The Aircraft Accident Investigation Bureau (AAIB) of Switzerland issued their final report of the investigation into the cause of a runway excursion accident involving a Bombardier BD-700 Global Express jet in February 2009, citing an unstabilized approach.
A Bombardier BD-700-1A10, registration N906JW, operated on a private flight from Warsaw (EPWA), Poland to Samedan (LSZS), Switzerland. The cockpit crew and two passengers were on board. This was this crew’s first flight to Samedan.The flight initially was carried out under instrument flight rules. Once the crew were able to make visual contact with the Samedan runway, the approach to Samedan started with the flight now under visual flight rules.It had snowed in Samedan until shortly before the arrival of N906JW. The runway was partly covered with snow and most of its surface was icy. Snow clearance was interrupted because of the aircraft arriving from Warsaw. After N906JW had to discontinue the approach to runway 03, it again flew a circuit at low altitude to commence a second approach.The aircraft touched down at approximately 450 m after the threshold of runway 03. The aircraft could not be decelerated sufficiently, such that the aircraft skidded over the end of the runway into a bank of snow and after rotating 80° clockwise around its vertical axis came to a standstill some 30 m beyond the runway. The occupants were not injured. The aircraft was damaged.
The accident is attributable to the fact that after an unstabilised approach the aircraft touched down on runway 03 too late and too fast and could not be brought to a standstill within the remaining distance on the snow-covered and partly iced runway.
The following factors contributed to the accident:
- Inadequate flight preparation
- An approach on a aerodrome in mountainous area under critical weather conditions