What was found
AIRCRAFT WAS GROUNDED: DURING FINAL APPROACH PRIOR TO GEAR EXTENSION, THE GEAR UNSAFE LIGHTS FLICKER FOR ABOUT 10 SECONDS WITH THE HORN. A BURNING SMELL ACCOMPANIED THE FLICKERING. REPLACED LOW RANGE RADIO ALTIMETER ANTENNA NR 2 AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK, PER AMM 34-33-11. THE BURNING WAS DETERMINED TO BE RELATED TO INCORRECT LAMPS BEING INSTALLED (327 BULB OPPOSED TO 387 BULBS) ON THE LANDING GEAR UNSAFE ANNUNCIATOR PANEL WHICH WERE REPLACED WITH THE CORRECT LAMPS, PER AMM 33-11-00 AND IPC 32-61-00-06. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED WITH NO SMELL BEING NOTED, (AALA202009149007).