Air carrier on approach has TCASII RA to climb when 500 ft AGL.

Attributes
ACN	238071
Time
Date	199304
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : lax
State Reference	CA
Altitude	agl bound lower : 500 agl bound upper : 500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : lax
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 210 flight time total : 8400 flight time type : 210
ASRS Report	238071
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : nmac non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action other
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 0 vertical : 100
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

TCASII advisory and RA caused by light twin flying under (no visual acquisition, just TCASII positioning) our large transport while we were approximately 500 ft AGL on final (ILS) to lax. RA called for climb of approximately 2000 FPM and initiated it in conjunction with missed approach. Spurious TCASII signals caused confusion during go around as to his exact position. Conversation with tower supervisor indicated his clearance was to turn behind our aircraft to land runway 25R. Supervisor refused to give us the other aircraft tail number.

Original NASA ASRS Text

Title: ACR ON APCH HAS TCASII RA TO CLB WHEN 500 FT AGL.

Narrative: TCASII ADVISORY AND RA CAUSED BY LIGHT TWIN FLYING UNDER (NO VISUAL ACQUISITION, JUST TCASII POSITIONING) OUR LGT WHILE WE WERE APPROX 500 FT AGL ON FINAL (ILS) TO LAX. RA CALLED FOR CLB OF APPROX 2000 FPM AND INITIATED IT IN CONJUNCTION WITH MISSED APCH. SPURIOUS TCASII SIGNALS CAUSED CONFUSION DURING GAR AS TO HIS EXACT POS. CONVERSATION WITH TWR SUPVR INDICATED HIS CLRNC WAS TO TURN BEHIND OUR ACFT TO LAND RWY 25R. SUPVR REFUSED TO GIVE US THE OTHER ACFT TAIL NUMBER.

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.