Near midair collision between a government GA and a departure GA 2 NM west of mwc, wi.

Attributes
ACN	546494
Time
Date	200205
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : mwc.airport
State Reference	WI
Altitude	agl single value : 1500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : mwc.tower
Operator	other
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Route In Use	approach : traffic pattern
Flight Plan	VFR
Aircraft 2
Controlling Facilities	tower : mwc.tower
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Route In Use	approach : traffic pattern
Person 1
Affiliation	government other
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : cfi pilot : instrument
Experience	flight time last 90 days : 45 flight time total : 1400 flight time type : 500
ASRS Report	546494
Person 2
Affiliation	other
Function	flight crew : single pilot
Events
Anomaly	conflict : nmac non adherence : far non adherence : published procedure non adherence : required legal separation other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 250 vertical : 50
Supplementary
Problem Areas	ATC Human Performance Aircraft Flight Crew Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

At 15 mi west of mwc, I got ATIS. Monitored ues, wi, as I passed to the north. 10 mi west, called mwc to report position and altitude (descending out of 4500 ft) to land. Controller advised me to report 2 mi west for right downwind to runway 22. Just before my call at 2 mi west, saw aircraft (aircraft Y) on a collision course. He reacted fine and we both maneuvered away from each other. He reported the near miss. Mwc controller told him to turn on his transponder. I never heard of any traffic departing the area. I was never told to watch for traffic. Later, the controller told me the aircraft had his transponder off and the aircraft had reported to him that he would depart northwest. Controller did a poor job. Airport seemed slow -- little traffic. Both aircraft did not collide because of the pilots seeing each other in time. Controller was not watching or concerned about my entry to traffic pattern.

Original NASA ASRS Text

Title: NMAC BTWN A GOV GA AND A DEP GA 2 NM W OF MWC, WI.

Narrative: AT 15 MI W OF MWC, I GOT ATIS. MONITORED UES, WI, AS I PASSED TO THE N. 10 MI W, CALLED MWC TO RPT POS AND ALT (DSNDING OUT OF 4500 FT) TO LAND. CTLR ADVISED ME TO RPT 2 MI W FOR R DOWNWIND TO RWY 22. JUST BEFORE MY CALL AT 2 MI W, SAW ACFT (ACFT Y) ON A COLLISION COURSE. HE REACTED FINE AND WE BOTH MANEUVERED AWAY FROM EACH OTHER. HE RPTED THE NEAR MISS. MWC CTLR TOLD HIM TO TURN ON HIS XPONDER. I NEVER HEARD OF ANY TFC DEPARTING THE AREA. I WAS NEVER TOLD TO WATCH FOR TFC. LATER, THE CTLR TOLD ME THE ACFT HAD HIS XPONDER OFF AND THE ACFT HAD RPTED TO HIM THAT HE WOULD DEPART NW. CTLR DID A POOR JOB. ARPT SEEMED SLOW -- LITTLE TFC. BOTH ACFT DID NOT COLLIDE BECAUSE OF THE PLTS SEEING EACH OTHER IN TIME. CTLR WAS NOT WATCHING OR CONCERNED ABOUT MY ENTRY TO TFC PATTERN.

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.