Air carrier medium large transport made a takeoff from the wrong runway at ord.

Attributes
ACN	194746
Time
Date	199111
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : ord
State Reference	IL
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : takeoff ground : holding ground other : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 120 flight time total : 14100 flight time type : 425
ASRS Report	194746
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	incursion : runway non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I was flying as first officer on a scheduled flight. Taxi instructions were to proceed by the outer and cargo taxiways to runway 22L. The captain seemed familiar with the taxi route, so I just made a quick glance at the airport diagram. While taxiing we were told to monitor the tower. We taxied up behind widebody transport that was turning left into the cargo area and we made a right turn into a runup pad ahead and came to a stop. I saw runway 27L ahead of us and thought the thresholds of 22L and 27L were in the same area and that we would cross 27L to get to 22L. As there was no traffic, I thought it was odd that the tower had not called us, so I called the tower and told them we were ready for takeoff. There was a pause and the tower said cleared for takeoff but didn't give a runway number. My response was cleared for takeoff, but I also didn't give a runway number. As we started taxiing my attention went to the checklist and I didn't realize that we turned on runway 27L and that is where we took off. I should have realized that something was not quite right by the way the takeoff clearance was issued by the tower and I should have looked at the airport diagram more closely in the areas of runways 22L and 27L.

Original NASA ASRS Text

Title: ACR MLG MADE A TKOF FROM THE WRONG RWY AT ORD.

Narrative: I WAS FLYING AS FO ON A SCHEDULED FLT. TAXI INSTRUCTIONS WERE TO PROCEED BY THE OUTER AND CARGO TAXIWAYS TO RWY 22L. THE CAPT SEEMED FAMILIAR WITH THE TAXI RTE, SO I JUST MADE A QUICK GLANCE AT THE ARPT DIAGRAM. WHILE TAXIING WE WERE TOLD TO MONITOR THE TWR. WE TAXIED UP BEHIND WDB THAT WAS TURNING L INTO THE CARGO AREA AND WE MADE A R TURN INTO A RUNUP PAD AHEAD AND CAME TO A STOP. I SAW RWY 27L AHEAD OF US AND THOUGHT THE THRESHOLDS OF 22L AND 27L WERE IN THE SAME AREA AND THAT WE WOULD CROSS 27L TO GET TO 22L. AS THERE WAS NO TFC, I THOUGHT IT WAS ODD THAT THE TWR HAD NOT CALLED US, SO I CALLED THE TWR AND TOLD THEM WE WERE READY FOR TKOF. THERE WAS A PAUSE AND THE TWR SAID CLRED FOR TKOF BUT DIDN'T GIVE A RWY NUMBER. MY RESPONSE WAS CLRED FOR TKOF, BUT I ALSO DIDN'T GIVE A RWY NUMBER. AS WE STARTED TAXIING MY ATTN WENT TO THE CHKLIST AND I DIDN'T REALIZE THAT WE TURNED ON RWY 27L AND THAT IS WHERE WE TOOK OFF. I SHOULD HAVE REALIZED THAT SOMETHING WAS NOT QUITE RIGHT BY THE WAY THE TKOF CLRNC WAS ISSUED BY THE TWR AND I SHOULD HAVE LOOKED AT THE ARPT DIAGRAM MORE CLOSELY IN THE AREAS OF RWYS 22L AND 27L.

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.