What was found
TRAINING FLT 9101 - CLT-HKY-CLT - ON APPROACH INTO CLT WHEN THE LANDING GEAR WAS SELECTED DOWN, THE NOSE GEAR INTRANSIT LIGHT (RED) DID NOT EXTINGUISH AND THE NOSE GEAR DOWN LIGHT (GREEN) DID NOT ILLUMINATE. FOLLOWED THE CHECKLIST PROCEDURES, DECLARED AN EMERGENCY, AND DID A FLYBY OF THE TOWER FOR NLG POSITION. AN UNEVENTFUL LANDING WAS INTO CLT. THE CAPTAIN THEN NOTIFIED MAINTENANCE CONTROL OF THE PROBLEM. THE LANDING GEAR WAS PINNED AND THE AIRCRAFT WAS TAKEN TO HEAVY MAINTENANCE. THE PROBLEM WAS A FAULTY NLG DOWNLOCK SWITCH. REMOVED AND REPLACED SWITCH. OPS CHECK GOOD. (M)