Narrative:

I was climbing on the crosswind leg of the traffic pattern after my third touch-and-go. As I started my turn from crosswind to downwind, I reached the 800 ft traffic pattern altitude and started to reduce power. Instantly, a cherokee flashed in front of me, then left to right while I was still in the turn to the right onto downwind. The cherokee was no more than 100- 200 ft in front of me at the same altitude. I had not heard the tower talking to the cherokee, nor had I heard the cherokee call the tower during my entire climb out after my third landing. After the cherokee had passed in front of me and then out of my path, I heard the tower clearing the cherokee to land. I asked the tower if they had seen the cherokee pass in front of me. They said yes, and that I should just continue on downwind. I asked if I should do a 360 degree turn to the left for spacing, but they said to just continue straight ahead since the cherokee was faster. I was in the proper position in the pattern. The cherokee had not entered the pattern at the traditional 45 degree midfield downwind position, but instead entered at the point where planes make the crosswind to downwind turn. I don't know if the cherokee pilot ever saw me, and I don't know why the tower didn't see this situation progressing. Fortunately, our planes did not collide. I continued my pattern and made an uneventful touch-and-go, followed by my 5TH landing for a full stop, then taxied back to the ramp. Note: a contributing factor into why we didn't see each other until the last min (if indeed the other pilot ever saw me) was that I was in a high wing plane in a right climbing turn, putting the other plane in my blind spot, and the cherokee was a low wing plane in a descending left turn, putting me in his blind spot. Then when we each reached 800 ft, we leveled out and there we were nearly at the same spot at the same time.

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Original NASA ASRS Text

Title: C152 ACT CLBING OUT FROM TOUCH-AND-GO AND TURNING DOWNWIND HAS NMAC WITH A CHEROKEE ACFT WHICH ENTERED PATTERN INCORRECTLY.

Narrative: I WAS CLBING ON THE XWIND LEG OF THE TFC PATTERN AFTER MY THIRD TOUCH-AND-GO. AS I STARTED MY TURN FROM XWIND TO DOWNWIND, I REACHED THE 800 FT TFC PATTERN ALT AND STARTED TO REDUCE PWR. INSTANTLY, A CHEROKEE FLASHED IN FRONT OF ME, THEN L TO R WHILE I WAS STILL IN THE TURN TO THE R ONTO DOWNWIND. THE CHEROKEE WAS NO MORE THAN 100- 200 FT IN FRONT OF ME AT THE SAME ALT. I HAD NOT HEARD THE TWR TALKING TO THE CHEROKEE, NOR HAD I HEARD THE CHEROKEE CALL THE TWR DURING MY ENTIRE CLBOUT AFTER MY THIRD LNDG. AFTER THE CHEROKEE HAD PASSED IN FRONT OF ME AND THEN OUT OF MY PATH, I HEARD THE TWR CLRING THE CHEROKEE TO LAND. I ASKED THE TWR IF THEY HAD SEEN THE CHEROKEE PASS IN FRONT OF ME. THEY SAID YES, AND THAT I SHOULD JUST CONTINUE ON DOWNWIND. I ASKED IF I SHOULD DO A 360 DEG TURN TO THE L FOR SPACING, BUT THEY SAID TO JUST CONTINUE STRAIGHT AHEAD SINCE THE CHEROKEE WAS FASTER. I WAS IN THE PROPER POS IN THE PATTERN. THE CHEROKEE HAD NOT ENTERED THE PATTERN AT THE TRADITIONAL 45 DEG MIDFIELD DOWNWIND POS, BUT INSTEAD ENTERED AT THE POINT WHERE PLANES MAKE THE XWIND TO DOWNWIND TURN. I DON'T KNOW IF THE CHEROKEE PLT EVER SAW ME, AND I DON'T KNOW WHY THE TWR DIDN'T SEE THIS SIT PROGRESSING. FORTUNATELY, OUR PLANES DID NOT COLLIDE. I CONTINUED MY PATTERN AND MADE AN UNEVENTFUL TOUCH-AND-GO, FOLLOWED BY MY 5TH LNDG FOR A FULL STOP, THEN TAXIED BACK TO THE RAMP. NOTE: A CONTRIBUTING FACTOR INTO WHY WE DIDN'T SEE EACH OTHER UNTIL THE LAST MIN (IF INDEED THE OTHER PLT EVER SAW ME) WAS THAT I WAS IN A HIGH WING PLANE IN A R CLBING TURN, PUTTING THE OTHER PLANE IN MY BLIND SPOT, AND THE CHEROKEE WAS A LOW WING PLANE IN A DSNDING L TURN, PUTTING ME IN HIS BLIND SPOT. THEN WHEN WE EACH REACHED 800 FT, WE LEVELED OUT AND THERE WE WERE NEARLY AT THE SAME SPOT AT THE SAME TIME.

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.