What happened
During the landing phase at the destination airport, a business jet touched down approximately 2,500 feet past the runway threshold on a 10,000-foot runway. Following touchdown, the crew deployed the flight spoilers and tried to engage the thrust reversers. However, the aircraft failed to slow down as anticipated, and a warning horn began to sound. The crew attempted to use both standard and emergency braking systems, but these measures failed to reduce the aircraft's speed.
The aircraft eventually exited the runway, colliding with several approach lighting stanchions. The impact caused the landing gear to collapse, and the aircraft came to a final stop. While there were zero fatalities and zero injuries among the occupants, the aircraft sustained substantial damage.
Findings
An investigation revealed that the captain had neglected to move the thrust reverser emergency stow switches from the stowed position back to their normal setting following a preflight inspection. The warning horn heard during the landing sequence was triggered by the switches being in the stowed position. It is believed that the braking was ineffective because the engines produced increased thrust when the crew attempted to use the thrust reversers while the switches were stowed.
Post-accident inspections of the wreckage showed no mechanical failures or malfunctions that would have prevented the aircraft from operating normally. Additionally, the checklist present in the cockpit was noted as being for training purposes only and was intended for an aircraft model that lacked thrust reverser equipment.