DC9 on arrival to msp experienced TCASII RA with VFR BE90 opposite direction.

Attributes
ACN	594011
Time
Date	200309
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : eau.vortac
State Reference	WI
Altitude	msl bound lower : 10300 msl bound upper : 11800
Environment
Flight Conditions	VMC
Light	Dawn
Aircraft 1
Controlling Facilities	artcc : zmp.artcc
Operator	common carrier : air carrier
Make Model Name	DC-9 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : intermediate altitude descent : approach
Route In Use	arrival star : eau
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zmp.artcc
Make Model Name	King Air C90 E90
Flight Phase	climbout : vacating altitude climbout : intermediate altitude
Flight Plan	VFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 16.5 controller time certified in position1 : 5 flight time total : 80
ASRS Report	594011
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : airborne critical
Independent Detector	atc equipment : conflict alert aircraft equipment : tcas other controllera
Resolutory Action	flight crew : took evasive action
Miss Distance	horizontal : 0 vertical : 500
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	Ambiguous

Narrative:

Aircraft Y had departed stp with a destination of cwa on an IFR flight plane. Pilot cancelled IFR portion of flight prior to entering ZMP airspace, and proceeded eastbound on a rteing opposite the EAU6 arrival to msp. Aircraft Y was not receiving VFR advisories and appeared as a limited data block. Air carrier X was inbound to msp descending to 11000 ft along EAU6 arrival. Traffic issued when VFR target of aircraft Y at 10300 ft. VFR target indicated a climb to approximately 11800 ft. Air carrier X reported RA and climbed.

Original NASA ASRS Text

Title: DC9 ON ARR TO MSP EXPERIENCED TCASII RA WITH VFR BE90 OPPOSITE DIRECTION.

Narrative: ACFT Y HAD DEPARTED STP WITH A DEST OF CWA ON AN IFR FLT PLANE. PLT CANCELLED IFR PORTION OF FLT PRIOR TO ENTERING ZMP AIRSPACE, AND PROCEEDED EBOUND ON A RTEING OPPOSITE THE EAU6 ARR TO MSP. ACFT Y WAS NOT RECEIVING VFR ADVISORIES AND APPEARED AS A LIMITED DATA BLOCK. ACR X WAS INBOUND TO MSP DSNDING TO 11000 FT ALONG EAU6 ARR. TFC ISSUED WHEN VFR TARGET OF ACFT Y AT 10300 FT. VFR TARGET INDICATED A CLB TO APPROX 11800 FT. ACR X RPTED RA AND CLBED.

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.