Narrative:

The first officer was the PF and the flight ewr-mem was cleared to depart via the arthur kill SID from ewr. Upon reaching 2.3 DME I began a turn to 260 degrees but the captain insisted I roll out on a 220 degree heading. I complied. The departure controller asked if we were 'flying the SID today or what?' the captain had looked at the wrong SID for the heading. There was no conflict with other aircraft and the flight progressed normally. As a result of this occurrence, I plan to thoroughly brief the SID prior to takeoff or as part of the clearance.

Google
 

Original NASA ASRS Text

Title: DC9 ACFT ON SID DEP AND PF FO STARTED A TURN IN COMPLIANCE WITH THE SID WHEN THE CAPT INSISTED THE FO TURN BACK TO RWY HDG. DEP CTLR INTERVENED AND STRAIGHTENED OUT THE CONFUSION.

Narrative: THE FO WAS THE PF AND THE FLT EWR-MEM WAS CLRED TO DEPART VIA THE ARTHUR KILL SID FROM EWR. UPON REACHING 2.3 DME I BEGAN A TURN TO 260 DEGS BUT THE CAPT INSISTED I ROLL OUT ON A 220 DEG HDG. I COMPLIED. THE DEP CTLR ASKED IF WE WERE 'FLYING THE SID TODAY OR WHAT?' THE CAPT HAD LOOKED AT THE WRONG SID FOR THE HDG. THERE WAS NO CONFLICT WITH OTHER ACFT AND THE FLT PROGRESSED NORMALLY. AS A RESULT OF THIS OCCURRENCE, I PLAN TO THOROUGHLY BRIEF THE SID PRIOR TO TKOF OR AS PART OF THE CLRNC.

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.