What was found
WHILE ON APPROACH, THE FLIGHT CREW SELECTED LG INTO THE DOWN POSITION. ONCE SELECTED, THE MAIN GEAR INDICATORS SHOWED DOWN & LOCKED WHILE THE NOSE GEAR INDICATOR WAS NOT ILLUMINATED. THE GEAR UNSAFE IN-TRANSIT LIGHT WAS ALSO EXTINGUISHED. A FLY-BY OF THE TOWER WAS PERFORMED TO VERIFY IF THE NOSE GEAR WAS EXTENDED. A VISUAL CONFIRMATION WAS GIVEN THAT THE GEAR APPEARED TO BE DOWN. AN EMERGENCY WAS DECLARED & THE FLIGHT CREW PERFORMED THE EMERGENCY CHECK LIST, THE LG ALTERNATE SYS, BLOW-DOWN BOTTLE, WAS DEPLOYED. AN UNEVENTFUL LANDING WAS ACCOMPLISHED WITH NO FURTHER ISSUES. TROUBLESHOOTING OF THE SYS INDICATED A FAULTY NLG DOWN LOCK SWITCH, REPLACED THE SWITCH.