A PA28 pilot experienced an near midair collision with another PA28 in the pattern at det.

Attributes
ACN	626620
Time
Date	200407
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : det.airport
State Reference	MI
Altitude	agl single value : 1000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : det.tower
Operator	general aviation : personal
Make Model Name	PA-28 Cherokee Arrow IV
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Route In Use	approach : traffic pattern arrival : vfr
Flight Plan	None
Aircraft 2
Controlling Facilities	tower : det.tower
Operator	general aviation : instructional
Make Model Name	PA-28 Cherokee/Archer II/Dakota/Pillan/Warrior
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Route In Use	approach : traffic pattern arrival : vfr
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 80 flight time total : 1250 flight time type : 200
ASRS Report	626620
Person 2
Affiliation	other
Function	controller : local
Events
Anomaly	conflict : nmac non adherence : required legal separation
Independent Detector	other flight crewa
Resolutory Action	controller : issued advisory
Miss Distance	horizontal : 100 vertical : 250
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	Ambiguous

Narrative:

After departing runway 33 at detroit city airport to remain in the pattern, I was told to follow another aircraft in the pattern. I did not see the other aircraft, but continued to fly a regular pattern. Upon turning downwind I still could not see the other aircraft. After reaching the point on downwind, abeam the numbers, and while I was preparing to turn base, the other aircraft flew under my aircraft from left to right. I later learned that a student pilot and his instructor were flying the other aircraft and they were flying a wide pattern with a long crosswind and base.

Original NASA ASRS Text

Title: A PA28 PLT EXPERIENCED AN NMAC WITH ANOTHER PA28 IN THE PATTERN AT DET.

Narrative: AFTER DEPARTING RWY 33 AT DETROIT CITY ARPT TO REMAIN IN THE PATTERN, I WAS TOLD TO FOLLOW ANOTHER ACFT IN THE PATTERN. I DID NOT SEE THE OTHER ACFT, BUT CONTINUED TO FLY A REGULAR PATTERN. UPON TURNING DOWNWIND I STILL COULD NOT SEE THE OTHER ACFT. AFTER REACHING THE POINT ON DOWNWIND, ABEAM THE NUMBERS, AND WHILE I WAS PREPARING TO TURN BASE, THE OTHER ACFT FLEW UNDER MY ACFT FROM L TO R. I LATER LEARNED THAT A STUDENT PLT AND HIS INSTRUCTOR WERE FLYING THE OTHER ACFT AND THEY WERE FLYING A WIDE PATTERN WITH A LONG XWIND AND BASE.

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.