Commercial Fixed Wing
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Troubleshooting
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Event / Encounter Loss Of Aircraft Control; Ground Event / Encounter Weather / Turbulence
Flight Crew Overcame Equipment Problem; Flight Crew Regained Aircraft Control
Weather; Aircraft
After pushback from gate in BWI; the ground crew removed the steering bypass pin.  They did not verify the bypass handle had returned to the normal steering position.  Pushback was stopped early because tug began to slide on the ramp.  We disconnected within 10 feet of the normal engine start position.  After engine start as I attempted to taxi due to a very slippery ramp condition we immediately began to slide without nose wheel steering.  I stopped the aircraft and reported poor to nil braking on the ramp thinking the slide was caused by outside conditions.  We advised ATC we were holding our position.  Maintenance came out to the aircraft and after plugging in reported that the bypass lever had inadvertently been stuck in the bypass position after the pin was removed.  The aircraft had been on the ground for four to five hours in freezing precipitation.  We had deiced at the gate but I am unsure if remaining frozen contamination caused the lever to not spring back to the normal position.  We advised ATC that we had found a stuck bypass lever and were now ready to taxi.  Ramps and taxiways were poor as [Air Carrier] had an Aircraft X slide off Taxiway F across from the Midfield Freight area.
After pushback ground crew failed to complete proper steps to reengage nose wheel steering. Air carrier flight crew noticed immediately upon taxi out they had no control over aircraft steering.