C172 pilot trainee made a go around at the direction of the reporting instructor during a visual approach due to another cessna passing 200 ft below him for the same runway. The controller had not noticed the conflict since the tower is not radar equipped.

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Attributes
ACN	532103
Time
Date	200112
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ues.airport
State Reference	WI
Altitude	msl single value : 1400
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : ues.tower
Operator	general aviation : instructional
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	landing : go around
Route In Use	approach : visual
Flight Plan	None
Aircraft 2
Controlling Facilities	tower : ues.tower
Operator	general aviation : personal
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Person 1
Affiliation	other
Function	instruction : instructor
Qualification	pilot : cfi pilot : commercial pilot : instrument
Experience	flight time last 90 days : 125 flight time total : 925
ASRS Report	531103
Person 2
Affiliation	other
Function	instruction : trainee
Events
Anomaly	conflict : nmac
Independent Detector	other flight crewa
Resolutory Action	flight crew : executed go around
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 0 vertical : 200
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	other

Narrative:

I was coming in on an 8 mi straight-in visual approach for runway 18, from 3500 ft MSL, doing instruction, cleared to proceed on final #4 for the airport behind the 360 degree turning traffic for runway 18. I idented the mooney as #3, and #2 ahead of it. As I continued on the approach, I was about to call for my clearance to land on runway 18, and a small cessna passed from underneath me, in front of my aircraft's nose. It was about 200 ft below and just ahead of me, so I performed a go around to the right and entered the pattern and landed the airplane. The tower wasn't able to determine the distance as well as me, but did notice the need to go around. Ues (waukesha county airport, wi). Dec/xa/01. Ues is the third busiest airport in the state of wisconsin, and it doesn't have radar. This isn't the first time this has happened to any of us who fly at ues on a daily basis.

Original NASA ASRS Text

Title: C172 PLT TRAINEE MADE A GAR AT THE DIRECTION OF THE RPTING INSTRUCTOR DURING A VISUAL APCH DUE TO ANOTHER CESSNA PASSING 200 FT BELOW HIM FOR THE SAME RWY. THE CTLR HAD NOT NOTICED THE CONFLICT SINCE THE TWR IS NOT RADAR EQUIPPED.

Narrative: I WAS COMING IN ON AN 8 MI STRAIGHT-IN VISUAL APCH FOR RWY 18, FROM 3500 FT MSL, DOING INSTRUCTION, CLRED TO PROCEED ON FINAL #4 FOR THE ARPT BEHIND THE 360 DEG TURNING TFC FOR RWY 18. I IDENTED THE MOONEY AS #3, AND #2 AHEAD OF IT. AS I CONTINUED ON THE APCH, I WAS ABOUT TO CALL FOR MY CLRNC TO LAND ON RWY 18, AND A SMALL CESSNA PASSED FROM UNDERNEATH ME, IN FRONT OF MY ACFT'S NOSE. IT WAS ABOUT 200 FT BELOW AND JUST AHEAD OF ME, SO I PERFORMED A GAR TO THE R AND ENTERED THE PATTERN AND LANDED THE AIRPLANE. THE TWR WASN'T ABLE TO DETERMINE THE DISTANCE AS WELL AS ME, BUT DID NOTICE THE NEED TO GO AROUND. UES (WAUKESHA COUNTY ARPT, WI). DEC/XA/01. UES IS THE THIRD BUSIEST ARPT IN THE STATE OF WISCONSIN, AND IT DOESN'T HAVE RADAR. THIS ISN'T THE FIRST TIME THIS HAS HAPPENED TO ANY OF US WHO FLY AT UES ON A DAILY BASIS.

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.