ACR LGT CLBED WHEN THEY RECEIVED A TCASII RA. THEY WERE IN OR NEAR A CHARTED PARACHUTE JUMP ZONE.

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WE WERE DSNDING FROM 15000 FT TO 7000 FT WITH A CLRNC DIRECT TO TUS VOR. WE WERE ON THE 303 DEG RADIAL ABOUT 30 DME FROM THE FIELD WHEN WE SPOTTED A TWIN ENG ACFT AT OUR 11 O'CLOCK POS DOING RADICAL TURN MANEUVERS. WHILE PASSING THROUGH 8400 FT; WE RECEIVED A TCASII ADVISORY. AT 25 MI (STILL ON THE 303 DEG RADIAL) THE TWIN ENG ACFT TURNED HARD L AND THE TCASII ADVISORY CHANGED TO A TCASII RESOLUTION CALLING FOR A CLB (1500 FPM). WE INITIATED THE CLB LEVELING OFF AT 9200 FT AT WHICH TIME THE TCASII ALERT ENDED. APCH CTL THEN CLRED US TO 6000 FT AND REDUCE SPD TO 210. WE ADVISED APCH CTL OF THE TCASII RESOLUTION; WHICH HE ACKNOWLEDGED AND CLRED US TO 6000 FT AND 170 KTS. HE ALSO INDICATED HE HAD THE OTHER ACFT ON RADAR. (HE NEVER ADVISED US OF THE ACFT C). IT SEEMS THAT IF THIS ACFT WAS CLRED FOR THESE MANEUVERS; AND IF IT WAS IN CONTACT WITH APCH CTL; HE SHOULD NOT HAVE BEEN ALLOWED TO CONDUCT THEM RIGHT ON THE APCH CORRIDOR TO THE TUS ARPT (THE ACTIVE RWY AT THE TIME WAS 11L WITH THE LOC INBOUND COURSE BEING 123 DEGS). AFTER CALLING APCH CTL ON THE PHONE THE NEXT DAY; WE LEARNED THERE IS A JUMP STOP RIGHT THERE WHICH THEY HAVE BEEN UNSUCCESSFUL TO MOVE. THIS JUMP AREA IS COMPLETELY UNSAFE WAITING FOR AN ACCIDENT TO HAPPEN. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR CONFIRMED THAT THEY WERE ON THE 303 DEG RADIAL AND NOT ON THE 123 DEG RADIAL; '123 DEGS INBOUND.'