What was found
SHIP 9569 -GEAR/DE- THE CREW NOTED THE "GEAR DOOR OPEN" MESSAGE AFTER THE LANDING GEAR WAS EXTENDED ON APPROACH INTO CLT. THEY UTILIZED THE ALTERNATE GEAR EXTENSION METHOD AND DECLARED AN EMERGENCY WITH ATC. THE LANDING WAS UNEVENTFUL EXCEPT FOR THE MAIN LANDING GEAR DOORS REMAINING IN THE DOWN POSITION AND TOUCHING UPON LANDING. THE AIRCRAFT WAS TOWED TO THE GATE. CORRECTIVE ACTION: MAINTENANCE FOUND THE LEFT MAIN LANDING GEAR DOOR ACTUATING CYLINDER WAS BYPASSING INTERNALLY. THE CYLINDER WAS REPLACED AND RIGGED. ALSO, THE GEAR DOOR BUMPERS WERE REPLACED. OPERATIONAL CHECKS WERE GOOD AND THE AIRCRAFT HAS RETURNED TO SERVICE. (LP #9514404)