Narrative:

On taxi out at dfw, ground control initially advised us to taxi to runway 17R via standard route (which would be to exit via taxiway jy, turn right on taxiway Y, then left on taxiway left and hold short via taxiway eh and monitor tower on 126.55 north of taxiway Y). As we began to taxi up taxiway jy, ground revised his taxi instructions for us to now taxi via taxiway Z, left standard route. The first officer read back the new taxi instructions and confirmed with me that we were to now turn right on taxiway Z, then a left on taxiway left, then continue on taxiway left to taxiway eh for departure. I concurred and exited taxiway jy by turning right onto taxiway Z. As we taxied east on taxiway Z, I began a left turn onto taxiway K. The first officer brought it to my attention that it appeared that I was turning onto taxiway K and not taxiway left as previously cleared. The aircraft had already been turned more than 45 degrees onto taxiway K from taxiway Z. I concurred and recognized the error, but had taxied too far onto taxiway K to be able to correct the error and elected to continue the short distance on taxiway K, then transitioned to taxiway left after making the quick right turn onto taxiway Y. As this event occurred, there was no visible traffic on either side of our aircraft that were in any potential conflict with the incorrect taxi route which I followed. Supplemental information from acn 556047: after turning right onto taxiway Z, I began to resume accomplishment of the required before takeoff checklist items. As we taxied east on taxiway Z, the captain began a left turn onto taxiway K. As he initiated this turn, my eyes were inside the cockpit accomplishing before takeoff items. As we held short, the captain advised me to continue to monitor tower as he attempted to talk with ground control on the secondary frequency. Ground control was still busy and didn't appear to recognize what the captain was telling him and told him to monitor tower.

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Original NASA ASRS Text

Title: AN MD80 CREW, TAXIING FOR TKOF AT DFW, USED A TXWY NOT AUTH BY ATC.

Narrative: ON TAXI OUT AT DFW, GND CTL INITIALLY ADVISED US TO TAXI TO RWY 17R VIA STANDARD RTE (WHICH WOULD BE TO EXIT VIA TXWY JY, TURN R ON TXWY Y, THEN L ON TXWY L AND HOLD SHORT VIA TXWY EH AND MONITOR TWR ON 126.55 N OF TXWY Y). AS WE BEGAN TO TAXI UP TXWY JY, GND REVISED HIS TAXI INSTRUCTIONS FOR US TO NOW TAXI VIA TXWY Z, L STANDARD RTE. THE FO READ BACK THE NEW TAXI INSTRUCTIONS AND CONFIRMED WITH ME THAT WE WERE TO NOW TURN R ON TXWY Z, THEN A L ON TXWY L, THEN CONTINUE ON TXWY L TO TXWY EH FOR DEP. I CONCURRED AND EXITED TXWY JY BY TURNING R ONTO TXWY Z. AS WE TAXIED E ON TXWY Z, I BEGAN A L TURN ONTO TXWY K. THE FO BROUGHT IT TO MY ATTN THAT IT APPEARED THAT I WAS TURNING ONTO TXWY K AND NOT TXWY L AS PREVIOUSLY CLRED. THE ACFT HAD ALREADY BEEN TURNED MORE THAN 45 DEGS ONTO TXWY K FROM TXWY Z. I CONCURRED AND RECOGNIZED THE ERROR, BUT HAD TAXIED TOO FAR ONTO TXWY K TO BE ABLE TO CORRECT THE ERROR AND ELECTED TO CONTINUE THE SHORT DISTANCE ON TXWY K, THEN TRANSITIONED TO TXWY L AFTER MAKING THE QUICK R TURN ONTO TXWY Y. AS THIS EVENT OCCURRED, THERE WAS NO VISIBLE TFC ON EITHER SIDE OF OUR ACFT THAT WERE IN ANY POTENTIAL CONFLICT WITH THE INCORRECT TAXI RTE WHICH I FOLLOWED. SUPPLEMENTAL INFO FROM ACN 556047: AFTER TURNING R ONTO TXWY Z, I BEGAN TO RESUME ACCOMPLISHMENT OF THE REQUIRED BEFORE TKOF CHKLIST ITEMS. AS WE TAXIED E ON TXWY Z, THE CAPT BEGAN A L TURN ONTO TXWY K. AS HE INITIATED THIS TURN, MY EYES WERE INSIDE THE COCKPIT ACCOMPLISHING BEFORE TKOF ITEMS. AS WE HELD SHORT, THE CAPT ADVISED ME TO CONTINUE TO MONITOR TWR AS HE ATTEMPTED TO TALK WITH GND CTL ON THE SECONDARY FREQ. GND CTL WAS STILL BUSY AND DIDN'T APPEAR TO RECOGNIZE WHAT THE CAPT WAS TELLING HIM AND TOLD HIM TO MONITOR TWR.

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.