Commercial Fixed Wing
Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument
Deviation / Discrepancy - Procedural Published Material / Policy; Ground Event / Encounter Loss Of Aircraft Control; Ground Event / Encounter Weather / Turbulence
Flight Crew Regained Aircraft Control
Airport; Procedure; Weather
We landed at ORD on Runway 27C. Conditions were VFR; with 5's being reported as RCCs for 27C. Taxiways were slightly wet at time. We then were given taxi instructions consisting of 'E2 E M X4L G TT A'. Upon crossing 4L; Captain instructed First Officer to shut down engine 1. Upon making the turn from TT onto the A bridge; we started sliding to the left and almost off taxi; but stopped before then. Captain was taxiing slow given the wetness of Taxiways. However; we both did not realize that the bridge would be far more icy due to it being an overpass. We started engine one back up and continued taxi into gate uneventfully. Not anticipating the bridge being icy due to it being an overpass; which is always far colder. If we had realized that; we would have kept engine 1 running due to that possibility of ice contamination. Think ahead for the taxi and if in doubt of any portion of it being uncontaminated; do not taxi in single engine.
Air carrier First Officer reported that during single engine taxi on overpass taxiway-bridge; ice contamination resulted in aircraft sliding.