Narrative:

I was flying into osh for the airventure event and was on downwind for runway 27. We were monitoring the tower frequency. There were at least two planes on final and a plane in front of me that had just turned base. The spacing was too tight even for an osh arrival. This was my 5th osh airventure arrival. I decided to extend downwind. There was no ATC communication at that time (that we could hear). I decided to extend downwind to keep safe spacing when two planes popped down out of the clouds to the east on a final approach. They were 'hell bent' on their approach and did not seem to see me or try to avoid me on final. To keep clear; I immediately initiated a left 360-degree turn. As I came around the turn; another plane slipped in front of me to turn base to final. Still there was no ATC chatter. I landed tight behind the low wing aircraft that had turned in front of me (still no tower chatter). A dreadful dereliction of duty by the FAA controllers. My landing was safe and in control; but all in all; my worst osh arrival. My radio has operating fine and did on all frequencies going to and from osh.

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Original NASA ASRS Text

Title: Experimental Homebuilt pilot described close proximity traffic in landing pattern at KOSH Airventure fly-in with no apparent ATC control.

Narrative: I was flying into OSH for the Airventure event and was on downwind for Runway 27. We were monitoring the Tower frequency. There were at least two planes on final and a plane in front of me that had just turned base. The spacing was too tight even for an OSH arrival. This was my 5th OSH Airventure arrival. I decided to extend downwind. There was no ATC communication at that time (that we could hear). I decided to extend downwind to keep safe spacing when two planes popped down out of the clouds to the east on a final approach. They were 'hell bent' on their approach and did not seem to see me or try to avoid me on final. To keep clear; I immediately initiated a left 360-degree turn. As I came around the turn; another plane slipped in front of me to turn base to final. Still there was no ATC chatter. I landed tight behind the low wing aircraft that had turned in front of me (still no Tower chatter). A dreadful dereliction of duty by the FAA controllers. My landing was safe and in control; but all in all; my worst OSH arrival. My radio has operating fine and did on all frequencies going to and from OSH.

Data retrieved from NASA's ASRS site as of July 2013 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.