Date: 201402
Local time of day: 0601-1200
Location: CYMX.Airport, FO
Flight conditions: VMC
Weather elements / visibility: Rain; Icing
Light: Dawn
Aircraft: Widebody Transport
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Flight phase: Taxi
ATC / advisory: Tower CYMX
Reporter organization: Air Carrier
Reporter function: First Officer; Pilot Not Flying
Second reporter function: Captain; Pilot Flying
Anomaly: Ground Event / Encounter Loss Of Aircraft Control
Detector: Person Flight Crew
When detected: Taxi
Result: Flight Crew Became Reoriented
Contributing factors: Airport; Weather
Primary problem: Ambiguous

Narrative: I was the pilot not flying for the approach and landing in CYMX. It was an uneventful landing and rollout. The ATIS was reporting light freezing rain and Tower informed us the runway had been treated. He also informed us that some taxiways had not yet been treated and they might be slick. I reported braking action good as we exited the runway. Taxing to the ramp was initially uneventful until we hit a slick spot on Taxiway J. This taxiway had not yet been treated. Our taxi speed was very slow at this point; so it did not cause a problem. There was a 757 taxiing to the ramp in front of us and he appeared not to have any problems taxiing so we continued our taxi at a very slow speed. We made the turn onto Taxiway F. About halfway down F the Captain informed me she 'was standing on the brakes.' The aircraft was not responding; at this point she applied the parking brake and still the airplane did not respond. Now the airplane began to slide sideways to the left and the Captain applied reverse thrust and the airplane came to a stop. We called Tower and advised them of the conditions on Taxiway F. We also advised we would be shutting down the engines and we would need to be towed to our parking spot. They offered to have one of their trucks come treat the taxiway in front of us so that we could continue our taxi. We declined and requested the tug come out to our position and tow us in. When the Maintenance personnel arrived to hooked up the tug they told us that we had hit one of the blue above ground taxiway lights as we slid sideways. The aircraft never left the prepared surface and there was no damage to the aircraft. The only damage was the broken taxiway light. The taxiway was treated and we were towed to parking. After we secured the aircraft the gateway personnel said they often have problems with freezing rain and slick taxiways. They said you can call Tower and request a truck come out to treat the taxiways in front of the aircraft as you taxi to the ramp. I think this information about the truck treating the taxiways as you follow him to parking needs to be on the Briefing page. This incident may have been avoided had we known.


Second narrative: Upon arrival in CYMX; the good weather on descent had materialized into light freezing rain/rain. CYMX had treated the runway and we landed uneventfully on Runway 06. (Receiving a bleed leak 2 on short final which also removed our wing heat). The braking action was good and we taxied clear of runway at B5 and slowly moved towards cargo ramp. CYMX was treating the taxiways and said there might be some slick areas especially where they had not treated. We reduced our taxi speeds for the conditions to extremely slow 1-5 to ensure we could always stop and get a tow; if necessary. A cargo jet had just taxied in prior to our arrival with no issues. I made the last 90 degree turn onto Taxiway F and slowed to enter the ramp. About halfway down the decline; [the] jet wanted to pick up extra speed and I applied my brakes [but] received no feedback. The aircraft slid slightly to left and I used brakes; parking brake; etc'' and finally came to a stop where we called for a tow and shut down. Maintenance informed us when they got on headset that we had knocked one of the above ground blue taxi lights off; but no damage to aircraft tire and the light was returned to security for reinstallation. We were tugged in and able to exit aircraft safely. Ramp personnel informed us; after the incident; of an option of a gravel truck to proceed us for traction since this had been an ongoing issue in CYMX. This information would have been nice to know. We were queried about treating taxi route in front after we stopped so we could continue our taxi but we declined and maintained the decision for a tow.


Synopsis: Widebody flight crew reports sliding on a slippery taxiway during taxi to parking after landing at CYMX. A taxi light is damaged and the the aircraft is towed to parking.