C182 PILOT ENTERING RIGHT DOWNWIND FOR RWY 24 AT HYA REPORTS NMAC WITH C402 DEPARTING RWY 24.

Narrative

I TOOK OFF R TURN; DIRECT TO HYA AND CLBED TO 2700 FT; VFR -1200. AT 10 MI SW OF HYA (CLASS D) I CALLED IN A POS RPT OF 10 MI SW AND INFORMED TWR I WAS LNDG WITH CURRENT ATIS. I WAS INSTRUCTED TO ENTER A L BASE FOR RWY 24 AND CALL MIDFIELD. (I SENSED THERE WAS A TRAINEE IN THE TWR. I HEARD ANOTHER ACFT GIVEN INSTRUCTION TO ENTER A 'L BASE' FOR RWY 24 AS THAT ACFT WAS ARRIVING FROM THE SE.) I WAS THEN INSTRUCTED TO ENTER A 'R' DOWNWIND FOR RWY 24. I WAS STILL OUT FAR ENOUGH SO THAT WASN'T A PROB. I WAS DSNDING TO TPA OF 1100 FT (L DOWNWIND FOR RWY 24) AND JUST ARRIVED AT ALT IN THE PATTERN WHEN A CE402 JUST MISSED HITTING US AFTER DEPARTING RWY 24 AND GIVEN A R TURN. I CALLED THE TWR AND ASKED IF THEY HAD THAT TFC AS I NEVER HEARD A CALL AND THEY REPLIED IT WAS VFR AND NOW 10 NM N. I SAID I NEVER HEARD A CALL AND WHY WAS IT GIVEN A R TURN DIRECTLY INTO ME? AT THIS POINT A NEW CTLR STEPPED IN AND STATED THE PLANE WAS VFR. WHEN I TAXIED INTO THE FBO THE DESK MGR HEARD THE ENTIRE COM AND WAS AS CONCERNED AS I. I THEN CALLED THE TWR MGR AND HE TOLD ME THAT HE COULDN'T VERIFY THE INCIDENT AS THE TAPE WAS DOWN ALL DAY (HOW VERY CONVENIENT). THERE WERE 2 WITNESSES TO THIS INCIDENT. ONE WAS AT THE FBO WHO HEARD THE COM AND THE SECOND WAS MY PAX. WHAT I BELIEVE CAUSED THE PROB WAS A NEW CTLR/TRAINEE ISSUED INSTRUCTIONS TO THE DEPARTING C402 TO MAKE A R TURN AND LACKED AWARENESS OF MY POS ENTERING THE PATTERN. THE SECOND WAS THE CE402 PLT'S IRRESPONSIBILITY TO LOOKING AND AVOIDING TFC. WE SPOTTED HIM; TOO LATE FOR ANY EVASIVE ACTION; AS LUCKILY THE SEPARATION PREVENTED A MIDAIR. I MUST SAY; NOT BEING EASILY FRIGHTENED; I WAS SHOOK.