Narrative:

While en route between centralia (enl) and iowa city (iow), we were directed by ATC to turn 20 degrees left. The first officer inadvertently commenced a turn to the right. ATC saw this and directed an immediate turn to the left and a descent to FL290. Shortly thereafter, we were cleared back on course and cleared to climb back to FL310. The controller queried as to his original instruction and we confirmed that it was a 20 degree turn to the left. A possible contributing factor to this event may have been fatigue. Our wake-up calls that morning were at approximately XA15.

Google
 

Original NASA ASRS Text

Title: B727 FLC TURN WRONG DIRECTION THAN ASSIGNED BY ZKC.

Narrative: WHILE ENRTE BTWN CENTRALIA (ENL) AND IOWA CITY (IOW), WE WERE DIRECTED BY ATC TO TURN 20 DEGS L. THE FO INADVERTENTLY COMMENCED A TURN TO THE R. ATC SAW THIS AND DIRECTED AN IMMEDIATE TURN TO THE L AND A DSCNT TO FL290. SHORTLY THEREAFTER, WE WERE CLRED BACK ON COURSE AND CLRED TO CLB BACK TO FL310. THE CTLR QUERIED AS TO HIS ORIGINAL INSTRUCTION AND WE CONFIRMED THAT IT WAS A 20 DEG TURN TO THE L. A POSSIBLE CONTRIBUTING FACTOR TO THIS EVENT MAY HAVE BEEN FATIGUE. OUR WAKE-UP CALLS THAT MORNING WERE AT APPROX XA15.

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.