What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
N145SL was on approach to runway 34R at kslc. The breaking action from aircraft landing in front of N145SL was "good" to "fair." N145SL touched down on centerline when the pilot flying (captain) asked for "props forward." The pilot-not-flying pushed the props forward at which time the aircraft started to drift towards the left. The pilot tried to bring the aircraft back towards center but was not able. The center of the runway was clear. According to the pilots the runway had some patches of snow and slush and towards the edge of the runway there was "unplowed shoulders with several inches of snow." Once the aircraft entered the snow the aircraft went off the side of the runway. From the time the aircraft skid 1320 feet until the time the aircraft came to rest between taxiways H7 and H8. The aircraft also was turned approximately 150 degrees towards the left from runway heading. The damage to the aircraft was minor. Out of the 10 blades one will most likely not be able to be blended or filed. The only other damage was to the underside of the left ventricle. No other damage was found.
As the FAA filed it
N145SL WAS ON APPROACH TO RUNWAY 34R AT KSLC. THE BREAKING ACTION FROM AIRCRAFT LANDING IN FRONT OF N145SL WAS "GOOD" TO "FAIR." N145SL TOUCHED DOWN ON CENTERLINE WHEN THE PILOT FLYING (CAPTAIN) ASKED FOR "PROPS FORWARD." THE PILOT-NOT-FLYING PUSHED THE PROPS FORWARD AT WHICH TIME THE AIRCRAFT STARTED TO DRIFT TOWARDS THE LEFT. THE PILOT TRIED TO BRING THE AIRCRAFT BACK TOWARDS CENTER BUT WAS NOT ABLE. THE CENTER OF THE RUNWAY WAS CLEAR. ACCORDING TO THE PILOTS THE RUNWAY HAD SOME PATCHES OF SNOW AND SLUSH AND TOWARDS THE EDGE OF THE RUNWAY THERE WAS "UNPLOWED SHOULDERS WITH SEVERAL INCHES OF SNOW." ONCE THE AIRCRAFT ENTERED THE SNOW THE AIRCRAFT WENT OFF THE SIDE OF THE RUNWAY. FROM THE TIME THE AIRCRAFT SKID 1320 FEET UNTIL THE TIME THE AIRCRAFT CAME TO REST BETWEEN TAXIWAYS H7 AND H8. THE AIRCRAFT ALSO WAS TURNED APPROXIMATELY 150 DEGREES TOWARDS THE LEFT FROM RUNWAY HEADING. THE DAMAGE TO THE AIRCRAFT WAS MINOR. OUT OF THE 10 BLADES ONE WILL MOST LIKELY NOT BE ABLE TO BE BLENDED OR FILED. THE ONLY OTHER DAMAGE WAS TO THE UNDERSIDE OF THE LEFT VENTRICLE. NO OTHER DAMAGE WAS FOUND.