Sct controller clears B747 part 129 air carrier for visual approach to lax runway 24R and consequently the air carrier crosses his final and conflicts with a B757 on approach to runway 25L.

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Attributes
ACN	459725
Time
Date	200001
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : lax.airport
State Reference	CA
Altitude	msl single value : 3700
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sct.tracon
Operator	common carrier : air carrier
Make Model Name	B747 Undifferentiated or Other Model
Operating Under FAR Part	Part 129
Navigation In Use	other
Flight Phase	descent : approach
Route In Use	approach : instrument precision arrival : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : sct.tracon
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : approach
Route In Use	approach : instrument precision
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller radar : 17.5 controller time certified in position1 : 9.5
ASRS Report	459725
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne critical non adherence : clearance other spatial deviation
Independent Detector	atc equipment : conflict alert other controllera other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	faa : investigated
Miss Distance	horizontal : 1800 vertical : 300
Supplementary
Problem Areas	Airspace Structure Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Air carrier X was on right base for runway 24R lax to turn ahead of air carrier Y, who was straight in for runway 25L lax. After being given a turn to join final, air carrier X flew through the localizer and into the path of air carrier Y. Air carrier Y had to turn left off of his final to miss air carrier X.

Original NASA ASRS Text

Title: SCT CTLR CLRS B747 PART 129 ACR FOR VISUAL APCH TO LAX RWY 24R AND CONSEQUENTLY THE ACR CROSSES HIS FINAL AND CONFLICTS WITH A B757 ON APCH TO RWY 25L.

Narrative: ACR X WAS ON R BASE FOR RWY 24R LAX TO TURN AHEAD OF ACR Y, WHO WAS STRAIGHT IN FOR RWY 25L LAX. AFTER BEING GIVEN A TURN TO JOIN FINAL, ACR X FLEW THROUGH THE LOC AND INTO THE PATH OF ACR Y. ACR Y HAD TO TURN L OFF OF HIS FINAL TO MISS ACR X.

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.