Narrative:

Approximately 10 NM from pdz VOR, ATC changes runways from 25L to 24R. Although insignificant change to them, it is a major change to FMS - since STAR is based on arrival runway, i.e., to program STAR, one must select PD2 for specific runway, select transition, then select ILS for that runway and then its transition. In our case, then we would have to set up direct intercept to pdz. If it was just horizontal navigation, this would be busy. When you are also making crossing restrs, it overloads the cockpit. Then to add insult to injury, they changed us back to runway 25L after we reprogrammed following an FMS freeze-up. Hardly the way to conduct business.

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Original NASA ASRS Text

Title: B767-200 FLC COMMENT ON SCT RWY BALANCING AND COCKPIT FMS WORKLOAD IMPACT WITH MULTIPLE RWY CHANGES.

Narrative: APPROX 10 NM FROM PDZ VOR, ATC CHANGES RWYS FROM 25L TO 24R. ALTHOUGH INSIGNIFICANT CHANGE TO THEM, IT IS A MAJOR CHANGE TO FMS - SINCE STAR IS BASED ON ARRIVAL RWY, I.E., TO PROGRAM STAR, ONE MUST SELECT PD2 FOR SPECIFIC RWY, SELECT TRANSITION, THEN SELECT ILS FOR THAT RWY AND THEN ITS TRANSITION. IN OUR CASE, THEN WE WOULD HAVE TO SET UP DIRECT INTERCEPT TO PDZ. IF IT WAS JUST HORIZONTAL NAV, THIS WOULD BE BUSY. WHEN YOU ARE ALSO MAKING CROSSING RESTRS, IT OVERLOADS THE COCKPIT. THEN TO ADD INSULT TO INJURY, THEY CHANGED US BACK TO RWY 25L AFTER WE REPROGRAMMED FOLLOWING AN FMS FREEZE-UP. HARDLY THE WAY TO CONDUCT BUSINESS.

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.