Narrative:

We contacted boise FSS at approximately XD25 local, we received an updated WX briefing including NOTAMS for our flight from twin falls, identification, to weiser, identification. There were no NOTAMS issued for weiser airport. At approximately XD40 local, we departed twin falls, identification, on an instrument flight plan to ontario, or (closest airport with an instrument approach). After descending through 10000 ft MSL we found ourselves, as expected, in VFR conditions. Our observations of the current WX at the time were 10000 ft overcast with visibility of 35+ mi. This was confirmed by visual sighting of both the ontario, or, and weiser, identification, airport beacons. GPS distance at this time was 25 mi to weiser, identification (S87). Surface winds at S87 were calm. We canceled our IFR flight plan and made our descent for the approach to S87. After our descent, we activated pilot controled lighting (airport lighting) overflew the airport, and made left traffic to runway 30. The runway, to our observation from the air, appeared clear, lighting was operative, with snow on the runway. After a normal approach, flare and touchdown, we slowed the aircraft using reverse thrust. At approximately 50 KTS, the left main landing gear struck an offset berm near the centerline of the runway left by the snowplow, the operator never completed the plowing of the runway. The aircraft turned unctlably 90 degrees back to the right paralleling runway 30 about 30 ft south of the runway. The aircraft, according to police reports and measurements, exited the runway and slid about 110 ft. There was no fire and no apparent injuries. There were no passenger on board. This was a part 91 pleasure flight. Cause of incident was improperly plowed runway.

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Original NASA ASRS Text

Title: KING AIR PLT SUSTAINS LOSS OF CTL AND ACFT DAMAGE AFTER CONTACTING OFFSET BERM OF SNOW LEFT BY SNOW PLOW AT S87, ID.

Narrative: WE CONTACTED BOISE FSS AT APPROX XD25 LCL, WE RECEIVED AN UPDATED WX BRIEFING INCLUDING NOTAMS FOR OUR FLT FROM TWIN FALLS, ID, TO WEISER, ID. THERE WERE NO NOTAMS ISSUED FOR WEISER ARPT. AT APPROX XD40 LCL, WE DEPARTED TWIN FALLS, ID, ON AN INST FLT PLAN TO ONTARIO, OR (CLOSEST ARPT WITH AN INST APCH). AFTER DSNDING THROUGH 10000 FT MSL WE FOUND OURSELVES, AS EXPECTED, IN VFR CONDITIONS. OUR OBSERVATIONS OF THE CURRENT WX AT THE TIME WERE 10000 FT OVCST WITH VISIBILITY OF 35+ MI. THIS WAS CONFIRMED BY VISUAL SIGHTING OF BOTH THE ONTARIO, OR, AND WEISER, ID, ARPT BEACONS. GPS DISTANCE AT THIS TIME WAS 25 MI TO WEISER, ID (S87). SURFACE WINDS AT S87 WERE CALM. WE CANCELED OUR IFR FLT PLAN AND MADE OUR DSCNT FOR THE APCH TO S87. AFTER OUR DSCNT, WE ACTIVATED PLT CTLED LIGHTING (ARPT LIGHTING) OVERFLEW THE ARPT, AND MADE L TFC TO RWY 30. THE RWY, TO OUR OBSERVATION FROM THE AIR, APPEARED CLR, LIGHTING WAS OPERATIVE, WITH SNOW ON THE RWY. AFTER A NORMAL APCH, FLARE AND TOUCHDOWN, WE SLOWED THE ACFT USING REVERSE THRUST. AT APPROX 50 KTS, THE L MAIN LNDG GEAR STRUCK AN OFFSET BERM NEAR THE CTRLINE OF THE RWY LEFT BY THE SNOWPLOW, THE OPERATOR NEVER COMPLETED THE PLOWING OF THE RWY. THE ACFT TURNED UNCTLABLY 90 DEGS BACK TO THE R PARALLELING RWY 30 ABOUT 30 FT S OF THE RWY. THE ACFT, ACCORDING TO POLICE RPTS AND MEASUREMENTS, EXITED THE RWY AND SLID ABOUT 110 FT. THERE WAS NO FIRE AND NO APPARENT INJURIES. THERE WERE NO PAX ON BOARD. THIS WAS A PART 91 PLEASURE FLT. CAUSE OF INCIDENT WAS IMPROPERLY PLOWED RWY.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.