Narrative:

I was the PF and just started to accelerate at about 10800'. At approximately 12000' the captain saw on his side of the airplane another twin which he said was taking evasive action to miss us. We reported the occurrence to ATC and they said there was an light transport in our vicinity which had broke his altitude. Supplemental information from acn 88802: I asked for a phone number to call the controller in ord. I called at xapm but the controller had gone home for the evening. He left his home phone number, but I elected not to call him at home. At time of the encounter I had assigned both myself and the second officer traffic watch. All of our lights were on per company SOP. I feel that these lights, required to be on until reaching 18000', helped to prevent a major accident as did the new company SOP of assigning a formal traffic watch. Supplemental information from acn 88802: later chicago center supervisor indicated possible controller error and the other aircraft was an light transport. Estimated closest sep was 1200'.

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Original NASA ASRS Text

Title: EVASIVE ACTION BY CPR-LTT TO AVOID COLLISION WITH CLIMBING ACR-LGT.

Narrative: I WAS THE PF AND JUST STARTED TO ACCELERATE AT ABOUT 10800'. AT APPROX 12000' THE CAPT SAW ON HIS SIDE OF THE AIRPLANE ANOTHER TWIN WHICH HE SAID WAS TAKING EVASIVE ACTION TO MISS US. WE RPTED THE OCCURRENCE TO ATC AND THEY SAID THERE WAS AN LTT IN OUR VICINITY WHICH HAD BROKE HIS ALT. SUPPLEMENTAL INFO FROM ACN 88802: I ASKED FOR A PHONE NUMBER TO CALL THE CTLR IN ORD. I CALLED AT XAPM BUT THE CTLR HAD GONE HOME FOR THE EVENING. HE LEFT HIS HOME PHONE NUMBER, BUT I ELECTED NOT TO CALL HIM AT HOME. AT TIME OF THE ENCOUNTER I HAD ASSIGNED BOTH MYSELF AND THE S/O TFC WATCH. ALL OF OUR LIGHTS WERE ON PER COMPANY SOP. I FEEL THAT THESE LIGHTS, REQUIRED TO BE ON UNTIL REACHING 18000', HELPED TO PREVENT A MAJOR ACCIDENT AS DID THE NEW COMPANY SOP OF ASSIGNING A FORMAL TFC WATCH. SUPPLEMENTAL INFO FROM ACN 88802: LATER CHICAGO CENTER SUPVR INDICATED POSSIBLE CTLR ERROR AND THE OTHER ACFT WAS AN LTT. ESTIMATED CLOSEST SEP WAS 1200'.

Data retrieved from NASA's ASRS site as of August 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.