A C400 CPR FLC STARTS A TURN TO 090 DEGS IN THE WRONG DIRECTION WHEN DEPARTING SW OF MDW; IL.

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OUR DEP CLRNC WAS R TURN TO 090 DEGS UP TO 3000 FT. PLAYBACK OF TWR TAPE VERIFIES MY COPLT READING IT BACK. I WAS THE PF AND DIDN'T HEAR R TURN (OR IT DIDN'T REGISTER). I TOOK OFF. I HAD 090 DEGS BUGGED ON MY HSI; WHICH IS AN EFIS (AMS 5000 SYS). I SAW 090 DEGS JUST TO MY L AND BEGAN THE TURN. TWR NOTICED MIDWAY THROUGH THE TURN AND TOLD US TO TURN R. THERE WAS DEPARTING TFC BEHIND US; BUT NO CONFLICT AROSE. I PHONED THE TWR TO DISCUSS WHAT HAPPENED. I SPOKE TO THE WATCH SUPVR AT MIDWAY. HE SAID THIS HAPPENS TWICE A WK AT MIDWAY; EVEN WHEN READ BACK. IT IS SIMPLY HUMAN ERROR. FROM A 220 DEG HDG; A TURN TO 090 DEGS IS IN SIGHT ON THE HSI TO THE L. MAYBE FROM TRAINING REGIMENT WE PLTS HAVE THE TENDENCY TO TURN IN THE SHORTER DIRECTION. ALSO CRM WAS A FACTOR. MY COPLT WAS ON THE RADIOS; HE COPIED THE CLRNC AND READ IT BACK. I WAS ON ANOTHER TASK AT THE MOMENT; AND HEARD 090 DEGS BUT NOT R TURN; AND MY COPLT HAD SIMPLY FORGOT AND DID NOT CATCH IT EITHER. AGAIN THIS STRESSES THE IMPORTANCE OF CRM; READBACKS AND CLRNC VERIFICATION.