THE PF BECAME CONFUSED BTWN THE FLT PLANNED RTE; AND THE RTE THAT THE FLC WAS CLRED TO FLY. THIS ULTIMATELY LED TO LESS THAN LEGAL SEPARATION.

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AT XA50 THE PNF CONTACTED GND FOR ARPT INFO AND IFR CLRNC TO SBA. THE FILED RTE WAS 'EGE DIRECT DBL J-60 HEC DIRECT FIM DIRECT.' AFTER ALL CHKLIST ITEMS THE PNF REQUESTED AND RECEIVED TAXI CLRNC. DURING TAXI; WE WERE ADVISED OUR CLRNC WAS AVAILABLE; THE PNF COPIED IT. IT READ 'CLRED TO RLG VOR VIA IFR DEP PROC MAINTAIN 14000 FT; CONTACT DEN 134.5 OUT OF 10000 FT SQUAWK XXXX.' AFTER A REVIEW OF THE PROC BY BOTH PLTS; WE WERE CLRED FOR TKOF. THE TKOF AND INITIAL CLB WERE ROUTINE; THE PROB DEVELOPED AFTER LEAVING 10000 FT AND TURNING NBOUND ON THE 322 DEG RADIAL OF DBL. THE PNF WAS ATTEMPTING TO CONTACT DEN CTR WHEN I BECAME CONVINCED WE SHOULD GO 'TO' DBL. I TURNED SBOUND AND WE WERE LEVELING AT 14000 FT WHEN CONTACT WITH ZDV WAS ESTABLISHED. THE EVENTS AS I REMEMBER THEM WENT LIKE THIS: A FEMALE VOICE ASKED OUR POS AND ALT. A MALE VOICE CAME ON ADVISING US TO MAKE 'IMMEDIATE TURN N.' WE COMPLIED AND WERE ALSO ADVISED TFC 10 O'CLOCK AT 14300 FT. NO CREWMEMBER SAW ANY TFC. AFTER A BIT MORE CONFUSION; WE RECEIVED OUR ENRTE CLRNC PROCEEDING WITH NO MORE PROBS. AFTER A DISCUSSION WITH THE OTHER PLT; WE FEEL THE FACTORS AFFECTING OUR FLT WERE: 1) FILED RTE AND CLRED RTE WERE DIFFERENT. 2) RADIO WORK CAN BE DISTRACTING. WE BOTH AGREE THERE IS NO EXCUSE FOR THE 'DUMB AND DEADLY' WRONG TURN. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THAT SELF- IMPOSED TIME PRESSURE EXISTED FOR GULFSTREAM III FLC DURING DEP FROM EGE ARPT. THE RPTR WAS CONCERNED ABOUT FADING DAYLIGHT UNDER AN OVCST SKY. VISIBILITY WAS CRITICAL BECAUSE MOUNTAINOUS TERRAIN SURROUNDED THE ARPT; AND THERE WAS A HISTORY OF AN OCCASIONAL 'DEER ON THE RWY.' PRIOR TO DEP; THE FLC HAD REVIEWED THE IFR DEP PROC BUT; RPTR INDICATED THAT THE DETERIORATING CONDITIONS MAY HAVE INFLUENCED THE TIME AND ATTN DELEGATED TO THE TASK. ON CLBOUT; RPTR (PF) BECAME CONFUSED BTWN THE FLT PLANNED RTE AND THE ACTUAL ATC CLRNC RECEIVED. HE WANTED TO QUESTION THE PNF; BUT THE PNF WAS BUSY ESTABLISHING RADIO CONTACT WITH CTR. PUBLISHED PROC WAS IN FRONT OF PF (NOT THE NORM); BUT THIS WAS A HIGH WORKLOAD TIME AND HE DID NOT DIVERT HIS ATTN FROM FLYING THE ACFT. RPTR STATES THAT A SIMILAR SIT HAS HAPPENED BEFORE. RPTR FEELS THAT PNF NEEDS TO BE MORE ACTIVELY INVOLVED AND ASSERTIVE. RPTR; CLRLY; STILL TOOK RESPONSIBILITY FOR HIS MISTAKE; THOUGH.