Air carrier X TCASII RA from ghost target. Evasive action taken.

Attributes
ACN	247278
Time
Date	199304
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : ord
State Reference	IL
Altitude	msl bound lower : 7000 msl bound upper : 7500
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	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	other personnel other
Qualification	controller : radar
ASRS Report	247278
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller radar : 13
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude non adherence : clearance
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

Air carrier X advised RA and initiated climb to 7500 ft. Only other aircraft in vicinity was at 3000 ft, 2 mi southwest of air carrier X.

Original NASA ASRS Text

Title: ACR X TCASII RA FROM GHOST TARGET. EVASIVE ACTION TAKEN.

Narrative: ACR X ADVISED RA AND INITIATED CLB TO 7500 FT. ONLY OTHER ACFT IN VICINITY WAS AT 3000 FT, 2 MI SW OF ACR X.

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.