DC9 FL270 on mizar 2 STAR dtw. TCASII noted target left of screen and gave immediate 2000 ft climb. Disconnected the autoplt and checked out left window and saw aircraft pass below. Controller advised he was non radar at the time.

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Attributes
ACN	364177
Time
Date	199703
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : dqn
State Reference	OH
Altitude	msl bound lower : 27000 msl bound upper : 28300
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : zid
Operator	common carrier : air carrier
Make Model Name	DC-9 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Route In Use	arrival star : star
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	DC-9 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 7500 flight time type : 780
ASRS Report	364177
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : far non adherence : published procedure other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Miss Distance	horizontal : 0 vertical : 600
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

On the mizar 2 arrival into dtw at 25 mi north of dqn at assigned altitude of FL270, TCASII suddenly advised 'traffic,' and noticed a yellow target barely on left of screen. Immediately it went to 'climb' mode with a 2000 ft climb (green) indicated. I disengaged autoplt and advanced power levers at the same time. At the same time we looked out the left window and saw the other aircraft at our altitude and passing slightly below us as I climbed. We (captain) reported a TCASII climb to FL283. Controller was working numerous aircraft and mentioned at this time he was non radar and thanked us. No injuries to anybody. Captain mentioned on radio that it would have been a 'bulls- eye.' other aircraft reaffirmed that.

Original NASA ASRS Text

Title: DC9 FL270 ON MIZAR 2 STAR DTW. TCASII NOTED TARGET L OF SCREEN AND GAVE IMMEDIATE 2000 FT CLB. DISCONNECTED THE AUTOPLT AND CHKED OUT L WINDOW AND SAW ACFT PASS BELOW. CTLR ADVISED HE WAS NON RADAR AT THE TIME.

Narrative: ON THE MIZAR 2 ARR INTO DTW AT 25 MI N OF DQN AT ASSIGNED ALT OF FL270, TCASII SUDDENLY ADVISED 'TFC,' AND NOTICED A YELLOW TARGET BARELY ON L OF SCREEN. IMMEDIATELY IT WENT TO 'CLB' MODE WITH A 2000 FT CLB (GREEN) INDICATED. I DISENGAGED AUTOPLT AND ADVANCED PWR LEVERS AT THE SAME TIME. AT THE SAME TIME WE LOOKED OUT THE L WINDOW AND SAW THE OTHER ACFT AT OUR ALT AND PASSING SLIGHTLY BELOW US AS I CLBED. WE (CAPT) RPTED A TCASII CLB TO FL283. CTLR WAS WORKING NUMEROUS ACFT AND MENTIONED AT THIS TIME HE WAS NON RADAR AND THANKED US. NO INJURIES TO ANYBODY. CAPT MENTIONED ON RADIO THAT IT WOULD HAVE BEEN A 'BULLS- EYE.' OTHER ACFT REAFFIRMED THAT.

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.