Commercial Fixed Wing
Ground Event / Encounter Other / Unknown
Human Factors; Weather
We moved aircraft from the gate to the North Ramp. When we approached the North Ramp; we hit a sheet of ice. We tried to come out of the turn but jacked knife the tug. In that area; you go from a high elevation to a low elevation. The whole area was iced up.
Tractor driver reported losing control of the tug while towing across an icy ramp.