Mdt flight crew observed traffic take evasive action to avoid but near midair collision ensued.

Attributes
ACN	170405
Time
Date	199102
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : dtw
State Reference	MI
Altitude	msl bound lower : 4800 msl bound upper : 5000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : dtw
Operator	common carrier : air carrier
Make Model Name	Medium Transport, High Wing, 2 Turboprop Eng
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Transport
Flight Phase	cruise other
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi pilot : commercial pilot : instrument
Experience	flight time last 90 days : 150 flight time total : 2300 flight time type : 500
ASRS Report	170405
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : nmac
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 0 vertical : 200
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Heading west after departing dtw 20 NM west 5000' MSL, level flight, sighted aircraft at 4 O'clock position approximately 3 NM heading at us. Aircraft appeared lower and would pass beneath us. Aircraft passed directly below approximately 200-300' lower. It was an small transport. When they saw us they took evasive action, (steep right turn) however, the aircraft passed below us during the turn, then proceeded northwest of our position. The air carrier pilots reported a near miss. No traffic alert from dtw departure.

Original NASA ASRS Text

Title: MDT FLT CREW OBSERVED TRAFFIC TAKE EVASIVE ACTION TO AVOID BUT NMAC ENSUED.

Narrative: HDG W AFTER DEPARTING DTW 20 NM W 5000' MSL, LEVEL FLT, SIGHTED ACFT AT 4 O'CLOCK POS APPROX 3 NM HDG AT US. ACFT APPEARED LOWER AND WOULD PASS BENEATH US. ACFT PASSED DIRECTLY BELOW APPROX 200-300' LOWER. IT WAS AN SMT. WHEN THEY SAW US THEY TOOK EVASIVE ACTION, (STEEP R TURN) HOWEVER, THE ACFT PASSED BELOW US DURING THE TURN, THEN PROCEEDED NW OF OUR POS. THE ACR PLTS RPTED A NEAR MISS. NO TFC ALERT FROM DTW DEP.

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.