A B727 flight crew performs a missed approach when their TCASII detects and generates an RA on an aircraft 100 ft below them while 4 mi from runway 25L at lax, ca.

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Attributes
ACN	476400
Time
Date	200006
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : lax.airport
State Reference	CA
Altitude	msl single value : 1300
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : lax.tower
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 25l
Flight Phase	descent : vacating altitude landing : missed approach
Route In Use	approach : instrument precision
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : commercial pilot : instrument pilot : atp
Experience	flight time last 90 days : 200 flight time total : 3000 flight time type : 350
ASRS Report	476400
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe conflict : nmac inflight encounter other
Independent Detector	aircraft equipment : tcas other flight crewa
Resolutory Action	flight crew : executed missed approach
Consequence	other
Miss Distance	horizontal : 0 vertical : 100
Supplementary
Problem Areas	Airspace Structure Flight Crew Human Performance Aircraft
Primary Problem	Aircraft

Narrative:

While on a 4.5 NM final approach to runway 25L at lax (on ILS glide path, approximately 1300-1500 ft MSL) a TCASII traffic alert sounded, quickly followed by a 'monitor vertical speed' TCASII alert, followed again by a TCASII 'climb' command. A missed approach was then immediately executed. The tower was then immediately notified, who issued subsequent missed approach instructions. When the initial TA was given, we noticed the conflicting aircraft symbol was superimposed on our aircraft symbol on the TCASII display, with 100 ft separation below us. TCASII display was set to 5 NM scale. Lax tower reported no aircraft on their scope at any time.

Original NASA ASRS Text

Title: A B727 FLC PERFORMS A MISSED APCH WHEN THEIR TCASII DETECTS AND GENERATES AN RA ON AN ACFT 100 FT BELOW THEM WHILE 4 MI FROM RWY 25L AT LAX, CA.

Narrative: WHILE ON A 4.5 NM FINAL APCH TO RWY 25L AT LAX (ON ILS GLIDE PATH, APPROX 1300-1500 FT MSL) A TCASII TFC ALERT SOUNDED, QUICKLY FOLLOWED BY A 'MONITOR VERT SPD' TCASII ALERT, FOLLOWED AGAIN BY A TCASII 'CLB' COMMAND. A MISSED APCH WAS THEN IMMEDIATELY EXECUTED. THE TWR WAS THEN IMMEDIATELY NOTIFIED, WHO ISSUED SUBSEQUENT MISSED APCH INSTRUCTIONS. WHEN THE INITIAL TA WAS GIVEN, WE NOTICED THE CONFLICTING ACFT SYMBOL WAS SUPERIMPOSED ON OUR ACFT SYMBOL ON THE TCASII DISPLAY, WITH 100 FT SEPARATION BELOW US. TCASII DISPLAY WAS SET TO 5 NM SCALE. LAX TWR RPTED NO ACFT ON THEIR SCOPE AT ANY TIME.

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.