Narrative:

Following loading aircraft was deiced then anti-iced. Obtained clearance; blocked out; started engines; and began taxiing. ATIS reported txwys 100% covered with loose compacted snow less than 1/2 inch thick. Taxiway condition reported poor by vehicle. Snowfall continued and all ramps and txwys were observed covered with snow. We taxied slow. Incident information: we taxied up a slight gradient on taxiway east. We began a right turn onto taxiway a. The aircraft began to slide slightly and resisted turning. The captain used differential thrust (applied power to the left engine) to enable the right turn. The aircraft turned to the right and the captain reduced power on the left engine to idle. The aircraft continued turning to the right sliding past the alignment for taxiway a. The captain applied brakes and used reverse thrust to stop the aircraft. The aircraft stopped and was pointing off taxiway a near the right edge. We reported the incident to ground control and they told us to contact operations to get a tug. Additional information: dispatch was notified we were stuck in the snow. Maintenance arrived 10-15 mins later. They brought a tug; snowplow and some additional equipment. We shut down both engines. The snowplow removed snow in front of the nosewheel and prepared a clear area for the tug. Maintenance inspected the taxiway and ensured no taxi lights were damaged. They also looked over the aircraft and ensured no damage occurred to the main or nose landing gear or any other part of the aircraft. They observed our position on the taxiway. Maintenance connected the tug and pushed the aircraft to the center of taxiway a with correct alignment. We restarted both engines; ran all appropriate checklists; proceeded to taxi and continued to destination.

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Original NASA ASRS Text

Title: B767-300 LOST DIRECTIONAL CONTROL OF ACFT WHILE TAXIING ON SNOW COVERED TXWY. ACFT STOPPED AND TUG REQUESTED.

Narrative: FOLLOWING LOADING ACFT WAS DEICED THEN ANTI-ICED. OBTAINED CLRNC; BLOCKED OUT; STARTED ENGS; AND BEGAN TAXIING. ATIS RPTED TXWYS 100% COVERED WITH LOOSE COMPACTED SNOW LESS THAN 1/2 INCH THICK. TXWY CONDITION RPTED POOR BY VEHICLE. SNOWFALL CONTINUED AND ALL RAMPS AND TXWYS WERE OBSERVED COVERED WITH SNOW. WE TAXIED SLOW. INCIDENT INFO: WE TAXIED UP A SLIGHT GRADIENT ON TXWY E. WE BEGAN A R TURN ONTO TXWY A. THE ACFT BEGAN TO SLIDE SLIGHTLY AND RESISTED TURNING. THE CAPT USED DIFFERENTIAL THRUST (APPLIED PWR TO THE L ENG) TO ENABLE THE R TURN. THE ACFT TURNED TO THE R AND THE CAPT REDUCED PWR ON THE L ENG TO IDLE. THE ACFT CONTINUED TURNING TO THE R SLIDING PAST THE ALIGNMENT FOR TXWY A. THE CAPT APPLIED BRAKES AND USED REVERSE THRUST TO STOP THE ACFT. THE ACFT STOPPED AND WAS POINTING OFF TXWY A NEAR THE R EDGE. WE RPTED THE INCIDENT TO GND CTL AND THEY TOLD US TO CONTACT OPS TO GET A TUG. ADDITIONAL INFO: DISPATCH WAS NOTIFIED WE WERE STUCK IN THE SNOW. MAINT ARRIVED 10-15 MINS LATER. THEY BROUGHT A TUG; SNOWPLOW AND SOME ADDITIONAL EQUIP. WE SHUT DOWN BOTH ENGS. THE SNOWPLOW REMOVED SNOW IN FRONT OF THE NOSEWHEEL AND PREPARED A CLR AREA FOR THE TUG. MAINT INSPECTED THE TXWY AND ENSURED NO TAXI LIGHTS WERE DAMAGED. THEY ALSO LOOKED OVER THE ACFT AND ENSURED NO DAMAGE OCCURRED TO THE MAIN OR NOSE LNDG GEAR OR ANY OTHER PART OF THE ACFT. THEY OBSERVED OUR POS ON THE TXWY. MAINT CONNECTED THE TUG AND PUSHED THE ACFT TO THE CTR OF TXWY A WITH CORRECT ALIGNMENT. WE RESTARTED BOTH ENGS; RAN ALL APPROPRIATE CHKLISTS; PROCEEDED TO TAXI AND CONTINUED TO DEST.

Data retrieved from NASA's ASRS site as of January 2009 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.