Narrative:

A B747 (X) heavy was given an ILS to runway 25L at lax. Air carrier Y was turned on 4 mi in-trail and crossed hunda intersection less than 5 mi in-trail, less than 1000 ft above. Actual altitude at hunda were 3500 ft for the B747 and 4000 ft for the C120 (Y). I called the associate handoff position, upon seeing the operational error and asked if visual separation was being applied. He responded with I don't know.' then off recorded land lines, I asked 'do we need scratch pad on air carrier Y.' this denotes (scratch pad) that visual separation is being applied. I was told 'you tell us.' by the time I could talk to air carrier Y (radio communications xfer), there was 5 mi between aircraft. I repeatedly called air carrier Y pointing out the B747 ahead and initiated a handoff to departure. They accepted the handoff. With the B747 less than 1 mi from touchdown, I tried one last time to effect visual separation and air carrier Y reported the B747 'in sight.' I instructed air carrier Y to maintain visual separation and cleared him for a visual approach. I then notified departures that air carrier Y was not going around and modified the position tag back to AR1's symbol. I believe management saw the error and both AR1 and AH1 were aware of the loss of separation. Air carrier Y had less than 6 mi behind the B747.

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Original NASA ASRS Text

Title: SCT CTLR SEPARATES 2 ACR ACFT LNDG LAX AFTER BEING XFERRED BY ANOTHER ADJACENT CTL SECTOR WITH LTSS.

Narrative: A B747 (X) HVY WAS GIVEN AN ILS TO RWY 25L AT LAX. ACR Y WAS TURNED ON 4 MI IN-TRAIL AND CROSSED HUNDA INTXN LESS THAN 5 MI IN-TRAIL, LESS THAN 1000 FT ABOVE. ACTUAL ALT AT HUNDA WERE 3500 FT FOR THE B747 AND 4000 FT FOR THE C120 (Y). I CALLED THE ASSOCIATE HDOF POS, UPON SEEING THE OPERROR AND ASKED IF VISUAL SEPARATION WAS BEING APPLIED. HE RESPONDED WITH I DON'T KNOW.' THEN OFF RECORDED LAND LINES, I ASKED 'DO WE NEED SCRATCH PAD ON ACR Y.' THIS DENOTES (SCRATCH PAD) THAT VISUAL SEPARATION IS BEING APPLIED. I WAS TOLD 'YOU TELL US.' BY THE TIME I COULD TALK TO ACR Y (RADIO COMS XFER), THERE WAS 5 MI BTWN ACFT. I REPEATEDLY CALLED ACR Y POINTING OUT THE B747 AHEAD AND INITIATED A HDOF TO DEP. THEY ACCEPTED THE HDOF. WITH THE B747 LESS THAN 1 MI FROM TOUCHDOWN, I TRIED ONE LAST TIME TO EFFECT VISUAL SEPARATION AND ACR Y RPTED THE B747 'IN SIGHT.' I INSTRUCTED ACR Y TO MAINTAIN VISUAL SEPARATION AND CLRED HIM FOR A VISUAL APCH. I THEN NOTIFIED DEPS THAT ACR Y WAS NOT GOING AROUND AND MODIFIED THE POS TAG BACK TO AR1'S SYMBOL. I BELIEVE MGMNT SAW THE ERROR AND BOTH AR1 AND AH1 WERE AWARE OF THE LOSS OF SEPARATION. ACR Y HAD LESS THAN 6 MI BEHIND THE B747.

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.