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A B757-200 flight crew on approach to lax got a late change to their runway assignment and deviated right of course while they reprogrammed the FMC.
| Attributes | |
| ACN | 706311 |
| Time | |
| Date | 200608 |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : lax.airport |
| State Reference | CA |
| Altitude | msl single value : 1500 |
| Environment | |
| Flight Conditions | Marginal |
| Aircraft 1 | |
| Controlling Facilities | tower : lax.tower tower : atl.tower |
| 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 | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 240 flight time total : 21000 flight time type : 10000 |
| ASRS Report | 706311 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | non adherence : published procedure non adherence : clearance other spatial deviation |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended or assigned course |
| Supplementary | |
| Problem Areas | ATC Human Performance Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
Narrative:
We normally set up our navigation 1 hour out and brief the approach just before descent. At most airports you can tell what runway you will get; but at lax you never know until approach control gives you the runway and at the same time starts you down a challenging profile descent; with several descent altitudes. If you did not 'guess' correctly it now starts a 'fire drill' in the cockpit as one pilot starts descending to the first altitude as the other pilot reprograms the FMC; sets and idents the radios. Briefs the new missed approach; sets the new decision ht; and briefs the runway exit plan. In all of this; we ended up slightly right of course because we both switched the ILS frequency; ending up on the original frequency; then reset. I called approach later. He said no conflict was caused.
Original NASA ASRS Text
Title: A B757-200 FLT CREW ON APCH TO LAX GOT A LATE CHANGE TO THEIR RWY ASSIGNMENT AND DEVIATED R OF COURSE WHILE THEY REPROGRAMMED THE FMC.
Narrative: WE NORMALLY SET UP OUR NAV 1 HR OUT AND BRIEF THE APCH JUST BEFORE DSCNT. AT MOST ARPTS YOU CAN TELL WHAT RWY YOU WILL GET; BUT AT LAX YOU NEVER KNOW UNTIL APCH CTL GIVES YOU THE RWY AND AT THE SAME TIME STARTS YOU DOWN A CHALLENGING PROFILE DSCNT; WITH SEVERAL DSCNT ALTS. IF YOU DID NOT 'GUESS' CORRECTLY IT NOW STARTS A 'FIRE DRILL' IN THE COCKPIT AS ONE PLT STARTS DSNDING TO THE FIRST ALT AS THE OTHER PLT REPROGRAMS THE FMC; SETS AND IDENTS THE RADIOS. BRIEFS THE NEW MISSED APCH; SETS THE NEW DECISION HT; AND BRIEFS THE RWY EXIT PLAN. IN ALL OF THIS; WE ENDED UP SLIGHTLY R OF COURSE BECAUSE WE BOTH SWITCHED THE ILS FREQ; ENDING UP ON THE ORIGINAL FREQ; THEN RESET. I CALLED APCH LATER. HE SAID NO CONFLICT WAS CAUSED.
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.