Air carrier X false TCASII RA on approach.

Attributes
ACN	259560
Time
Date	199312
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : ord
State Reference	IL
Altitude	msl bound lower : 3800 msl bound upper : 3800
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : ord tower : sfo
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport
Navigation In Use	Other Other
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller radar : 12
ASRS Report	259560
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	none taken : unable
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Air carrier X cleared ILS runway 9R at 3800 ft descending increased rate of descent for TCASII RA showing target 400 ft above. Only aircraft within 4 mi were 2 VFR targets more than 2000 ft below.

Original NASA ASRS Text

Title: ACR X FALSE TCASII RA ON APCH.

Narrative: ACR X CLRED ILS RWY 9R AT 3800 FT DSNDING INCREASED RATE OF DSCNT FOR TCASII RA SHOWING TARGET 400 FT ABOVE. ONLY ACFT WITHIN 4 MI WERE 2 VFR TARGETS MORE THAN 2000 FT BELOW.

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.