Near midair collision on approach to uncontrolled airport.

Attributes
ACN	284407
Time
Date	199409
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : 2q3
State Reference	CA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	other
Make Model Name	Twin Otter DHC-6
Operating Under FAR Part	Part 135
Flight Phase	descent : approach other
Flight Plan	None
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	descent : approach other
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : cfi pilot : atp
Experience	flight time last 90 days : 120 flight time total : 3020
ASRS Report	284407
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : nmac incursion : landing without clearance other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

The incident occurred during approach to landing while I was flying skydivers in twin otter. I entered a 45 for the left traffic runway 34 at yolo airport. Runway 34 is the calm wind runway and the winds were calm. I had flown the same pattern 8 times so far today. As I turned on the 45 my copilot 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 left downwind. As I neared the base turn, I noticed the airplane had not landed on runway 34 but 16. He then made a touch and go on runway 16 and was coming towards me. We both saw each other and he made a right 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 runway 34 was active but he did not want to listen. A heated argument on his part then ensued.

Original NASA ASRS Text

Title: 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.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.