AN ACR LGT WAS CLRED FOR A VISUAL APCH TO RWY 11L AT TUS AND GIVEN TFC; A CESSNA ON A VISUAL APCH TO RWY 11R. THE ACR HAD THE CESSNA IN SIGHT; BUT SAW IT APPARENTLY HEADED FOR RWY 11L AND THE ACR MADE A GAR; BUT HAD AN NMAC WHILE DOING SO. ACFT WERE ON DIFFERENT FREQS.

Narrative

WE HAD BEEN CLRED FOR A VISUAL APCH TO RWY 11L AT TUCSON. WE WERE USING THE ILS AS A BACKUP TO THE VISUAL AND WERE SHOWING ON COURSE AND ON GS. TWR HAD CALLED OUT TFC AS A CESSNA ON A VISUAL APCH TO RWY 11R. WE SAW HIM AND HE SEEMED TO BE ON A R DOG-LEG TO RWY 11R. HE WAS AHEAD OF US AND TO THE R. WHEN HE TURNED FINAL; WE NOTICED HE SEEMED TO BE OVERSHOOTING FINAL. THE RWYS ARE ONLY SEPARATED BY 700 FT. THEN WE REALIZED HE WAS ROLLING OUT TO LINE UP ON RWY 11L. WE TURNED L AND DSNDED TO EVADE AS HE WAS STILL SLIGHTLY ABOVE OUR ALT. AFTER PASSING HIM WE EXECUTED A MISSED APCH. I ESTIMATE WE PASSED 200 FT L AND 50 FT BELOW HIM. LATER TWR SAID THE CESSNA HAD BEEN ON A STRAIGHT-IN APCH TO RWY 11L; BUT OUR OVERTAKE WOULD HAVE HAD US PASS HIM ON FINAL. DUE TO WAKE TURB; THIS IS AGAINST TWR'S PROC. TO PREVENT THIS; THEY TURNED HIM OUT TO THE W; THEN BACK ON THE DOG-LEG. BUT WHEN HE TURNED FINAL HE WAS STILL AHEAD OF US; ONLY NOW MUCH CLOSER. OUR OVERTAKE HAD TO HAVE BEEN 60-70 KTS. THE CESSNA WAS BEING WORKED ON ANOTHER FREQ SO WE COULD NOT HEAR WHAT WAS SAID TO HIM; OR EVEN WARN HIM OURSELVES. THE RWYS ARE CLOSE AND RWY 11R IS SMALL AND DOES NOT STAND OUT FROM THE TXWYS. I THINK THE CESSNA PLT EITHER GOT DISORIENTED DURING THE TURNS; OR JUST LOCKED ON VISUALLY TO THE MORE VISIBLE RWY. THE CTLR SEEMS TO HAVE MISJUDGED THE TIMING REQUIRED TO LET US PASS WHILE THE CESSNA WAS TURNED OUT. WE DID SLOW FROM ABOUT 200 KTS TO 135 KTS ON FINAL. MAYBE HE DIDN'T EXPECT THAT MUCH DIFFERENCE. F16'S WERE DOING PATTERNS AND MAYBE HE WAS USING THEIR SPDS TO FIGURE THE TIME REQUIRED. WE FULLY EXPECTED THAT THE CESSNA WOULD REALIZE HIS OVERSHOOT AND CONTINUE TURNING R TO RE- INTERCEPT FINAL FOR RWY 11R. BY THE TIME WE REALIZED HE WAS GOING FOR RWY 11L; WE LOST A COUPLE OF SECONDS BEFORE REACTING. WITH THE RWYS THAT CLOSE TOGETHER; AS SOON AS WE SAW HIM OVERSHOOT; WE SHOULD HAVE STARTED OUR GAR.