Air carrier X TCASII RA with VFR Y. Evasive action taken. See and avoid concept.

Attributes
ACN	257999
Time
Date	199312
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : tvc
State Reference	MN
Altitude	msl bound lower : 3100 msl bound upper : 3100
Environment
Flight Conditions	Mixed
Light	Night
Aircraft 1
Controlling Facilities	artcc : zmp
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Flight Plan	VFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 9
ASRS Report	257999
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : nmac other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	vertical : 200
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Air carrier X at 3100 ft descending into tvc. I was calling traffic on aircraft Y, VFR at 3100 ft. Air carrier X requested vector too late for me to give an effective one. Air carrier X remained in and out of the clouds till he got a TCASII RA and climbed. Problem would have been resolved had the VFR stayed a full 500 ft below the cloud deck.

Original NASA ASRS Text

Title: ACR X TCASII RA WITH VFR Y. EVASIVE ACTION TAKEN. SEE AND AVOID CONCEPT.

Narrative: ACR X AT 3100 FT DSNDING INTO TVC. I WAS CALLING TFC ON ACFT Y, VFR AT 3100 FT. ACR X REQUESTED VECTOR TOO LATE FOR ME TO GIVE AN EFFECTIVE ONE. ACR X REMAINED IN AND OUT OF THE CLOUDS TILL HE GOT A TCASII RA AND CLBED. PROB WOULD HAVE BEEN RESOLVED HAD THE VFR STAYED A FULL 500 FT BELOW THE CLOUD DECK.

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.