Narrative:

After landing on 15L we tried to make the hard turn onto taxiway F. Due to poor taxiway conditions were unable to make the turn and had to taxi south cross the airfield and then proceed to [the] ramp. While on taxiway a we were told to cross 15L at right and turn right on east. While making the turn right onto east the airplane nose started to slide past centerline. Captain made a comment about not being in control. As we continued to slide and were heading to the edge of the taxiway I made the comment to use reverse to try and stop us. Captain at the same time began applying reverse thrust. Due to blowing snow caused by reverse thrust we lost outside visual references for as second and the aircraft came to a stop about 30 to 45 degrees off centerline. After a short discussion and not being able to confirm our position we decided it was too risky to try to move. Airport safety came and checked our position and said all three gear where on the stressed pavement. We agreed that we needed to be towed and not try to move the aircraft. We had to wait for contract support to tow us out.there were two events that may have been a factor in this event. Because we could not make the hard right turn off of runway 15R onto F we were forced to taxi on a route that had not been used by other aircraft and not been plowed or plowed recently. The second factor is that the aircraft was loaded in [the departure airport] with an aft center of gravity (cg) for fuel management. In the ramp and taxiway conditions we had at cyyz we should have been loaded with a more forward cg to aid in steering on poor taxiway and ramp conditions.load aircraft with forward cg to aid in steering during poor ramp conditions. We should ensure that when taxiing under poor ramp and taxiway conditions that we are given a route that is on taxiways that have been plowed or used recently.

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Original NASA ASRS Text

Title: Air carrier First Officer reported losing control of aircraft due to icing conditions during taxi at CYYZ requiring reverse thrust to stop the aircraft.

Narrative: After Landing on 15L we tried to make the hard turn onto taxiway F. Due to poor taxiway conditions were unable to make the turn and had to taxi south cross the airfield and then proceed to [the] Ramp. While on Taxiway A we were told to cross 15L at R and turn right on E. While making the turn right onto E the airplane nose started to slide past centerline. Captain made a comment about not being in control. As we continued to slide and were heading to the edge of the Taxiway I made the comment to use reverse to try and stop us. Captain at the same time began applying reverse thrust. Due to blowing snow caused by reverse thrust we lost outside visual references for as second and the aircraft came to a stop about 30 to 45 degrees off centerline. After a short discussion and not being able to confirm our position we decided it was too risky to try to move. Airport safety came and checked our position and said all three gear where on the stressed pavement. We agreed that we needed to be towed and not try to move the aircraft. We had to wait for contract support to tow us out.There were two events that may have been a factor in this event. Because we could not make the hard right turn off of Runway 15R onto F we were forced to taxi on a route that had not been used by other aircraft and not been plowed or plowed recently. The second factor is that the aircraft was loaded in [the departure airport] with an aft Center of Gravity (CG) for fuel management. In the ramp and taxiway conditions we had at CYYZ we should have been loaded with a more forward CG to aid in steering on poor taxiway and ramp conditions.Load aircraft with forward CG to aid in steering during poor ramp conditions. We should ensure that when taxiing under poor ramp and taxiway conditions that we are given a route that is on taxiways that have been plowed or used recently.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.