C208 COLLIDES WITH A C172 ON FINAL TO ZZZ.

Narrative

OUR CARAVAN 208 COLLIDED WITH A CESSNA 172 ON SHORT FINAL TO AN UNCTLED ARPT RWY; AT APPROX 150 FT AGL. I WAS RETURNING FROM A SKYDIVE DROP FROM 13500 FT MSL; WAS IN CONTACT WITH APCH CTL ON OUR ASSIGNED DISCRETE XPONDER CODE UNTIL I SIGNED OFF FROM APCH AT ABOUT 3500 FT MSL. I JOINED THE DOWNWIND; FLEW A BASE AND FINAL MAKING BROADCASTS ON POS AND INTENTION AT EACH LEG. I HAD A VISUAL ON A PIPER PAWNEE GLIDER TOW PLANE ENTERING THE DOWNWIND FROM UPWIND AND COMMUNICATED WITH HIM MY POS AND FLT PATH. NO OTHER ACFT MADE RADIO CALLS ON THE FREQ WHILE I WAS MONITORING DURING MY APCH. MY GPS RECEIVES TFC DISPLAY FROM OUR GPS DATALINK MODE S XPONDER. WHILE THERE WERE MULTIPLE TARGETS IN THE VICINITY; NO TARGETS APPEARED ON THE FINAL APCH PATH TO RWY 36 AS I MADE MY BASE; AND BASE TO FINAL TURNS. COLLISION IMPACT OCCURRED AT APPROX 150 FT AGL ON SHORT FINAL TO RWY 36. WIND WAS 20-25 KTS FROM 360 DEGS. BOTH ACFT WERE ABLE TO LAND IMMEDIATELY AFTER THE COLLISION WITH MINOR DAMAGE TO BOTH ACFT; NO INJURIES. I FEEL THAT THE OTHER ACFT HAD ESTABLISHED A WIDE TFC PATTERN TO THE ARPT; AS HE STATED THAT HE HAD CALLED A 1 MI FINAL RADIO CALL. SINCE I NEVER HEARD THIS CALL; AND HE DID NOT RESPOND TO MY CALLS; EITHER HE WAS BROADCASTING ON THE WRONG FREQ OR WAS DISTR BY HIS STUDENT; POSSIBLY GIVING INSTRUCTION. THIS PUT HIM BELOW MY TFC INFO DISPLAY AND BELOW MY OPTICAL SCAN MIXING IN WITH TERRAIN VISUALLY. I DO NOT KNOW WHY HE DID NOT OBSERVE A CARAVAN ON BASE AND FINAL; OR WHY HE DID NOT RESPOND TO MY RADIO CALLS. A WITNESS; A GLIDER SCHOOL INSTRUCTOR ATP/CFI ON THE GND CLOSE TO THE LNDG RWY SAID MY DOWNWIND; APCH; AND FINAL LOOKED LIKE A NORMAL APCH. HE DID NOT OBSERVE THE CESSNA 172 BELOW ME UNTIL AFTER THE COLLISION TOOK PLACE. I FLY APPROX 150 PLUS APCHS TO THE ARPT MONTHLY. I FREQUENTLY SEE ACFT FLY DOWNWIND AND BASE LEGS TO FINAL OVER 2 1/2 TO 3 MI AWAY FROM THE ARPT; WHICH I CONSIDER UNSAFE FOR ENG FAILURE AND VISIBILITY REASONS. MOST OF THESE WIDE PATTERNS ARE FLOWN BY FLT SCHOOL ACFT THAT COME FROM NEARBY ARPT; WHICH ARE LARGER WITH A CLASS D CTL TWR OP AIRSPACE. THEY ARE USED TO LARGE WIDE TFC PATTERNS TO A MUCH LARGER ARPT WITH TWR ASSISTED TFC SEPARATION.