False TCASII RA with audible on short final disturbs air carrier PIC.

Attributes
ACN	186834
Time
Date	199108
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : rdu
State Reference	NC
Altitude	msl bound lower : 500 msl bound upper : 500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : rdu
Operator	common carrier : air carrier
Make Model Name	Medium Transport, High Wing, 2 Turboprop Eng
Flight Phase	descent : approach
Route In Use	approach : straight in
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : atp pilot : commercial
Experience	flight time last 90 days : 150 flight time total : 6300 flight time type : 1400
ASRS Report	186834
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation other

Narrative:

TCASII RA instructions to descend received on short final, fully configured. We were in compliance. Also showed a false target 300 ft above us descending. In reality there was 'no traffic' at this location. A 'phantom' during this critical phase of flight in VMC. This type of alert is a big distraction. Solution #1: get better TCASII equipment/software. Solution #2: include a provision for crew to shut off/stand by TCASII on this or critical phases of flight, ie, on final approach below 1000 ft and on takeoff below 1000 ft.

Original NASA ASRS Text

Title: FALSE TCASII RA WITH AUDIBLE ON SHORT FINAL DISTURBS ACR PIC.

Narrative: TCASII RA INSTRUCTIONS TO DSND RECEIVED ON SHORT FINAL, FULLY CONFIGURED. WE WERE IN COMPLIANCE. ALSO SHOWED A FALSE TARGET 300 FT ABOVE US DSNDING. IN REALITY THERE WAS 'NO TFC' AT THIS LOCATION. A 'PHANTOM' DURING THIS CRITICAL PHASE OF FLT IN VMC. THIS TYPE OF ALERT IS A BIG DISTR. SOLUTION #1: GET BETTER TCASII EQUIP/SOFTWARE. SOLUTION #2: INCLUDE A PROVISION FOR CREW TO SHUT OFF/STAND BY TCASII ON THIS OR CRITICAL PHASES OF FLT, IE, ON FINAL APCH BELOW 1000 FT AND ON TKOF BELOW 1000 FT.

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.