PLT OF SMA HAS NMAC IN TFC PATTERN AT SEZ.

Narrative

NUMEROUS ARRS AND DEPS WERE IN PROGRESS AT SEDONA ARPT; TKOFS ON RWY 21 AND ARRS ON RWY 3 WITH L-HAND TFC TO BOTH RWYS -- A NORMAL SUNDAY MORNING. A CESSNA CITATION RPTED IN ON UNICOM AS 15 MI NE ENTERING ON THE 45 DEGS TO RWY 3. A T6 RPTED IN 7 MI SW ENTERING FOR THE 360 DEGS OVERHEAD TO RWY 3. A CESSNA SINGLE RPTED 4 MI SE FOR ENTRY TO LAND RWY 3. I RPTED 6 MI NW FOR ENTRY ON THE 45 DEGS TO DOWNWIND TO RWY 3. GND PERSONNEL ON THE SEDONA RAMP WERE INITIATING CALLS TO ACFT ON THE GND ABOUT PARKING; WHICH TOOK UP FREQ TIME FROM ACFT TRYING TO MAKE POS RPTS. THERE WERE SEVERAL BLOCKED RADIO CALLS. I SAW THE CITATION ENTER FROM NE STRAIGHT INTO DOWNWIND AHEAD OF ME; NOT ON THE 45 DEGS AS HAD BEEN ANNOUNCED; BUT ONCE ON DOWNWIND THE PLT RPTED APPROPRIATE POS. I SAW THE T6 ENTERING ON THE 360 DEGS OVERHEAD AND TALKED WITH HIM ABOUT PATTERN SPACING FOR MY ENTRY ON THE 45 DEGS. I DID NOT SEE THE CESSNA SINGLE WHO HAD BEEN ENTERING FROM THE SE (WHICH MEANT THE ACFT WAS COMING STRAIGHT AT ME AND THE ARPT OUT OF THE MORNING SUN); AND DID NOT HEAR ANY RADIO CALLS FROM THAT ACFT AFTER ITS INITIAL RPT. AS I TURNED FROM 45 DEG ENTRY ONTO DOWNWIND; THE T6 PLT SAW THE CESSNA SINGLE TURNING INTO ME (HIS HIGH WING; WING DOWN -- MY LOW WING; WING UP) AND BROADCASTED A WARNING TO ME. THE CESSNA SINGLE HAD NOT ENTERED ON A PATTERN LEG; BUT HAD FLOWN DIRECTLY ACROSS MIDFIELD AT PATTERN ALT ON A HEADING OF ABOUT 340 DEGS STRAIGHT INTO THE 45 DEG ENTRY (STRAIGHT INTO ME) AND THEN STARTED A L 135 DEG TURN TO DOWNWIND. WARNED; I LEVELED MY WINGS AND SAW THE CESSNA SINGLE; THEN CONTINUED MY TURN AND AVOIDED HIM. WE CAME OUT OF OUR TURNS ABOUT 2000 FT APART; SAME ALT; WITH ME ABOUT 500 FT BEHIND HIM. THE GND PERSONNEL CONTINUED MAKING RADIO CALLS ABOUT PARKING WHILE THE 3 ACFT IN THE PATTERN AND THE TWO TAKING OFF WERE TRYING TO SEQUENCE THEMSELVES FOR TFC AVOIDANCE. I REQUESTED THE GND PERSONNEL STOP XMITTING WHILE THE ACFT SORTED OUT THE PATTERN PROBS. THEY DID NOT; SO I LEFT THE PATTERN AND REENTERED; AS DID THE T6 BEHIND ME. WHEN THE GND PERSONNEL FINALLY QUIETED DOWN; WE CAME BACK. THIS INCIDENT IS THE RESULT OF 2 LONG-STANDING PROBS AT SEDONA ARPT. FIRST; PLTS DO NOT FLY STANDARD AIM TFC PATTERN ENTRIES FOR THIS ARPT. IF THE CESSNA SINGLE PLT HAD ENTERED THE PATTERN AS DEPICTED IN THE AIM; OR ENTERED ON XWIND RATHER THAN FLYING RIGHT ACROSS THE ARPT AT PATTERN ALT DIRECTLY INTO THE ONCOMING TFC FROM THE 45 DEG ENTRY; THERE WOULD HAVE BEEN NO CONFLICT. SECOND; SEDONA'S GND PERSONNEL RADIO XMISSIONS ABOUT PARKING AND FUELING CONTINUE TO INTERFERE WITH ACFT COMS WHILE PLTS ARE TRYING TO WORK AROUND THE FIRST PROB. IN THIS CASE; I DON'T THINK WE WOULD HAVE COLLIDED WITHOUT THE T6 RADIO WARNING; BUT I'M NOT SURE. IN THE NEXT CASE; WE MAY NOT BE SO LUCKY. I'VE FLOWN AT SEDONA FOR MANY YRS; ALWAYS FLY VERY CAUTIOUSLY WHILE PRETENDING NOBODY HAS A RADIO; AND HOPE FOR THE BEST. WHAT WILL IT TAKE TO MAKE PEOPLE FLY 'BY THE BOOK' AND SHUT UP IF THEY AREN'T TALKING ABOUT ACFT SAFETY? ALUMINUM RAIN?