Date: 201303
Local time of day: 0001-0600
Location: ZZZ.Airport, US
Weather elements / visibility: Snow; 1.25
Light: Night
Aircraft: A300
Operator: Air Carrier
Operating under: Part 121
Mission: Cargo / Freight / Delivery
Flight phase: Taxi
ATC / advisory: Tower ZZZ
Reporter organization: Air Carrier
Reporter function: Pilot Not Flying; First Officer
Reporter qualification: Flight Crew Air Transport Pilot (ATP)
Second reporter function: Captain; Pilot Flying
Anomaly: Ground Event / Encounter Loss Of Aircraft Control; Ground Excursion Taxiway; Inflight Event / Encounter Weather / Turbulence
Detector: Person Flight Crew
When detected: Taxi
Result: General Maintenance Action
Contributing factors: Airport; Weather
Primary problem: Weather

Narrative: ZZZ weather was reported light snow. Runway XX was in use due to winds. On approach; I requested updated braking action reports and Tower reported fair with taxiways reported as slippery by aircraft that landed in front of us.We selected MED Autobrakes and the aircraft slowed with no problems. We were not able to make [our target] taxiway and continued to taxi to the end of the runway for turnoff. Tower cleared us to turn left on [a taxiway]; left on [another] and to contact Ground and advise when clear.Upon turning onto [the taxiway] the aircraft started to skid to the right. The Captain was able to steer the aircraft back toward centerline but then the aircraft started to skid to the left. The Captain did everything to try and regain control; but was unable. We both tried braking with no response. The aircraft came to a stop on the left side of the taxiway. It appeared we may have been over the taxi lights although we could not confirm that due to the snow cover.We made no attempts to move the aircraft at this point. I reported our position and intentions to the Tower and then contacted Company Maintenance for a tow. Maintenance and the ZZZ airport authority worked to tow us to the ramp. They determined we were still on the taxiway and had not hit any taxi lights. One taxiway light was removed by the airport authority during the tow process.No aircraft damage was suspected or found that I am aware of. The CVR circuit breaker was pulled per Maintenance Control. We remained with the aircraft until it was towed to the gate and we were released. The airport was reporting runway braking action but it would have helped to have taxiway reports that used a recognized scale of braking action.


Second narrative: ATIS winds were 330 at 18 KTS with gusts to 22 KTS with 1 1/4 mile visibility in light snow and mist. As I approached the taxiway; I slowed the aircraft to 8 KTS. Upon entering the turn; the aircraft started a skid to the right. I used full tiller and differential braking to get the aircraft tracking towards centerline. As the aircraft approached centerline; I put in right tiller. At this time the aircraft started skidding left. I applied more right tiller; differential braking; and differential thrust to get the aircraft to correct back towards centerline. The First Officer advised the Tower that we had come to a stop off the surface and to notify aircraft landing behind us. During the straightening process; it took a load of sand and two tugs to move the aircraft.


Synopsis: While attempting to turn off the end of the slippery runway in a strong crosswind the flight crew of an A300 was unable to stop the aircraft nose from sliding to the left.  The crew believed they had left the hard surface and called for a tow.