C172 pilot and a mooney had an near midair collision in dpa class D airspace.

Attributes
ACN	584589
Time
Date	200306
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dpa.airport
State Reference	IL
Altitude	msl single value : 2500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : dpa.tower
Operator	general aviation : personal
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Flight Plan	None
Aircraft 2
Controlling Facilities	tower : dpa.tower
Operator	general aviation : personal
Make Model Name	M-20 Series Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : multi engine pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 35 flight time total : 760
ASRS Report	584589
Person 2
Affiliation	other
Function	flight crew : single pilot
Events
Anomaly	conflict : nmac non adherence : published procedure non adherence : required legal separation non adherence : far
Independent Detector	other flight crewa other flight crewb
Resolutory Action	controller : issued advisory flight crew : took evasive action
Miss Distance	horizontal : 10 vertical : 15
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	ATC Human Performance

Narrative:

Inbound from practice area. Reported to dupage tower over covered race track that we had 'ATIS information over covered race track inbound to land.' we received a clearance to 'report river, expect straight-in runway 10.' approximately 1 min or less later, a mooney reported 8 mi to the west of the dpa airport. Within 10 seconds of his report, he descended on top of us but was ahead of us slightly. Tower then advised us that there was mooney traffic. At this point the mooney started climbing to be able to see us. We then asked tower for a 360 degree turn to create separation and then proceeded inbound. Reported river and landed runway 10 safely. I did not see the traffic because he was overtaking me from behind. With the mooney aircraft descending he/she should have seen me and passed to the right. Classic example of a low wing aircraft descending on a high wing aircraft.

Original NASA ASRS Text

Title: C172 PLT AND A MOONEY HAD AN NMAC IN DPA CLASS D AIRSPACE.

Narrative: INBOUND FROM PRACTICE AREA. RPTED TO DUPAGE TWR OVER COVERED RACE TRACK THAT WE HAD 'ATIS INFO OVER COVERED RACE TRACK INBOUND TO LAND.' WE RECEIVED A CLRNC TO 'RPT RIVER, EXPECT STRAIGHT-IN RWY 10.' APPROX 1 MIN OR LESS LATER, A MOONEY RPTED 8 MI TO THE W OF THE DPA ARPT. WITHIN 10 SECONDS OF HIS RPT, HE DSNDED ON TOP OF US BUT WAS AHEAD OF US SLIGHTLY. TWR THEN ADVISED US THAT THERE WAS MOONEY TFC. AT THIS POINT THE MOONEY STARTED CLBING TO BE ABLE TO SEE US. WE THEN ASKED TWR FOR A 360 DEG TURN TO CREATE SEPARATION AND THEN PROCEEDED INBOUND. RPTED RIVER AND LANDED RWY 10 SAFELY. I DID NOT SEE THE TFC BECAUSE HE WAS OVERTAKING ME FROM BEHIND. WITH THE MOONEY ACFT DSNDING HE/SHE SHOULD HAVE SEEN ME AND PASSED TO THE R. CLASSIC EXAMPLE OF A LOW WING ACFT DSNDING ON A HIGH WING ACFT.

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.