CREW HAS DISAGREEMENT MOMENTARILY ABOUT ROUTING ON ARR TO DAL; TX; RESULTING IN FLT OFF TRACK.

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TERMINATION OF A 4-HR COMPLETION TEST FLT. 13 1/2 HRS INTO PIC'S CREW DAY; WITH NON TEST PLT/CONSULTANT PLT IN R SEAT. ASSIGNED 5000 FT; PASSING 8000 FT; FROM PREVIOUSLY ASSIGNED 11000 FT ALT AT 210 KIAS ASSIGNED AIRSPD ON GLEN ROSE 5 ARR FOR DALLAS LOVE FIELD. ACFT WAS COUPLED TO AUTOPLT FLYING THE ARR IN FMS MODE AND WAS TURNING TO INTERCEPT THE 064 DEG RADIAL OUTBOUND FROM FUZ. I HAD REVIEWED THE PROC FROM THE DATABASE; COMPARING IT WITH THE PAPER NOAA CHART AND THOUGHT THIS TURN TO BE REASONABLE. COPLT ANNOUNCED 'WHERE ARE YOU GOING?' TO WHICH I RESPONDED 'FOLLOWING THE ARR.' HE INSTRUCTED 'NO; TURN TO THE 030 DEG RADIAL; NO; I MEAN 351 DEG HDG.' IN THAT HE WAS NAVING; HAD THE ARR IN HIS HANDS AND WAS THE FORMER CHIEF PLT OF AN ORGANIZATION BASED AT LOVE FIELD AND HAD FLOWN IN THIS TERMINAL AREA FOR 30 YRS; I COMPLIED; BUT QUICKLY REFED MY CHART; SAW THAT I WAS RIGHT AND AGAIN TURNED TO INTERCEPT THE FUZ 064 DEG RADIAL. BY THIS TIME WE WERE N OF COURSE BECAUSE OF A STRONG WIND FROM THE S (ABOUT 1/2 SCALE DEFECTION) AND ATC ASKED IF WE WERE TURNING TO INTERCEPT THE RADIAL. WE RESPONDED THAT WE WERE. ATC INSTRUCTED US TO REINTERCEPT MORE QUICKLY AS WE WERE 'WELL N' OF COURSE. AT THIS POINT I DISCONNECTED THE AUTOPLT; ROLLED THE ACFT INTO A STEEPER BANK AND TURNED TO A 30 DEG INTERCEPT HDG. I QUICKLY CTRED THE COURSE NEEDLES AND FORT WORTH HANDED ME OFF TO REGIONAL APCH CTL FOR LNDG AT DALLAS LOVE. COPLT WAS PAST 60; RETIRED CHIEF PLT; STRONGLY OPINIONATED AND HARD OF HEARING. I HAD LITTLE CONFIDENCE IN HIM; IN THAT ON TKOF; I HAD COMMANDED 'GEAR UP; FLAPS UP' WHILE I MAINTAINED OUTSIDE VIGILANCE IN THE TERMINAL AREA. I HEARD THE GEAR COME UP; BUT NOTICED; BY THE AUTOSPD COMMANDED BY THE AUTOPLT; THAT HE HAD NOT RETRACTED THE FLAPS; SO I DID IT MYSELF. SUBSEQUENTLY; I HAD NOT USED HIM MUCH ON THE FLT. THIS HE HAD COMPLAINED ABOUT. SO; IN THE TERMINAL AREA; I HAD ALLOWED HIM TO SELECT THE ROUTING WHICH WE FLEW TO THE STAR AND PROGRAM AND SELECT THE ARR TO BE FLOWN. THUS; THE ARR WAS HIS RESPONSIBILITY AND I WAS PURPOSELY ALLOWING HIM TO DEMONSTRATE HIS DALLAS AREA EXPERTISE; IN PART TO MAKE UP FOR MARGINALIZING HIM EARLIER IN THE FLT. IT WAS FOR THIS REASON THAT I DEFERRED TO HIM (AND GOOD CRM PRACTICES) WHEN HE INSTRUCTED THE WRONG TURN OVER FUZ. IT WAS A MISTAKE; THERE WAS NO CONFLICT; I WAS LUCKY.