Gulfstream V / G500 / G550
Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Flight Instructor; Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 50; Flight Crew Total 12000; Flight Crew Type 3000
Workload; Time Pressure
ATC Issue All Types; Aircraft Equipment Problem Less Severe
Flight Crew Overcame Equipment Problem
Procedure; Human Factors
We were cleared the RIIVR2 to runway 25L. At the last minute; over RIIVR intersection; LAX changed runways to runway 24R. When we changed runways in the FMS over RIIVR; the FMS didn't sequence correctly. After trying to change runways with an incredible amount of step down fixes we were able to get things under control. My advice would be not to change runways on an aircraft at the initial fix due to sequencing in the FMS. We need more time to load the FMS with the proper information before starting an approach.
GLF5 Captain reported a very high workload resulted from a late runway change on arrival to LAX.