NMAC ON APCH TO UNCTLED ARPT.

Narrative

THE INCIDENT OCCURRED DURING APCH TO LNDG WHILE I WAS FLYING SKYDIVERS IN TWIN OTTER. I ENTERED A 45 FOR THE L TFC RWY 34 AT YOLO ARPT. RWY 34 IS THE CALM WIND RWY AND THE WINDS WERE CALM. I HAD FLOWN THE SAME PATTERN 8 TIMES SO FAR TODAY. AS I TURNED ON THE 45 MY COPLT AND I NOTICED AN AIRPLANE THAT APPEARED TO BE IN A CLOSE-IN PATTERN TO 34. ALL ATTEMPTS TO CONTACT HIM BY RADIO FAILED SO I ENTERED A WIDE L DOWNWIND. AS I NEARED THE BASE TURN; I NOTICED THE AIRPLANE HAD NOT LANDED ON RWY 34 BUT 16. HE THEN MADE A TOUCH AND GO ON RWY 16 AND WAS COMING TOWARDS ME. WE BOTH SAW EACH OTHER AND HE MADE A R TURN AND PASSED BEHIND ME. SEEING THAT THERE WAS NO DANGER; I TURNED FINAL AND LANDED WITHOUT INCIDENT. I DID NOT KNOW IT AT THE TIME BUT HE TURNED BEHIND ME AND LANDED; CUTTING OFF ANOTHER AIRPLANE IN THE PATTERN. THE OWNER OF THE OTHER AIRPLANE CAME OVER TO ME AS I FUELED MY AIRPLANE AND TOLD ME I CUT HIM OFF IN THE PATTERN. I INFORMED HIM THAT RWY 34 WAS ACTIVE BUT HE DID NOT WANT TO LISTEN. A HEATED ARGUMENT ON HIS PART THEN ENSUED.