What was found
ON TAKEOFF OUT OF ONT, THE FLT CREW OBSERVED A LANDING GEAR DOOR UNSAFE INDICATION AFTER GEAR RETRACTION. THE LANDING GEAR WAS CYCLED, AND THE WARNING LIGHT EXTINGUISHED. TOL MAINTENANCE INSPECTED THE LANDING GEAR DOOR WARNING SYSTEM AND FOUND THE ELECTRICAL CONNECTOR ON THE RIGHT DOOR UPLATCH SWITCH LOOSE. THE CONNECTOR WAS SECURED AND THE INDICATION SYSTEM OPS CHECKED. THE AIRCRAFT WAS RETURNED TO SERVICE. (M)