Narrative:

The procedure for VFR arrs from the east is to first contact pwk local controller who then instructs the arriving aircraft to contact glenview NAS for fly-by. In this particular instance I was told to expect left traffic for 24 and all navy glenview. After calling glenview I was cleared for the fly-by and when 2 mi southeast of glenview I was released to call pwk. After reporting my position to pwk local controller he instructed me to call him when approaching the tollway. I called as instructed approaching the tollway and was cleared to land on 24. Subsequently I heard the tower tell a high-wing small aircraft Y he would be #2 and later another aircraft he would be #3. As I approached on a left base to 24 the controller cleared the high-wing small aircraft to land and gave my position as a 2 mi base. I immediately began looking for the high-wing who was approaching on a right base for 24. After spotting him I realized we would both intercept the final leg at the same place and time. I informed the tower I was turning 360 degrees to the left for traffic avoidance. He did not appear to fully understand what was transpiring at first but later (a few seconds) got the 'picture'. I completed the 360 and was again cleared to land and did so without incident. The aircraft I had avoided was the fuel pump and I discussed the incident with him. He stated that 'the controller changed his mind' and that he (the other pilot) was preparing to give way at the time I initiated the 360 degree turn maneuver.

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Original NASA ASRS Text

Title: NMAC.

Narrative: THE PROC FOR VFR ARRS FROM THE E IS TO FIRST CONTACT PWK LCL CTLR WHO THEN INSTRUCTS THE ARRIVING ACFT TO CONTACT GLENVIEW NAS FOR FLY-BY. IN THIS PARTICULAR INSTANCE I WAS TOLD TO EXPECT L TFC FOR 24 AND ALL NAVY GLENVIEW. AFTER CALLING GLENVIEW I WAS CLRED FOR THE FLY-BY AND WHEN 2 MI SE OF GLENVIEW I WAS RELEASED TO CALL PWK. AFTER RPTING MY POS TO PWK LCL CTLR HE INSTRUCTED ME TO CALL HIM WHEN APCHING THE TOLLWAY. I CALLED AS INSTRUCTED APCHING THE TOLLWAY AND WAS CLRED TO LAND ON 24. SUBSEQUENTLY I HEARD THE TWR TELL A HIGH-WING SMA Y HE WOULD BE #2 AND LATER ANOTHER ACFT HE WOULD BE #3. AS I APCHED ON A L BASE TO 24 THE CTLR CLRED THE HIGH-WING SMA TO LAND AND GAVE MY POS AS A 2 MI BASE. I IMMEDIATELY BEGAN LOOKING FOR THE HIGH-WING WHO WAS APCHING ON A R BASE FOR 24. AFTER SPOTTING HIM I REALIZED WE WOULD BOTH INTERCEPT THE FINAL LEG AT THE SAME PLACE AND TIME. I INFORMED THE TWR I WAS TURNING 360 DEGS TO THE L FOR TFC AVOIDANCE. HE DID NOT APPEAR TO FULLY UNDERSTAND WHAT WAS TRANSPIRING AT FIRST BUT LATER (A FEW SECONDS) GOT THE 'PICTURE'. I COMPLETED THE 360 AND WAS AGAIN CLRED TO LAND AND DID SO WITHOUT INCIDENT. THE ACFT I HAD AVOIDED WAS THE FUEL PUMP AND I DISCUSSED THE INCIDENT WITH HIM. HE STATED THAT 'THE CTLR CHANGED HIS MIND' AND THAT HE (THE OTHER PLT) WAS PREPARING TO GIVE WAY AT THE TIME I INITIATED THE 360 DEG TURN MANEUVER.

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.