - FLT 5092 - ON APPROACH TO HKY, THE PILOT'S ARTIFICIAL HORIZON WENT BLANK. DUE TO HEAVY RAIN, PILOT HAD TO ABORT APPROACH TO HKY. AIRCRAFT RETURNED TO CLT. MAINTENANCE REMOVED AND REPLACED THE NR 1 DG. SYSTEM OPS CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE. (X)