What was found
(CAN) DURING APPROACH WHEN THE FLAPS WERE SELECTED TO UNIT 1 THE FLIGHT CREW NOTICED THE FLAP INDICATOR DID NOT MOVE AND REMAINED IN THE FLAPS UP POSITION. THE APPROPRIATE CHECKLIST WAS CARRIED OUT AND THE ACFT MADE A SUCCESSFUL LANDING. MAINTENANCE CARRIED OUT THE FOLLOWING TASKS AND ACTIONS, FIM 27-51, TASK 840, FSEU BITE CARRIED OUT WITH MAINTENANCE MESSAGE FLAP 4, SKEW 27-53253. MAINTENANCE INSPECTED THE NR 4 SKEW SENSOR AND FOUND CORROSION INSIDE CONNECTOR, D11820. THE NR 4 SKEW SENSOR AND CONNECTOR WERE SUBSEQUENTLY CLEANED AND TESTED SERVICEABLE IAW SWPM 20-60-01. THE ACFT WAS THEN RETURNED TO SERVICE. AN OPEN DEFECT REPORT WAS RAISED TO HAVE THE CONNECTOR AND SKEW SENSOR UNIT REPLACED AT THE NEXT MAINTENANCE OPPORTUNITY.