Two air carrier aircraft being vectored to parallel runways at lax on converging courses have less than standard separation due to a late turn onto the final approach course.

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Attributes
ACN	687488
Time
Date	200602
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : lax.airport
State Reference	CA
Altitude	msl single value : 5000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sct.tracon
Operator	common carrier : air carrier
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	approach : instrument precision
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : sct.tracon
Operator	common carrier : air carrier
Make Model Name	Brasilia EMB-120 All Series
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller non radar : 2 controller radar : 22 controller time certified in position1 : 16
ASRS Report	687488
Person 2
Affiliation	government : faa
Function	controller : approach
Events
Anomaly	conflict : airborne critical non adherence : published procedure non adherence : required legal separation
Independent Detector	aircraft equipment : tcas other controllera
Resolutory Action	flight crew : executed go around
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

B737-700 was on an ILS approach to runway 24R at lax. E120 was inbound to lax from sli VORTAC. The downe controller of E120 was trying to vector E120 to the runway 25L final ahead of B737-700. The downe controller was late in his turn onto final with E120. The 2 aircraft ended up closer than standard lateral separation. During the next phase of descent; B737-700 was passing E120 and received a TCAS climb warning. B737-700 then climbed and ended up too high to make the airport. B737-700 had to go around because of the TCAS climb. At lax we run simultaneous ILS approachs runway 24R and runway 25L. This happens all the time.

Original NASA ASRS Text

Title: TWO ACR ACFT BEING VECTORED TO PARALLEL RWYS AT LAX ON CONVERGING COURSES HAVE LTSS DUE TO A LATE TURN ONTO THE FINAL APCH COURSE.

Narrative: B737-700 WAS ON AN ILS APCH TO RWY 24R AT LAX. E120 WAS INBOUND TO LAX FROM SLI VORTAC. THE DOWNE CTLR OF E120 WAS TRYING TO VECTOR E120 TO THE RWY 25L FINAL AHEAD OF B737-700. THE DOWNE CTLR WAS LATE IN HIS TURN ONTO FINAL WITH E120. THE 2 ACFT ENDED UP CLOSER THAN STANDARD LATERAL SEPARATION. DURING THE NEXT PHASE OF DSCNT; B737-700 WAS PASSING E120 AND RECEIVED A TCAS CLB WARNING. B737-700 THEN CLBED AND ENDED UP TOO HIGH TO MAKE THE ARPT. B737-700 HAD TO GO AROUND BECAUSE OF THE TCAS CLB. AT LAX WE RUN SIMULTANEOUS ILS APCHS RWY 24R AND RWY 25L. THIS HAPPENS ALL THE TIME.

Data retrieved from NASA's ASRS site as of January 2009 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.