Narrative:

The rain stopped but the conditions on the runway were reported as poor to nil for braking action. We sat in the aircraft for 2 hours before we decided to go. Conditions had improved braking actions were reported as fair to good on txwys and runways. Visibility was 3 mi. Winds 150 degrees at 15 KTS. It took nearly an hour to deice us. We blocked out at XA32Z. We were cleared to taxi to runway 12R via taxiway K, runway 13 and 31, taxiway F to taxiway M. The taxi surface was snow covered and the centerline areas were sanded. The initial taxi phase was normal, but as we approached runway 17 and 35, the captain accelerated (possibly out of habit when crossing another runway) but he did not slow it down once we had crossed. As we approached the turn off taxiway K onto runway 13 and 31, I felt we were too fast. We began the turn and the aircraft seemed to take the turn well. As we made the turn, I stated I felt we were too fast and we needed to slow down. The captain overshot the turn and we were well left of centerline. He corrected back to the right and the aircraft stopped responding to inputs. We were sliding right. The captain attempted to arrest the slide by using reverse thrust, but it was ineffective. The aircraft came to rest with the nosewheel approximately 18 inches off the asphalt. The main gear remained on the asphalt. The captain suggested using reverse thrust to back out, but I stated I did not think that was a good idea. The aircraft was subsequently towed out. There was no damage to the plane. When I asked the captain why he let the aircraft accelerate, he stated he didn't want to get 'bogged' down in the snow. Lessons learned: 1) at the first feeling of discomfort, say something. 2) when operating in unusual conditions, talk about the plan of action. If the captain had told me he planned to keep the speed up on the taxi, I would have vetoed the idea based on the conditions. 3) don't assume. I assumed we would be taxiing slowly. The captain had other plans. 4) get a good braking action report on your taxi route. The other side was good, but the cargo side was not. We took taxiway braking action as good to mean all txwys. The one we slid off of was one half inch ice covered by snow.

Google
 

Original NASA ASRS Text

Title: TXWY EXCURSION OF A B727 PIC AS HE TAXIED TOO FAST ROUNDING THE TURN ON A SLIPPERY TXWY.

Narrative: THE RAIN STOPPED BUT THE CONDITIONS ON THE RWY WERE RPTED AS POOR TO NIL FOR BRAKING ACTION. WE SAT IN THE ACFT FOR 2 HRS BEFORE WE DECIDED TO GO. CONDITIONS HAD IMPROVED BRAKING ACTIONS WERE RPTED AS FAIR TO GOOD ON TXWYS AND RWYS. VISIBILITY WAS 3 MI. WINDS 150 DEGS AT 15 KTS. IT TOOK NEARLY AN HR TO DEICE US. WE BLOCKED OUT AT XA32Z. WE WERE CLRED TO TAXI TO RWY 12R VIA TXWY K, RWY 13 AND 31, TXWY F TO TXWY M. THE TAXI SURFACE WAS SNOW COVERED AND THE CTRLINE AREAS WERE SANDED. THE INITIAL TAXI PHASE WAS NORMAL, BUT AS WE APCHED RWY 17 AND 35, THE CAPT ACCELERATED (POSSIBLY OUT OF HABIT WHEN XING ANOTHER RWY) BUT HE DID NOT SLOW IT DOWN ONCE WE HAD CROSSED. AS WE APCHED THE TURN OFF TXWY K ONTO RWY 13 AND 31, I FELT WE WERE TOO FAST. WE BEGAN THE TURN AND THE ACFT SEEMED TO TAKE THE TURN WELL. AS WE MADE THE TURN, I STATED I FELT WE WERE TOO FAST AND WE NEEDED TO SLOW DOWN. THE CAPT OVERSHOT THE TURN AND WE WERE WELL L OF CTRLINE. HE CORRECTED BACK TO THE R AND THE ACFT STOPPED RESPONDING TO INPUTS. WE WERE SLIDING R. THE CAPT ATTEMPTED TO ARREST THE SLIDE BY USING REVERSE THRUST, BUT IT WAS INEFFECTIVE. THE ACFT CAME TO REST WITH THE NOSEWHEEL APPROX 18 INCHES OFF THE ASPHALT. THE MAIN GEAR REMAINED ON THE ASPHALT. THE CAPT SUGGESTED USING REVERSE THRUST TO BACK OUT, BUT I STATED I DID NOT THINK THAT WAS A GOOD IDEA. THE ACFT WAS SUBSEQUENTLY TOWED OUT. THERE WAS NO DAMAGE TO THE PLANE. WHEN I ASKED THE CAPT WHY HE LET THE ACFT ACCELERATE, HE STATED HE DIDN'T WANT TO GET 'BOGGED' DOWN IN THE SNOW. LESSONS LEARNED: 1) AT THE FIRST FEELING OF DISCOMFORT, SAY SOMETHING. 2) WHEN OPERATING IN UNUSUAL CONDITIONS, TALK ABOUT THE PLAN OF ACTION. IF THE CAPT HAD TOLD ME HE PLANNED TO KEEP THE SPD UP ON THE TAXI, I WOULD HAVE VETOED THE IDEA BASED ON THE CONDITIONS. 3) DON'T ASSUME. I ASSUMED WE WOULD BE TAXIING SLOWLY. THE CAPT HAD OTHER PLANS. 4) GET A GOOD BRAKING ACTION RPT ON YOUR TAXI RTE. THE OTHER SIDE WAS GOOD, BUT THE CARGO SIDE WAS NOT. WE TOOK TXWY BRAKING ACTION AS GOOD TO MEAN ALL TXWYS. THE ONE WE SLID OFF OF WAS ONE HALF INCH ICE COVERED BY SNOW.

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.