B767 crew had false TCASII RA in ZLC class a.

Attributes
ACN	481062
Time
Date	200008
Day	Sun
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : gtf.airport
State Reference	MT
Altitude	msl bound lower : 40500 msl bound upper : 41000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zlc.artcc
Operator	common carrier : air carrier
Make Model Name	B767-200
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : cfi pilot : atp
Experience	flight time last 90 days : 120 flight time total : 9900 flight time type : 300
ASRS Report	481062
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : atp pilot : multi engine
Experience	flight time last 90 days : 100 flight time total : 2850 flight time type : 100
ASRS Report	481057
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : took evasive action other
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

At FL410 we received a TCASII RA to descend at approximately 2000 FPM. At FL405 RA went away. ATC confirmed no traffic in our vicinity. There was no traffic symbol depicted on our TCASII display either. A few moments later we had another false TCASII alert, and ATC verified no traffic in area. After 3 false warnings in a few mins we turned off the TCASII equipment.

Original NASA ASRS Text

Title: B767 CREW HAD FALSE TCASII RA IN ZLC CLASS A.

Narrative: AT FL410 WE RECEIVED A TCASII RA TO DSND AT APPROX 2000 FPM. AT FL405 RA WENT AWAY. ATC CONFIRMED NO TFC IN OUR VICINITY. THERE WAS NO TFC SYMBOL DEPICTED ON OUR TCASII DISPLAY EITHER. A FEW MOMENTS LATER WE HAD ANOTHER FALSE TCASII ALERT, AND ATC VERIFIED NO TFC IN AREA. AFTER 3 FALSE WARNINGS IN A FEW MINS WE TURNED OFF THE TCASII EQUIP.

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.