Multiple aircraft traffic pattern handling technique by the local controller causing reporter to be resequenced twice after instruction to enter base leg.

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Attributes
ACN	394373
Time
Date	199802
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : enw
State Reference	WI
Altitude	msl bound lower : 1800 msl bound upper : 1800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : enw
Operator	general aviation : personal
Make Model Name	Piper Aircraft Corp Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	cruise other descent : approach other
Route In Use	approach : visual arrival other
Flight Plan	None
Aircraft 2
Make Model Name	PA-28 Cherokee Arrow IV
Operating Under FAR Part	other : unknown
Flight Phase	descent : approach
Route In Use	arrival other
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Experience	flight time last 90 days : 15 flight time total : 400 flight time type : 300
ASRS Report	394373
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Events
Anomaly	conflict : nmac non adherence : clearance other anomaly other
Independent Detector	other controllera other flight crewa
Resolutory Action	controller : issued new clearance flight crew : took evasive action other
Consequence	Other
Miss Distance	horizontal : 500 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	other

Narrative:

In sum: reporter reports 2 mi base leg as instructed but alters course due to converging traffic approaching from the right. Reporter is chastised by controller for turning and is told to turn to the original heading then to extend downwind. Reporter clarifies which direction of downwind since the aircraft is on a base leg and is told due north. Reporter was subsequently told to make a 180 degree turn and was given a clearance to land. A citabria reporting 3 mi final is told to follow the reporter. Reporter informs the tower the aircraft is at 3 O'clock position. The citabria is then given landing clearance after the pilot reports having him (the reporter's aircraft) and that he was slightly ahead. The reporter is then told he is #2. This was the second time the reporter had to alter his course for traffic (the PA28 and the citabria) to avoid a midair collision or near midair collision.

Original NASA ASRS Text

Title: MULTIPLE ACFT TFC PATTERN HANDLING TECHNIQUE BY THE LCL CTLR CAUSING RPTR TO BE RESEQUENCED TWICE AFTER INSTRUCTION TO ENTER BASE LEG.

Narrative: IN SUM: RPTR RPTS 2 MI BASE LEG AS INSTRUCTED BUT ALTERS COURSE DUE TO CONVERGING TFC APCHING FROM THE R. RPTR IS CHASTISED BY CTLR FOR TURNING AND IS TOLD TO TURN TO THE ORIGINAL HEADING THEN TO EXTEND DOWNWIND. RPTR CLARIFIES WHICH DIRECTION OF DOWNWIND SINCE THE ACFT IS ON A BASE LEG AND IS TOLD DUE N. RPTR WAS SUBSEQUENTLY TOLD TO MAKE A 180 DEG TURN AND WAS GIVEN A CLRNC TO LAND. A CITABRIA RPTING 3 MI FINAL IS TOLD TO FOLLOW THE RPTR. RPTR INFORMS THE TWR THE ACFT IS AT 3 O'CLOCK POS. THE CITABRIA IS THEN GIVEN LNDG CLRNC AFTER THE PLT RPTS HAVING HIM (THE RPTR'S ACFT) AND THAT HE WAS SLIGHTLY AHEAD. THE RPTR IS THEN TOLD HE IS #2. THIS WAS THE SECOND TIME THE RPTR HAD TO ALTER HIS COURSE FOR TFC (THE PA28 AND THE CITABRIA) TO AVOID A MIDAIR COLLISION OR NMAC.

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.