B747-400
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Aircraft Equipment Problem Critical
Flight Crew FLC complied w / Automation / Advisory
Aircraft
Approximately 3 hours after takeoff; STAR & APPROACH updated. We noted PROG P2/2 no destination ETA and FUEL REMAINING values. Also; no fuel values for fuel used on engines 1-4. Wind ALT & OAT inserted. Shortly thereafter; Captain LEGS page blanked then restored. Then DUAL FMC FAILURE - Right FMC VTK; then LNAV- VNAV-ATS failures.; with CDU message TIMEOUT-RESELECT displayed. As Pilot Monitoring; I reinserted data into perf init.; route; legs pages. Normal operation for a while; then thereafter; 3 more dual FMC failures. After 4th failure; I was unable to restore FMC ops. QRH CL accomplished. ATC was advised. ATC RVs requested. Normal flight thereafter today VMC APPROACH Runway XL ZZZ.Suggestions: Upgrade legacy FMCS to NG. Continuous training.
B747 Captain reported multiple FMS failures that resulted in a diversion.