Narrative:

Our 737-300 was landed on runway 20 at ida by the captain. After making a complete stop we made a left turn onto taxiway A-3 which had patchy snow. At a slow walk speed we again made a left turn. Through about 45 degrees of the turn the aircraft no longer turned left but slid right. The captain immediately applied brakes and reverse thrust, but the latter didn't respond in time due to the slow spool-up of the cfm-56 engines. The aircraft came to rest parallel to taxiway a with the right main and nose gear wheels off the taxiway in the snow. We immediately shutdown the engines, informed the passenger and ground control. We then requested a sanding truck to be able to get other vehicles out safely to aid us. Unfortunately getting a bus for the passenger took an excessive amount of time, 1 plus 30 mins. A mechanic looked the aircraft over and determined it was safe to pull it out of the snow. A tug and tractor pulled the aircraft out and over to the gate where maintenance once again checked over the aircraft and found no damage. Maintenance control was consulted throughout this process and we flew the aircraft to slc. We were told there had been precipitation earlier in the afternoon and on landing the temperature was 26 degrees, which probably led to black ice forming on the taxiway. The area had been checked an hour before our landing and was clear. No other aircraft had used the taxiway since that check. I realize it is unfeasible to check the txwys before each plane lands. Possibly more attention could be directed to the taxiway that leads directly into the ramp from the runway and have aircraft back-taxi to it if precipitation and freezing temperatures occur prior to arrival time.

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Original NASA ASRS Text

Title: TXWY EXCURSION.

Narrative: OUR 737-300 WAS LANDED ON RWY 20 AT IDA BY THE CAPT. AFTER MAKING A COMPLETE STOP WE MADE A L TURN ONTO TXWY A-3 WHICH HAD PATCHY SNOW. AT A SLOW WALK SPD WE AGAIN MADE A L TURN. THROUGH ABOUT 45 DEGS OF THE TURN THE ACFT NO LONGER TURNED L BUT SLID R. THE CAPT IMMEDIATELY APPLIED BRAKES AND REVERSE THRUST, BUT THE LATTER DIDN'T RESPOND IN TIME DUE TO THE SLOW SPOOL-UP OF THE CFM-56 ENGS. THE ACFT CAME TO REST PARALLEL TO TXWY A WITH THE R MAIN AND NOSE GEAR WHEELS OFF THE TXWY IN THE SNOW. WE IMMEDIATELY SHUTDOWN THE ENGS, INFORMED THE PAX AND GND CTL. WE THEN REQUESTED A SANDING TRUCK TO BE ABLE TO GET OTHER VEHICLES OUT SAFELY TO AID US. UNFORTUNATELY GETTING A BUS FOR THE PAX TOOK AN EXCESSIVE AMOUNT OF TIME, 1 PLUS 30 MINS. A MECH LOOKED THE ACFT OVER AND DETERMINED IT WAS SAFE TO PULL IT OUT OF THE SNOW. A TUG AND TRACTOR PULLED THE ACFT OUT AND OVER TO THE GATE WHERE MAINT ONCE AGAIN CHKED OVER THE ACFT AND FOUND NO DAMAGE. MAINT CTL WAS CONSULTED THROUGHOUT THIS PROCESS AND WE FLEW THE ACFT TO SLC. WE WERE TOLD THERE HAD BEEN PRECIPITATION EARLIER IN THE AFTERNOON AND ON LNDG THE TEMP WAS 26 DEGS, WHICH PROBABLY LED TO BLACK ICE FORMING ON THE TXWY. THE AREA HAD BEEN CHKED AN HR BEFORE OUR LNDG AND WAS CLR. NO OTHER ACFT HAD USED THE TXWY SINCE THAT CHK. I REALIZE IT IS UNFEASIBLE TO CHK THE TXWYS BEFORE EACH PLANE LANDS. POSSIBLY MORE ATTN COULD BE DIRECTED TO THE TXWY THAT LEADS DIRECTLY INTO THE RAMP FROM THE RWY AND HAVE ACFT BACK-TAXI TO IT IF PRECIPITATION AND FREEZING TEMPS OCCUR PRIOR TO ARR TIME.

Data retrieved from NASA's ASRS site as of July 2007 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.