Narrative:

While awaiting departure for runway 27L at ord, tower xmissions were numerous and fast. Ord tower was controling arrs on runway 22L and departures on both runways 22L and 27L. We were cleared behind air carrier ab into position and hold on runway 27L. After responding, we reverified our clearance. Tower confirmed position and hold runway 27L, however his response was short and his voice irritated. We ran the checklist (before takeoff). We then heard clearance for air carrier clearance delivery (our flight), 'cleared for takeoff turn right heading 320 degrees.' I read the clearance back, and although we both thought the heading/turn sounded incorrect, the controller did not respond. After being rebuked for verifying our position and hold clearance, the controller also not responding or correcting our heading readback and due to the busy operations at the time, we did not reverify the 320 degree heading and took off, (altitude cleared us to was 5000 ft MSL). Upon contacting departure at approximately 2500 ft MSL and on a 320 degree heading, we received no response initially. We called again and blocked partially departure's transmission. We then received 'air carrier clearance delivery turn immediately to 180 degree heading, level at 4000 ft.' we complied. The 320 degree heading was taking us towards arrs on runway 14R and conflicting traffic. No TCASII warnings were observed and traffic conflicts were avoided. Both the captain and myself heard 'right turn, heading 320 degrees.' it was either broadcast in error, or received in error, we could not determine which.

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Original NASA ASRS Text

Title: FLC OF AN EMBRAER 145 FOLLOWED THE HEADING GIVEN BY THE ORD TWR CTLR AFTER TKOF AND WAS SUBSEQUENTLY GIVEN A 180 DEG TURN BY THE DEP CTLR SINCE THEY WERE HEADING TOWARD ARR TFC.

Narrative: WHILE AWAITING DEP FOR RWY 27L AT ORD, TWR XMISSIONS WERE NUMEROUS AND FAST. ORD TWR WAS CTLING ARRS ON RWY 22L AND DEPS ON BOTH RWYS 22L AND 27L. WE WERE CLRED BEHIND ACR AB INTO POS AND HOLD ON RWY 27L. AFTER RESPONDING, WE REVERIFIED OUR CLRNC. TWR CONFIRMED POS AND HOLD RWY 27L, HOWEVER HIS RESPONSE WAS SHORT AND HIS VOICE IRRITATED. WE RAN THE CHKLIST (BEFORE TKOF). WE THEN HEARD CLRNC FOR ACR CD (OUR FLT), 'CLRED FOR TKOF TURN R HDG 320 DEGS.' I READ THE CLRNC BACK, AND ALTHOUGH WE BOTH THOUGHT THE HEADING/TURN SOUNDED INCORRECT, THE CTLR DID NOT RESPOND. AFTER BEING REBUKED FOR VERIFYING OUR POS AND HOLD CLRNC, THE CTLR ALSO NOT RESPONDING OR CORRECTING OUR HEADING READBACK AND DUE TO THE BUSY OPS AT THE TIME, WE DID NOT REVERIFY THE 320 DEG HDG AND TOOK OFF, (ALT CLRED US TO WAS 5000 FT MSL). UPON CONTACTING DEP AT APPROX 2500 FT MSL AND ON A 320 DEG HDG, WE RECEIVED NO RESPONSE INITIALLY. WE CALLED AGAIN AND BLOCKED PARTIALLY DEP'S XMISSION. WE THEN RECEIVED 'ACR CD TURN IMMEDIATELY TO 180 DEG HDG, LEVEL AT 4000 FT.' WE COMPLIED. THE 320 DEG HDG WAS TAKING US TOWARDS ARRS ON RWY 14R AND CONFLICTING TFC. NO TCASII WARNINGS WERE OBSERVED AND TFC CONFLICTS WERE AVOIDED. BOTH THE CAPT AND MYSELF HEARD 'R TURN, HDG 320 DEGS.' IT WAS EITHER BROADCAST IN ERROR, OR RECEIVED IN ERROR, WE COULD NOT DETERMINE WHICH.

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.