Narrative:

Chicago O'hare ground control cleared X to taxi to runway 4L via the 'silver-one' taxi routing. The captain and I discussed the written instructions for the silver -one routing and proceeded to taxi toward runway 4L. After starting the silver-one routing at taxiway intersection A6, we turned right onto taxiway B instead of taxiway J. O'hare ground control detected our error and provided instructions to repos the aircraft onto taxiway J. As we taxied on taxiway J we continued running the before takeoff checklist, 'down to the line.' as we approached the taxiway west intersection, I left the cockpit to conduct the predep contamination check in order to insure the wings were clear of snow accumulation. Upon returning to the cockpit, I failed to detect that we had not turned right onto taxiway west. We were holding short of runway 9L instead of runway 4L. As I returned to the cockpit, 'O'hare tower cleared us 'on to hold' runway 4L and we taxied into position on runway 9L. As the captain turned onto the runway, he realized our mistake and immediately advised tower we were in position on runway 9L. Tower sent an aircraft on approach for runway 9L around and gave us instructions to exit runway 9L and repos for runway 4L. We cleared the runway and subsequently departed runway 4L without further incident. I believe contributing factors to this incident are: 1) lack of familiarity with chicago txwys. 2) night. 3) snowing. 4) a subtle pressure to get in line and depart prior to exceeding our de-icing holdover time. 4) fatigue -- 10 1/2 hours into a 14 hour crew duty period.

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Original NASA ASRS Text

Title: ACR X RWY INCURSION TAXI INTO POS ON WRONG RWY CAUSED ACFT GAR.

Narrative: CHICAGO O'HARE GND CTL CLRED X TO TAXI TO RWY 4L VIA THE 'SILVER-ONE' TAXI RTING. THE CAPT AND I DISCUSSED THE WRITTEN INSTRUCTIONS FOR THE SILVER -ONE RTING AND PROCEEDED TO TAXI TOWARD RWY 4L. AFTER STARTING THE SILVER-ONE RTING AT TXWY INTXN A6, WE TURNED R ONTO TXWY B INSTEAD OF TXWY J. O'HARE GND CTL DETECTED OUR ERROR AND PROVIDED INSTRUCTIONS TO REPOS THE ACFT ONTO TXWY J. AS WE TAXIED ON TXWY J WE CONTINUED RUNNING THE BEFORE TKOF CHKLIST, 'DOWN TO THE LINE.' AS WE APCHED THE TXWY W INTXN, I LEFT THE COCKPIT TO CONDUCT THE PREDEP CONTAMINATION CHK IN ORDER TO INSURE THE WINGS WERE CLR OF SNOW ACCUMULATION. UPON RETURNING TO THE COCKPIT, I FAILED TO DETECT THAT WE HAD NOT TURNED R ONTO TXWY W. WE WERE HOLDING SHORT OF RWY 9L INSTEAD OF RWY 4L. AS I RETURNED TO THE COCKPIT, 'O'HARE TWR CLRED US 'ON TO HOLD' RWY 4L AND WE TAXIED INTO POS ON RWY 9L. AS THE CAPT TURNED ONTO THE RWY, HE REALIZED OUR MISTAKE AND IMMEDIATELY ADVISED TWR WE WERE IN POS ON RWY 9L. TWR SENT AN ACFT ON APCH FOR RWY 9L AROUND AND GAVE US INSTRUCTIONS TO EXIT RWY 9L AND REPOS FOR RWY 4L. WE CLRED THE RWY AND SUBSEQUENTLY DEPARTED RWY 4L WITHOUT FURTHER INCIDENT. I BELIEVE CONTRIBUTING FACTORS TO THIS INCIDENT ARE: 1) LACK OF FAMILIARITY WITH CHICAGO TXWYS. 2) NIGHT. 3) SNOWING. 4) A SUBTLE PRESSURE TO GET IN LINE AND DEPART PRIOR TO EXCEEDING OUR DE-ICING HOLDOVER TIME. 4) FATIGUE -- 10 1/2 HRS INTO A 14 HR CREW DUTY PERIOD.

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.