A PIPER CHEYENNE PIC PERFORMS A WRONG DIRECTION TURN OUT OF HPN AFTER BEING IMPROPERLY DIRECTED BY HIS FO.

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WE WERE DEPARTING RWY 16. CLRNC WAS FOR THE WESTCHESTER 9; PARKE INTXN; THEN AS FILED. MY COPLT BRIEFLY REVIEWED THE DEP AS I WAS TAXIING OUT AND DOING THE TAXI CHKLIST. HE BRIEFED ME ON THE DEP. I DID NOT ACTUALLY READ IT. WE DEPARTED ON THE RWY HDG; AND AS I WAS CLBING; WAITING FOR A VECTOR; WE PASSED THROUGH 1000 FT MSL. I ASKED MY COPLT TO CONFIRM THE HDG OF 320 DEGS. HE CONFIRMED; AND I STARTED A R TURN. HE THEN SAID 'NO; IT IS A L TURN; AWAY FROM LGA.' I THEN STARTED THE L TURN. ATC THEN ASKED IF WE WERE ON THE DEP; AND SAID; 'I SEE A L TURN; TURN L TO 290 DEGS; YOU SHOULD HAVE MADE A R TURN.' THE 'RUSH' OF DEPARTING NEW YORK; AND THE BUSY ARPT CAUSED ME NOT TO REVIEW THE PROC. CRM WITH 2 PLTS FLYING WORKS ONLY IF BOTH PLTS KNOW WHAT IS GOING TO HAPPEN; AND AGREE ON IT. I RELIED ON MY COPLT TO READ THE DEP; AND BECAUSE I DID NOT; HE WAS IN EFFECT; A SINGLE PLT. 2 THOUGHTS: 1) EMPHASIZE THAT A PLT MUST MAKE TIME TO UNDERSTAND THE PROC IN QUESTION. IF IT MEANS DELAYING THE DEP; SO BE IT. 2) EMPHASIZE 'PROPER' 2 PLT PROCS. THIS IS FOR PART 91; 135; 121 PEOPLE. TRAINING SHOULD INCLUDE CRM FOR ALL PLTS WITH A COMMERCIAL TICKET AND SHOULD BE INCLUDED IN THE CFI. THIS TRAINING SHOULD INCLUDE NOT ONLY THE PF/PNF CONCEPT; BUT CHALLENGE AND RESPONSE AS WELL. THERE WERE NO MISHAPS; ACCIDENTS OR TFC CONFLICTS THIS TIME.