Narrative:

Due to poor runway alignment I landed with the right main gear on an unplowed portion of the runway. This pulled the aircraft into the snow and off the runway resulting in damage to the right propeller. Distraction in the cockpit and a challenging environment were the 2 major factors that led to this incident. The flight departed cheyenne for laramie. Contact with center, AWOS and unicom were unclr to me (PIC) due to the difference in my and the copilot's radio switch position. I never did hear the reported visibility. We both had visual contact with the airport in visual condition at more than 10 mi from the airport. Having the airport in sight I was not overly concerned as to the visibility and concentrated my attention on other things. Due to lack of visual references and distrs on final approach, I did not align the aircraft with the runway as well as I could have. On short final, the copilot changed the intensity of the airport's lights at least 3 times. The last noticeable intensity of the lights before touchdown was less than maximum. The lesser and changing intensity of the runway lights created distraction in the critical phase of landing the aircraft. Though I could see the runway, as I flared I lost the lights. Position on the runway became unclr. The runway was covered with ice, a thin layer of snow and not plowed to full width. I did not see that part of the runway was unplowed. The unplowed portion near the aircraft was not visible due to the nose of the aircraft. Further down the runway, where I could see, it blended in with the surroundings. Poor runway alignment due to loss of visual references (whether due to distraction, illumination or both) I landed with the right main gear on an unplowed portion of the runway.

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Original NASA ASRS Text

Title: LOSS OF ACFT CTL WHEN A CPR BE30 SUPER KING AIR PLT ENCOUNTERS A SNOW BERM ON LNDG DURING A NIGHT OP AT LAR, WY.

Narrative: DUE TO POOR RWY ALIGNMENT I LANDED WITH THE R MAIN GEAR ON AN UNPLOWED PORTION OF THE RWY. THIS PULLED THE ACFT INTO THE SNOW AND OFF THE RWY RESULTING IN DAMAGE TO THE R PROP. DISTR IN THE COCKPIT AND A CHALLENGING ENVIRONMENT WERE THE 2 MAJOR FACTORS THAT LED TO THIS INCIDENT. THE FLT DEPARTED CHEYENNE FOR LARAMIE. CONTACT WITH CTR, AWOS AND UNICOM WERE UNCLR TO ME (PIC) DUE TO THE DIFFERENCE IN MY AND THE COPLT'S RADIO SWITCH POS. I NEVER DID HEAR THE RPTED VISIBILITY. WE BOTH HAD VISUAL CONTACT WITH THE ARPT IN VISUAL CONDITION AT MORE THAN 10 MI FROM THE ARPT. HAVING THE ARPT IN SIGHT I WAS NOT OVERLY CONCERNED AS TO THE VISIBILITY AND CONCENTRATED MY ATTN ON OTHER THINGS. DUE TO LACK OF VISUAL REFS AND DISTRS ON FINAL APCH, I DID NOT ALIGN THE ACFT WITH THE RWY AS WELL AS I COULD HAVE. ON SHORT FINAL, THE COPLT CHANGED THE INTENSITY OF THE ARPT'S LIGHTS AT LEAST 3 TIMES. THE LAST NOTICEABLE INTENSITY OF THE LIGHTS BEFORE TOUCHDOWN WAS LESS THAN MAX. THE LESSER AND CHANGING INTENSITY OF THE RWY LIGHTS CREATED DISTR IN THE CRITICAL PHASE OF LNDG THE ACFT. THOUGH I COULD SEE THE RWY, AS I FLARED I LOST THE LIGHTS. POS ON THE RWY BECAME UNCLR. THE RWY WAS COVERED WITH ICE, A THIN LAYER OF SNOW AND NOT PLOWED TO FULL WIDTH. I DID NOT SEE THAT PART OF THE RWY WAS UNPLOWED. THE UNPLOWED PORTION NEAR THE ACFT WAS NOT VISIBLE DUE TO THE NOSE OF THE ACFT. FURTHER DOWN THE RWY, WHERE I COULD SEE, IT BLENDED IN WITH THE SURROUNDINGS. POOR RWY ALIGNMENT DUE TO LOSS OF VISUAL REFS (WHETHER DUE TO DISTR, ILLUMINATION OR BOTH) I LANDED WITH THE R MAIN GEAR ON AN UNPLOWED PORTION OF THE 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.