Near midair collision between commuter and small GA aircraft. Pilot deviation.

Attributes
ACN	95614
Time
Date	198809
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : crl airport : dtw
State Reference	MI
Altitude	msl bound lower : 5700 msl bound upper : 6100
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dtw
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	cruise other descent other
Route In Use	approach : visual enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Plan	None
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller military : 2 controller non radar : 2 controller radar : 3
ASRS Report	95614
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 225 flight time total : 5200 flight time type : 2000
ASRS Report	94975
Events
Anomaly	conflict : nmac non adherence : far non adherence : required legal separation other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 0 vertical : 400
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	Pilot Deviation

Narrative:

Commuter X was inbound to detroit metropolitan airport. Called me on approach control at 7000. I descended X to 6000' and continued to talk to other aircraft. A few minutes later aircraft X complained that he had descend 300' to miss small aircraft Y at 6000'. I informed aircraft X that the other aircraft was VFR outside the TCA and not talking to ATC. Also, I was too busy at the time to provide traffic advisories and didn't notice the traffic. Supplemental information from acn 94975. We were in cruise flight at 6000' MSL on a heading of 270 degree talking to dtw approach control inbound on a vector for a visual approach to runway 3R. First officer spotted conflicting traffic on a converging course slightly above us. We took an evasive action by descending approximately 300' and missed the traffic. VFR traffic should call for traffic advisories and flight following when flying through busy approach corridor.

Original NASA ASRS Text

Title: NMAC BETWEEN COMMUTER AND SMALL GA ACFT. PLT DEVIATION.

Narrative: COMMUTER X WAS INBND TO DETROIT METRO ARPT. CALLED ME ON APCH CTL AT 7000. I DSNDED X TO 6000' AND CONTINUED TO TALK TO OTHER ACFT. A FEW MINUTES LATER ACFT X COMPLAINED THAT HE HAD DSND 300' TO MISS SMA Y AT 6000'. I INFORMED ACFT X THAT THE OTHER ACFT WAS VFR OUTSIDE THE TCA AND NOT TALKING TO ATC. ALSO, I WAS TOO BUSY AT THE TIME TO PROVIDE TFC ADVISORIES AND DIDN'T NOTICE THE TFC. SUPPLEMENTAL INFO FROM ACN 94975. WE WERE IN CRUISE FLT AT 6000' MSL ON A HDG OF 270 DEG TALKING TO DTW APCH CTL INBND ON A VECTOR FOR A VISUAL APCH TO RWY 3R. F/O SPOTTED CONFLICTING TFC ON A CONVERGING COURSE SLIGHTLY ABOVE US. WE TOOK AN EVASIVE ACTION BY DSNDING APPROX 300' AND MISSED THE TFC. VFR TFC SHOULD CALL FOR TFC ADVISORIES AND FLT FOLLOWING WHEN FLYING THROUGH BUSY APCH CORRIDOR.

Data retrieved from NASA's ASRS site as of August 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.