GA MOONEY M20 PLT LANDS AT GWS WITH GEAR UP.

Narrative

ON JUL/XA/99; I LANDED MY ACFT WITH THE WHEELS NOT EXTENDED. THERE WERE SEVERAL ULTRALIGHT ACFT IN THE AREA; BUT NO VISUAL CONTACT MADE. THERE WAS A LIGHT TAILWIND FOR LNDG AT GLENWOOD SPRINGS. THIS IS A 1-WAY ARPT IN LIGHT WIND CONDITIONS. THERE ARE MOUNTAINS VERY CLOSE; ALL AROUND THE ARPT. THE MOUNTAINS AND WINDS DO CAUSE SOME TURB AT THIS ARPT. ON DOWNWIND; THE ACFT IS VERY CLOSE TO THESE MOUNTAINS AND REQUIRES CONSTANT CONCERN. ON DOWNWIND MY AIRSPD SEEMED TO BE NORMAL AT 90 MPH AND A 500 FPM DSCNT WAS EASILY ACHIEVED. WITH A HEADWIND ON DOWNWIND; THE SPD AND DSCNT SEEMED NORMAL; THEREFORE I DIDN'T EXTEND THE GEAR AT MY USUAL TIME. THE TURNS TO BASE AND FINAL ALSO SEEMED NORMAL AS DID THE DSCNT AND SPDS. I USUALLY CARRY 10 MPH OVER (90 MPH) ON FINAL IN TAILWINDS. THIS MADE THE APCH ALL SEEM NORMAL. I WEAR ACTIVE NOISE CANCELING HEADPHONES AND DIDN'T HEAR THE GEAR UP WARNING. AS A RESULT; I DID LAND THE ACFT ON THE BELLY AND ON THE CTRLINE OF THE RWY. THE LNDG WAS A FULL STALL LNDG AND THEREFORE THERE WAS NO CHANCE FOR A GAR AS IT HAPPENED SUDDENLY. FORTUNATELY THERE WERE NO INJURIES OR POST LNDG FIRE. THIS IS CONSIDERED AN INCIDENT BY FAA FSDO SALT LAKE CITY. DAMAGE WAS MINOR.