19940104001829I

Narrative: delta flt 1538 requested a visual approach to runway 18. The first officer contacted jac UNICOM and received wind and temp. Information. The first officer recalls hearing a Continental aircraft say that the south end of the runway was "slippery". Everything appeared normal to touchdown. Flaps 40 degrees, auto speed brakes, auto brakes were used. Vref speed was 126 knots for 102,800 pound landing wt. Touchdown was normal at or slightly before the glide slope touchdown point. Brakes and reverse were immediately applied approximately half way the runway. The surface became ice on top of hard packed snow. Braking action was nil and the aircraft began to skid and slide on the snow and ice. Maximum braking and reverse were used as the aircraft approached the end of the runway. The taxiway was completely covered with ice over hard pack snow and the aircraft slowly skidded approximately 10 to 15 feet off the taxiway. The aircraft came to a gentle stop. The first officer used the pa and told the passengers to remain in their seats. The passengers were deplaned through the rear door and taken to the terminal on buses.