Near midair collision between a DC9 on a left base leg to the left parallel runway and a saab 340 passing under the DC9 and then vectored back for the right parallel runway. The reporting DC9 captain stopped descent in response to a TCASII RA and then observed the saab crossing below.

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Attributes
ACN	432781
Time
Date	199903
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : dxo.vor
State Reference	MI
Altitude	msl bound lower : 4000 msl bound upper : 4500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : d01.tracon
Operator	common carrier : air carrier
Make Model Name	DC-9 30
Operating Under FAR Part	Part 121
Navigation In Use	other vortac
Flight Phase	descent : vacating altitude
Route In Use	approach : visual arrival : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : d10.tracon
Operator	common carrier : air carrier
Make Model Name	SF 340A
Operating Under FAR Part	Part 121
Flight Phase	descent : intermediate altitude
Route In Use	approach : visual arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 200 flight time total : 5000 flight time type : 900
ASRS Report	432781
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 230 flight time total : 21347 flight time type : 3270
ASRS Report	432585
Events
Anomaly	conflict : airborne critical non adherence : required legal separation non adherence other other anomaly other anomaly other
Independent Detector	atc equipment : conflict alert atc equipment other atc equipment : 990 aircraft equipment : tcas aircraft equipment other aircraft equipment : 2 other controllera other controllerb other flight crewa other flight crewb other other : +
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

On vectors for approach to dtw runway 21L, descending to 4000 ft on left base to final, got a TCASII RA. Air carrier Y saab 340 was on vectors right base to final for runway 21R. In VMC, had visual. Captain stopped descent at about 4500 ft MSL. Saab went under us then was vectored 30 degrees back to right and we reacquired visual and ATC separation.

Original NASA ASRS Text

Title: NMAC BTWN A DC9 ON A L BASE LEG TO THE L PARALLEL RWY AND A SAAB 340 PASSING UNDER THE DC9 AND THEN VECTORED BACK FOR THE R PARALLEL RWY. THE RPTING DC9 CAPT STOPPED DSCNT IN RESPONSE TO A TCASII RA AND THEN OBSERVED THE SAAB XING BELOW.

Narrative: ON VECTORS FOR APCH TO DTW RWY 21L, DSNDING TO 4000 FT ON L BASE TO FINAL, GOT A TCASII RA. ACR Y SAAB 340 WAS ON VECTORS R BASE TO FINAL FOR RWY 21R. IN VMC, HAD VISUAL. CAPT STOPPED DSCNT AT ABOUT 4500 FT MSL. SAAB WENT UNDER US THEN WAS VECTORED 30 DEGS BACK TO R AND WE REACQUIRED VISUAL AND ATC SEPARATION.

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.