WITH GEAR DOWN AND LOCKED; AN MD80 FLT CREW PERFORMS A GAR DURING A VISUAL APCH TO RWY 25L AFTER RECEIVING AN AURAL LNDG GEAR WARNING WHEN EXTENDING FLAPS PAST 15 DEGS AT LAS; NV.

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I WAS FLYING THE VISUAL APCH TO RWY 25L AT LAS. NORMAL APCH. SLOWED TO 175 KTS WITH FLAPS 15 DEGS. AT RELIN; CALLED FOR GEAR DOWN. GEAR EXTENDED. 3 GREEN LIGHTS; THE AMBER GEAR DOOR OPEN LIGHT EXTINGUISHED. FLAPS 28 DEGS WAS CALLED FOR AND SELECTED. AURAL 'LNDG GEAR' WARNING SOUNDED IMMEDIATELY. GEAR LIGHTS REMAINED IN THE PROPER CONFIGN -- 3 GREEN; NO RED; NO AMBER. GAR WAS EXECUTED. CHKED ALT SAFETY WITH ATC; CHKED QRH FOR PROC (NONE FOUND); CALLED LAS MAINT; AND DECLARED AN EMER. ON DOWNWIND; GEAR WAS AGAIN EXTENDED. POS OF MAIN GEAR WAS CONFIRMED DOWN WITH PERISCOPE; AND NOSE GEAR WITH NOSE LNDG GEAR INDICATOR. ACFT WAS SLOWED AND FLAPS WERE EXTENDED TO RWY 28. 'LNDG GEAR' AURAL WARNING SOUNDED. FLAPS WERE PLACED TO 40 DEGS. AURAL WARNING CONTINUED. FLAPS WERE THEN RETRACTED TO 15 DEGS. AURAL WARNING WAS SILENCED. ACFT WAS FLOWN IN THIS CONFIGN UNTIL FINAL FOR RWY 25R. THIS TIME WHEN FLAPS WERE PLACED TO RWY 28 THERE WAS NO AURAL WARNING. CAPT MADE THE LNDG ON RWY 25R. LNDG WAS NORMAL.