NMAC -- RADIO COM PROC -- TFC PATTERN PROC -- THIS INSTRUCTOR BECAME ENGROSSED IN A CRITIQUE OF HIS STUDENT AND MISSED SEVERAL REQUIRED RADIO CALLS AND PROCS AND HAD A NMAC IN THE PATTERN.

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I DIDN'T MAKE A RADIO CALL TO TWR ON DOWNWIND; I WAS DISTRACTED BY MY STUDENT AND ME TALKING. MY STUDENT DID A TOUCH AND GO ON RWY 3L AND A BRASILIA COMMUTER TWIN ENG AIRPLANE TOOK OFF ON RWY 30. DURING CLBOUT I WAS LOOKING FOR A PEN IN MY FLT BAG. WHEN I TURNED AROUND I SAW THE BRASILIA TO OUR R; CLBING. TO AVOID A COLLISION I TOOK CTL OF THE AIRPLANE AND BANKED HARD TO THE R. I LEVELED THE AIRPLANE WINGS THEN CONTINUED THE CLBOUT TO PATTERN ALT. I THEN REQUESTED A FULL STOP AND LANDED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: THE INSTRUCTOR PLT SAID THAT HE WAS FLYING A BEECH SKIPPER WITH A NEW STUDENT WHO WAS HAVING TROUBLE WITH LNDG. HE WAS CRITICIZING THE PREVIOUS LNDG WHILE ON DOWNWIND WHEN THE SEQUENCE OF EXCITING EVENTS BEGAN. AFTER MISSING THE DOWNWIND CALL THE INSTRUCTOR THEN ALLOWED THE STUDENT TO LAND WITHOUT A CLRNC THEN THEY CONTINUED WITH A TOUCH AND GO. THE NMAC OCCURRED DURING THIS MANEUVER. THEN THE INSTRUCTOR TOOK THE ACFT AND COMPLETED THE PATTERN IN CONTACT WITH THE TWR AND LANDED. THE FAA INVESTIGATORS TOLD THE INSTRUCTOR THAT THE ATCT LCL CTLR WAS DISTRACTED BY OTHER TFC AND DID NOT SEE HIM TURN FINAL OR LAND. THE BRASILIA'S TKOF CLRNC WAS GIVEN WHILE THE INSTRUCTOR'S ACFT WAS ON SHORT FINAL APPARENTLY; BUT THE INSTRUCTOR DOES NOT REMEMBER HEARING THE XMISSION. THE FAA HAS SUSPENDED THE INSTRUCTOR'S PRIVILEGES FOR 30 DAYS.