Flight crew of a B737 slowed during approach due to TCASII warning causing ATC to send another aircraft following reporter around. TCASII was apparently a false warning. Flight crew could not get through to ATC when slowing due to frequency congestion.

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Attributes
ACN	421450
Time
Date	199811
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : stl
State Reference	MO
Altitude	msl bound lower : 3500 msl bound upper : 3500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 300 flight time total : 20000 flight time type : 10000
ASRS Report	421450
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial
Events
Anomaly	non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	none taken : detected after the fact other other
Consequence	Other
Supplementary
Air Traffic Incident	Pilot Deviation

Narrative:

We got a faulty indication on TCASII concerning the aircraft in front of us (also on approach for runway 30R stl). We slowed down to avoid it. This apparently caused a go around for the aircraft following us. Approach control chewed us out for it. I explained that we got busy with the TCASII and was not able to tell him in time. (Besides I think he had us packed too close on the approach.)

Original NASA ASRS Text

Title: FLC OF A B737 SLOWED DURING APCH DUE TO TCASII WARNING CAUSING ATC TO SEND ANOTHER ACFT FOLLOWING RPTR AROUND. TCASII WAS APPARENTLY A FALSE WARNING. FLC COULD NOT GET THROUGH TO ATC WHEN SLOWING DUE TO FREQ CONGESTION.

Narrative: WE GOT A FAULTY INDICATION ON TCASII CONCERNING THE ACFT IN FRONT OF US (ALSO ON APCH FOR RWY 30R STL). WE SLOWED DOWN TO AVOID IT. THIS APPARENTLY CAUSED A GAR FOR THE ACFT FOLLOWING US. APCH CTL CHEWED US OUT FOR IT. I EXPLAINED THAT WE GOT BUSY WITH THE TCASII AND WAS NOT ABLE TO TELL HIM IN TIME. (BESIDES I THINK HE HAD US PACKED TOO CLOSE ON THE APCH.)

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.