What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) During landing roll on runway 02 at Keene airport, the pilot encountered a patch of slush on the runway apparently caused by melting snow from the snow-clearing operations being conducted at the time. The pilot stated that his touch down was on the centerline approx. 500 feet down the runway. As he was rolling out the aircraft began veering to the left. Before he realized what had happened the aircraft was uncontrollable and began sliding sideways after an abrupt left ground-loop. The aircraft slid side-ways approx. 50 feet. The right wing contacted the runway from the rolling motion causing the outboard section to be bent upward at approx. 60 degree angle. The aircraft came to rest in a snow bank on the left side of the runway. At the time of the accident there was a NOTAM in effect for patches of packed snow and ice on the runway (runway 02/20). There was no NOTAM for the slush on the runway but weather conditions at the time appeared to favor its formation (1 degree centigrade, snow being blown towards the runway from the snow-clearing operation, and wind from 360 degrees at 6 knots). (.4) the pilot flew a normal approach, and landed the airplane, with the th rottle closed, on a runway with patches of slushy snow and ice, and some blowing dry snow. The airplane touched down on centerline, about 60 knots, and the pilot kept his feet off the brakes during rollout. About 500 feet into the rollout, the airplane began to yaw, then slowly veer and skid to the left. The pilot attempted to straighten the airplane by increasing right rudder pressure. He also considered aborting the landing, but given the airplane's slow speed, and its proximity to a 4-foot snow bank, he decided an abort would be unsuccessful. The airplane continued to veer to the left, and hit the snow bank at approximately a 30-degree angle, about 30 miles per hour. Winds, about the time of the accident, were from approximately 15 degrees left of the runway, at 5 knots. The pilot had 92 hours of flight time, with previous experience landing on contaminated runways.
As the FAA filed it
(-23) DURING LANDING ROLL ON RUNWAY 02 AT KEENE AIRPORT, THE PILOT ENCOUNTERED A PATCH OF SLUSH ON THE RUNWAY APPARENTLY CAUSED BY MELTING SNOW FROM THE SNOW-CLEARING OPERATIONS BEING CONDUCTED AT THE TIME. THE PILOT STATED THAT HIS TOUCH DOWN WAS ON THE CENTERLINE APPROX. 500 FEET DOWN THE RUNWAY. AS HE WAS ROLLING OUT THE AIRCRAFT BEGAN VEERING TO THE LEFT. BEFORE HE REALIZED WHAT HAD HAPPENED THE AIRCRAFT WAS UNCONTROLLABLE AND BEGAN SLIDING SIDEWAYS AFTER AN ABRUPT LEFT GROUND-LOOP. THE AIRCRAFT SLID SIDE-WAYS APPROX. 50 FEET. THE RIGHT WING CONTACTED THE RUNWAY FROM THE ROLLING MOTION CAUSING THE OUTBOARD SECTION TO BE BENT UPWARD AT APPROX. 60 DEGREE ANGLE. THE AIRCRAFT CAME TO REST IN A SNOW BANK ON THE LEFT SIDE OF THE RUNWAY. AT THE TIME OF THE ACCIDENT THERE WAS A NOTAM IN EFFECT FOR PATCHES OF PACKED SNOW AND ICE ON THE RUNWAY (RUNWAY 02/20). THERE WAS NO NOTAM FOR THE SLUSH ON THE RUNWAY BUT WEATHER CONDITIONS AT THE TIME APPEARED TO FAVOR ITS FORMATION (1 DEGREE CENTIGRADE, SNOW BEING BLOWN TOWARDS THE RUNWAY FROM THE SNOW-CLEARING OPERATION, AND WIND FROM 360 DEGREES AT 6 KNOTS). (.4) THE PILOT FLEW A NORMAL APPROACH, AND LANDED THE AIRPLANE, WITH THE TH ROTTLE CLOSED, ON A RUNWAY WITH PATCHES OF SLUSHY SNOW AND ICE, AND SOME BLOWING DRY SNOW. THE AIRPLANE TOUCHED DOWN ON CENTERLINE, ABOUT 60 KNOTS, AND THE PILOT KEPT HIS FEET OFF THE BRAKES DURING ROLLOUT. ABOUT 500 FEET INTO THE ROLLOUT, THE AIRPLANE BEGAN TO YAW, THEN SLOWLY VEER AND SKID TO THE LEFT. THE PILOT ATTEMPTED TO STRAIGHTEN THE AIRPLANE BY INCREASING RIGHT RUDDER PRESSURE. HE ALSO CONSIDERED ABORTING THE LANDING, BUT GIVEN THE AIRPLANE'S SLOW SPEED, AND ITS PROXIMITY TO A 4-FOOT SNOW BANK, HE DECIDED AN ABORT WOULD BE UNSUCCESSFUL. THE AIRPLANE CONTINUED TO VEER TO THE LEFT, AND HIT THE SNOW BANK AT APPROXIMATELY A 30-DEGREE ANGLE, ABOUT 30 MILES PER HOUR. WINDS, ABOUT THE TIME OF THE ACCIDENT, WERE FROM APPROXIMATELY 15 DEGREES LEFT OF THE RUNWAY, AT 5 KNOTS. THE PILOT HAD 92 HOURS OF FLIGHT TIME, WITH PREVIOUS EXPERIENCE LANDING ON CONTAMINATED RUNWAYS.
NTSB investigation
The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.