Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Aircraft Equipment Problem Critical
Flight Crew Overcame Equipment Problem
Aircraft
Shortly after departure from ZZZ we were given radar vectors for the climb after we notified ATC that we were unable to make the next altitude at the next fix on the departure.About five minutes into the climb there was a scratch-pad message re-syncing other FMC (Flight Management Computer) followed by timeout reselect; autothrottle disconnect and EICAS message and autopilot disconnect and EICAS message.After reselecting FMC everything appeared normal and I reselected the Autopilot and connected the auto throttle and reengaged VNAV (Vertical Navigation).Shortly thereafter same happened again with the loss of all initial information in the CDU (Control Display Unit) and no waypoints in either route 1 or 2 and a magenta line through VNAV mode annunciation. The FO (First Officer) notified ATC that we were working a 'problem' and received further climb and heading instructions. The FO loaded all the information back into the CDU and I reengaged the automation. Received a direct to a fix on our route from ATC and continued the rest of the flight without further incident.I think we had a dual FMC failure where the left one recovered fast enough to not trigger an FMC EICAS message.
B747 flight crew reported a possible dual FMS failure during climb that resulted in a course deviation.