Air carrier X TCASII RA from VFR aircraft while on approach.

Attributes
ACN	247286
Time
Date	199306
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : ord
State Reference	IL
Altitude	msl bound lower : 3200 msl bound upper : 3200
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : ord
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	other personnel other
Qualification	controller : radar
ASRS Report	247286
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller radar : 12
Events
Anomaly	altitude deviation : undershoot non adherence : clearance
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 3000 vertical : 2100
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

Air carrier X was turned to a 250 degree heading and cleared for runway 22R ILS maintain 3000 ft until established on localizer. As air carrier X was intercepting the localizer descending through 3200 ft he advised he had an RA and climbed to 3500 ft. The only traffic in his vicinity was a VFR at 1100 ft passing 1/2 mi behind him.

Original NASA ASRS Text

Title: ACR X TCASII RA FROM VFR ACFT WHILE ON APCH.

Narrative: ACR X WAS TURNED TO A 250 DEG HDG AND CLRED FOR RWY 22R ILS MAINTAIN 3000 FT UNTIL ESTABLISHED ON LOC. AS ACR X WAS INTERCEPTING THE LOC DSNDING THROUGH 3200 FT HE ADVISED HE HAD AN RA AND CLBED TO 3500 FT. THE ONLY TFC IN HIS VICINITY WAS A VFR AT 1100 FT PASSING 1/2 MI BEHIND HIM.

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.