What was found
ON APPROACH TO RUNWAY 27 KMEM, WHEN LANDING GEAR SELECTED DOWN, THE LEFT GEAR DOWN GREEN LIGHT DID NOT ILLUMINATE. DECLARED AN EMERGENCY WITH KMEM ATC, MADE LOW PASS TO ALLOW TOWER TO VISUALLY VERIFY ALL GEAR NORMAL. NORMAL LANDING AFTER VERIFYING GEAR DOWN WITH TOWER. UPON CREW DEBRIEF FOUND THAT THE LT GEAR DOWN SWITCH LIGHT WAS BURNED OUT AND WOULD NOT TEST. RELAMPED LT GEAR DOWN LOCKED LIGHT IAW AMM 33-13-00-2. LIGHT ILLUMINATED AND OPS CHECKED GOOD. AS PRECAUTION VISUALLY INSPECTED DOWN LOCK SENSORS ON MAIN AND NOSE GEAR, ALSO PERFORMED BITE TEST OF PSEU AND FOUND NO DISCREPANCIES IAW FIM 32-09 FT804 FIG 103. A/C HAS NO 30 DAY HISTORY AND IS OK TO CONTINUE SERVICE AT THIS TIME.