Narrative:

On departure roll, the first officer had the heading bug set up for a right turn, which seemed unusual. I asked if the tower asked for a right turn. He replied yes to 240 degrees. Still skeptical, on initial climb out, I announced our intended turn and altitude we were climbing to. Without an immediate reply the first officer started the turn only to be quickly queried by an alarmed controller who then issued a left turn. I don't know where the 240 degree heading came from (I didn't hear it), but I should have verified it with the tower. As competent as the person you are flying with is, sometimes ATC instructions are misinterped. If only 1 pilot is unsure, it is not enough to verify with the other. Verify with ATC.

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Original NASA ASRS Text

Title: FO OF AN EMBRAER EMB145 (E145) STARTED TURNING THE WRONG WAY AFTER TKOF RESULTING IN ATC INTERVENTION TO IMMEDIATELY TURN RPTR'S ACFT THE OPPOSITE DIRECTION.

Narrative: ON DEP ROLL, THE FO HAD THE HDG BUG SET UP FOR A R TURN, WHICH SEEMED UNUSUAL. I ASKED IF THE TWR ASKED FOR A R TURN. HE REPLIED YES TO 240 DEGS. STILL SKEPTICAL, ON INITIAL CLBOUT, I ANNOUNCED OUR INTENDED TURN AND ALT WE WERE CLBING TO. WITHOUT AN IMMEDIATE REPLY THE FO STARTED THE TURN ONLY TO BE QUICKLY QUERIED BY AN ALARMED CTLR WHO THEN ISSUED A L TURN. I DON'T KNOW WHERE THE 240 DEG HDG CAME FROM (I DIDN'T HEAR IT), BUT I SHOULD HAVE VERIFIED IT WITH THE TWR. AS COMPETENT AS THE PERSON YOU ARE FLYING WITH IS, SOMETIMES ATC INSTRUCTIONS ARE MISINTERPED. IF ONLY 1 PLT IS UNSURE, IT IS NOT ENOUGH TO VERIFY WITH THE OTHER. VERIFY WITH ATC.

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.