Falcon 20FJF/20C/20D/20E/20F
Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Flight Crew Last 90 Days 90; Flight Crew Total 8000; Flight Crew Type 1200
Other / Unknown
Ground Excursion Runway
General None Reported / Taken
Airport; Human Factors; Weather
After landing; aircraft experienced poor to nil braking action. Forecast was for light snow. No braking action reports or runway condition reports had been issued. Aircraft ran off the end of the runway and stopped in the grass. There was no damage to the aircraft or airport property. From the air; the runway looked to have a thin layer of snow with pavement visible underneath. On the ground; it was discovered that the contamination was snow on a thin layer of ice.
Falcon 20 Captain reported landing in light snow to discover nil braking action. The aircraft stopped past the end of the runway with no damage.