Narrative:

Daylight 2 mi visibility at lax cleared for ILS approach to runway 25L at lax. Copilot flying approach manually both navigation set tuned and idented. At approximately 10 mi on final approach TCAS issued a TA alert warning both pilot and copilot diverted their attention (scan) to TCAS screen and at approximately 7 mi the tower inquired what runway we were going to land on. Both pilots returned attention to flight instruments to observe that the aircraft had drifted right of flight path. Aircraft was immediately returned to localizer final path. No conflict was observed and landing was completed without further problems. Comment, both pilots cannot be diverted from primary flight phase. Captain should be sure that the aircraft flight path is being monitored even during TCAS alerts.

Related reports:

Google
 

Original NASA ASRS Text

Title: FLC OF LGT ON ILS APCH TO LAX DRIFTED OFF LOC COURSE.

Narrative: DAYLIGHT 2 MI VISIBILITY AT LAX CLRED FOR ILS APCH TO RWY 25L AT LAX. COPLT FLYING APCH MANUALLY BOTH NAV SET TUNED AND IDENTED. AT APPROX 10 MI ON FINAL APCH TCAS ISSUED A TA ALERT WARNING BOTH PLT AND COPLT DIVERTED THEIR ATTN (SCAN) TO TCAS SCREEN AND AT APPROX 7 MI THE TWR INQUIRED WHAT RWY WE WERE GOING TO LAND ON. BOTH PLTS RETURNED ATTN TO FLT INSTS TO OBSERVE THAT THE ACFT HAD DRIFTED R OF FLT PATH. ACFT WAS IMMEDIATELY RETURNED TO LOC FINAL PATH. NO CONFLICT WAS OBSERVED AND LNDG WAS COMPLETED WITHOUT FURTHER PROBLEMS. COMMENT, BOTH PLTS CANNOT BE DIVERTED FROM PRIMARY FLT PHASE. CAPT SHOULD BE SURE THAT THE ACFT FLT PATH IS BEING MONITORED EVEN DURING TCAS ALERTS.

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.