MD80 FOREIGN ACR CREW WAS GIVEN AN RNAV ARR TO LAS WHEN THE ACFT WAS NOT RNAV EQUIPPED. THE CREW INFORMED ATC THE ACFT WAS NOT EQUIPPED.

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DURING OUR APCH TO LAS IN CONTACT WITH ZLA; WE WERE CLRED TO IGM VORTAC. THEN IN CONTACT WITH LDS APCH; WE WERE CLRED TO THE MIROK 1 ARR. -- DURING OUR APCH BRIEFING; WE MADE A MIROK 1 ARR TRANSITION TO ILS RWY 25L BRIEFING; AND WE MADE A COORD THAT ONLY WE WERE CAPABLE TO ACCEPT A VORTAC ARR TO LAS DUE TO THE ACFT EQUIP (TACAN ONLY/P=XPONDER WITH MODEC). -- THEN WITH ALL SET TO MAKE THE APCH; WE WERE CLRED TO LAS VEGAS VIA THE LYNSY RNAV 2 ARR; AND WE WERE CLRED TO LYNSY INTXN; WE REQUESTED A HDG TO ATC TO PROCEED TO LYNSY INTL. -- WHEN WE GOT THE APCH PLATE; WE ESTABLISHED THAT WE WERE UNABLE TO COMPLY WITH THAT APCH. AFTER COORDINATING THAT; WE MADE A STATEMENT TO APCH CTL THAT WE WERE ONLY TACAN EQUIP. -- AFTER THAT; WE WERE STILL CLRED TO LYNSY INTXN; AND TO CROSS IT AT 12000 FT AS WE WERE CHANGING CHARTS; TRYING TO ESTABLISH A POS AWARENESS; WE BEGAN TO BE HIGH DURING OUR DSCNT PROFILE TO CROSS LYNSY AT 12000 FT. SO; WE INCREASED OUR RATE OF DSCNT TO 3500 FPM. -- FINALLY; WE RECEIVED 'VECTORS' TO INTERCEPT THE ILS RWY 25L FINAL APCH COURSE; AND THE FLT WAS COMPLETED. -- I BELIEVE THAT THESE KINDS OF MISUNDERSTANDINGS CAN BE AVOIDED TRYING TO: 1) KNOW EXACTLY WHAT KIND OF EQUIP; BASED ON THE FLT PLAN SUFFIX; THE ACFT APCHING HAS. 2) AVOID CHANGES ON THE APCH ARR; ETC; WHEN THE COCKPIT AND ATC WORKLOADS ARE CRITICAL. 3) BECAUSE I WAS THE PNF; I THINK THAT I WAS ABLE TO USE INSTEAD OF 'WE WERE TACAN ONLY EQUIP; THE WORDS 'UNABLE TO COMPLY WITH LYNSY ARR.'