Narrative:

Cleared for visual approach to runway 24R then changed to runway 24L. With first officer flying, I got distraction entering runway 24L and ILS not operating. Words 'stadium visual approach' were not used, however, I assumed that was intent as runway was not in sight at 10 NM. Socal approach alerted us to B757 on approach to runway 25L. First officer was slow turning final and our aircraft came dangerously close to above B757 after we overshot the runway 24L centerline. Although I had visual reference to the B757 I momentarily lost situational awareness, probably due to ILS runway 24L not operating and having missed approach in 20 NM range, therefore, not giving a very vivid visual depiction of how far south of runway 24L centerline we were. I believe this situation would have been prevented had socal approach given a more precise clearance, and I had paid more attention to the runway extended centerline on the missed approach and the ground visual track with which I am familiar. This incident was at the end of a 10 hour flight from osaka, japan, with myself as a check airman giving a check to a first officer who had experience training difficulties. Relief first officer's were helpful but could have been more assertive earlier.

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Original NASA ASRS Text

Title: WDB ACFT ON VISUAL APCH. DUE TO RESTR VISIBILITY FLC REQUESTED HDG VECTOR FOR RWY AND TRIED TO RECEIVE ILS WHICH WAS OFF THE AIR. PF, FO, OVERSHOT RWY CTRLINE, INTRUDED INTO APCH PATH OF PARALLEL RWY TFC AND PASSED UNDER AN ACFT ON APCH.

Narrative: CLRED FOR VISUAL APCH TO RWY 24R THEN CHANGED TO RWY 24L. WITH FO FLYING, I GOT DISTR ENTERING RWY 24L AND ILS NOT OPERATING. WORDS 'STADIUM VISUAL APCH' WERE NOT USED, HOWEVER, I ASSUMED THAT WAS INTENT AS RWY WAS NOT IN SIGHT AT 10 NM. SOCAL APCH ALERTED US TO B757 ON APCH TO RWY 25L. FO WAS SLOW TURNING FINAL AND OUR ACFT CAME DANGEROUSLY CLOSE TO ABOVE B757 AFTER WE OVERSHOT THE RWY 24L CTRLINE. ALTHOUGH I HAD VISUAL REF TO THE B757 I MOMENTARILY LOST SITUATIONAL AWARENESS, PROBABLY DUE TO ILS RWY 24L NOT OPERATING AND HAVING MISSED APCH IN 20 NM RANGE, THEREFORE, NOT GIVING A VERY VIVID VISUAL DEPICTION OF HOW FAR S OF RWY 24L CTRLINE WE WERE. I BELIEVE THIS SIT WOULD HAVE BEEN PREVENTED HAD SOCAL APCH GIVEN A MORE PRECISE CLRNC, AND I HAD PAID MORE ATTN TO THE RWY EXTENDED CTRLINE ON THE MISSED APCH AND THE GND VISUAL TRACK WITH WHICH I AM FAMILIAR. THIS INCIDENT WAS AT THE END OF A 10 HR FLT FROM OSAKA, JAPAN, WITH MYSELF AS A CHK AIRMAN GIVING A CHK TO A FO WHO HAD EXPERIENCE TRAINING DIFFICULTIES. RELIEF FO'S WERE HELPFUL BUT COULD HAVE BEEN MORE ASSERTIVE EARLIER.

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.