What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
On August 10, 2010, at 0818 MDT, a Piper PA-18A, N2660A, registered to 172 LLC, during landing at the Billings Logan international airport (bil), went off runway 28L in uncontrolled flight and came to rest in the grass between runways 28L and 25. This was a pleasure flight. Visual meteorological conditions prevailed at the time with a light south wind (180/6), and no flight plan was filed. The aircraft was substantially damaged, and the pilot-in-command and passenger sustained minor injuries. The flight had originated in laurel, Montana (6S8). At the same time of the loss of control of N2660A, an EC-135P1 helicopter, N911SV, was landing in the opposite direction and abeam N2660A on taxiway h. taxiway h is parallel to and south of runway 28L. The helicopter was landing eastbound while the airplane was landing westbound. Both aircraft were operating under the control of the bil ATCT. N911SV has a 39' main rotor diameter. Lateral separation was 200' from center of taxiway h to center of runway 28L; and 140' from the edge of taxiway h to the edge of runway 28L.
As the FAA filed it
ON AUGUST 10, 2010, AT 0818 MDT, A PIPER PA-18A, N2660A, REGISTERED TO 172 LLC, DURING LANDING AT THE BILLINGS LOGAN INTERNATIONAL AIRPORT (BIL), WENT OFF RUNWAY 28L IN UNCONTROLLED FLIGHT AND CAME TO REST IN THE GRASS BETWEEN RUNWAYS 28L AND 25. THIS WAS A PLEASURE FLIGHT. VISUAL METEOROLOGICAL CONDITIONS PREVAILED AT THE TIME WITH A LIGHT SOUTH WIND (180/6), AND NO FLIGHT PLAN WAS FILED. THE AIRCRAFT WAS SUBSTANTIALLY DAMAGED, AND THE PILOT-IN-COMMAND AND PASSENGER SUSTAINED MINOR INJURIES. THE FLIGHT HAD ORIGINATED IN LAUREL, MONTANA (6S8). AT THE SAME TIME OF THE LOSS OF CONTROL OF N2660A, AN EC-135P1 HELICOPTER, N911SV, WAS LANDING IN THE OPPOSITE DIRECTION AND ABEAM N2660A ON TAXIWAY H. TAXIWAY H IS PARALLEL TO AND SOUTH OF RUNWAY 28L. THE HELICOPTER WAS LANDING EASTBOUND WHILE THE AIRPLANE WAS LANDING WESTBOUND. BOTH AIRCRAFT WERE OPERATING UNDER THE CONTROL OF THE BIL ATCT. N911SV HAS A 39' MAIN ROTOR DIAMETER. LATERAL SEPARATION WAS 200' FROM CENTER OF TAXIWAY H TO CENTER OF RUNWAY 28L; AND 140' FROM THE EDGE OF TAXIWAY H TO THE EDGE OF RUNWAY 28L.
NTSB investigation
The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.