SMA UNCTLABLY DEPARTS RWY AT FVE.

Narrative

AT THE OUTSET OF AN UNEVENTFUL 3 HR IFR/VMC FLT FROM IAD; I ACQUIRED THE FVE ARPT VISUALLY APPROX 15 MI OUT AND CANCELED IFR TO SWITCH TO UNICOM. I CONTINUED ON THE GPS RWY 32 APCH PATH TO GET ESTABLISHED ON A 10 MI FINAL. LAST ASOS WAS: 'WIND 340 DEGS; 18 KTS GUSTING TO 30 KTS; FEW 3500 FT; CEILING 4300 FT BROKEN; -16 DEGS/-24 DEGS; ALTIMETER 29.61 INCHES.' APCH WAS CONDUCTED WITH 20 DEG FLAPS AND SLIGHTLY HIGHER THAN NORMAL APCH SPD (95 KIAS) ON ACCOUNT OF THE LIGHT TURB AND GUSTS. TOUCHDOWN WAS SMOOTH IN A R XWIND. A SECOND OR TWO AFTER NOSEWHEEL TOUCHDOWN; THE AIRPLANE STARTED WXVANING TO THE R. I TRIED TO CORRECT WITH RUDDER AND AILERONS TO NO AVAIL AS R WHEEL WAS ON SNOWY PORTION OF RWY (WITH FRICTION) AND L WHEEL WAS ON WHAT APPEARED TO BE DRY PAVEMENT BUT TURNED OUT TO BE ICE. THE AIRPLANE EXITED THE SIDE OF THE RWY ONTO A SNOWY SURFACE (MISSING RWY LIGHTS) AND STOPPED IN APPROX 300 FT. VISIBLE DAMAGE: BENT PROP AS IT HIT A LOW SNOW DRAFT; AND DAMAGED MAIN LNDG GEAR DOORS DUE TO PLOWING THROUGH SNOW. AIRPLANE STOPPED 150 DEGS FROM THE DIRECTION OF LNDG. NO INJURIES OR VISIBLE STRUCTURAL AIRFRAME DAMAGE. COMBINATION OF WIND GUST FROM THE R AFTER TOUCHDOWN; ICE ON THE CTR PORTION OF THE RWY AND SNOW ON THE SIDE WERE INSTRUMENTAL IN THIS LOSS OF CTL INCIDENT.