NON RESPONSE TO ATTEMPTED CRM WHEN A CARJ PIC EXPERIENCES A HDG TRACK DEV ON THE SKEBR RNAV 2 ARR WHEN SKEBR IS DROPPED OUT OF THE DISPLAY AFTER A RWY CHANGE INTO LAS; NV.

Narrative

WE WERE DSNDING ON THE SKEBR RNAV 2 ARR INTO LAS VEGAS. THE CAPT WAS THE PF AND HAD PROGRAMMED THE FMS PRIOR TO DEPARTING. IN THE PAST; WE HAD ALWAYS FLOWN A DIFFERENT ARR AND HAD ALMOST ALWAYS LANDED ON RWY 19L; SO HE HAD RWY 19L PROGRAMMED IN THE FMS AS THE LNDG RWY. APPROX OVER CLARR INTXN; THE APCH CTLR ADVISED US TO EXPECT RWY 25L (THE RWY THAT THE SKEBR ARR APPEARED TO BE DESIGNED FOR). THE CAPT THEN ENTERED THE NEW RWY INTO THE FMS AND HIT THE 'EXECUTE' BUTTON. I NOTICED THAT SKEBR INTXN DROPPED FROM THE DISPLAY AND THE AUTOPLT BEGAN A TURN APPROX 35 DEGS L DIRECT TO KEPEC INTXN. I THEN STATED; 'SKEBR INTXN JUST DROPPED OUT OF THE FMS.' THE CAPT BEGAN TO STUDY HIS ARR PLATE AND IT APPEARED THAT HE HAD LOST HIS SITUATIONAL AWARENESS. I THEN POINTED IN THE DIRECTION WE WERE ORIGINALLY HEADING AND SAID; 'LET'S JUST HEAD BACK IN THAT DIRECTION UNTIL WE GET SKEBR PLUGGED BACK IN.' THE CAPT SAID NOTHING AND CONTINUED TO STUDY HIS ARR PLATE. DISMAYED; I THEN SAID; 'WE ARE GOING TO GET YELLED AT IF WE DON'T GET BACK ON COURSE!' THE CAPT THEN SLOWLY BEGAN TO TYPE SKEBR INTO THE FMS KEYPAD. I SAID; 'LET'S JUST GO HEADING MODE IN THAT DIRECTION WHILE YOU PLUG THAT IN ...' TO NO RESPONSE. THEN THE CTLR ASKED US WHERE WE WERE HEADING. I SAID THAT SKEBR INTXN SOMEHOW GOT DUMPED OUT WHEN WE CHANGED RWYS ON THE FMS. SHE THEN TOLD US TO GO DIRECTLY TO SKEBR AND RESUME THE ARR. THE CAPT FINALLY HAD TYPED IT IN AND HIT THE 'EXECUTE' BUTTON AND THE DISPLAY SHOWED US TO THE W OF SKEBR. THE CTLR THEN ASKED ME TO CALL WHEN WE LANDED. I BELIEVE THAT THIS ENTIRE SCENARIO WAS A GOOD EXAMPLE OF POOR CRM. THE CAPT SEEMED TO BE OBLIVIOUS TO MY CONCERN THAT WE WERE HEADING OFF COURSE AND DIDN'T HEED MY SUGGESTIONS. I SHOULD HAVE IMMEDIATELY NOTIFIED THE CTLR THAT WE HAD LOST THE FIX ON OUR FMS AND ASKED FOR A VECTOR. GOOD COM WOULD HAVE CURED THE PROB QUICKLY.