B777 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Flight Crew Total 8975; Flight Crew Type 2628
Aircraft Equipment Problem Less Severe
Air Traffic Control Provided Assistance; Flight Crew Returned To Departure Airport; Flight Crew Landed As Precaution; Flight Crew Requested ATC Assistance / Clarification; General Maintenance Action
Aircraft
Shortly after passing FL180 on climb out from ZZZ to ZZZZ; several status messages appeared on the EICAS. The first was 'right FMC CDU inop'. This was followed five minutes later by a 'left FMC CDU inop'. In another five minutes; a third EICAS status message appeared; 'Both left and right FMC CDU inop'. Several attempts were made to switch the FMC presentation; which resulted in a status message 'right FMC CDU failure'. After blanking on and off several times; the screen of the first officer's right CDU went blank and did not return until touchdown.After consulting with dispatch; maintenance; and the flight duty manager; it was decided a return to ZZZ was prudent. ATC was notified; flight attendants and passenger were told and we turned to return for ZZZ. Fuel dumping was accomplished; 64.2 LBS dumped so as to be below max landing weight.Landing was uneventful. Fire trucks examined the aircraft prior to gate return for residual fuel. After gate arrival; the right CDU had a hard failure; no power or screen presentation. Maintenance swapped the center CDU for the right CDU; and deferred the center. The aircraft was serviced and we proceeded to ZZZZ.
B777 Captain reported that several status messages appeared on EICAS and the First Officer's right CDU went blank.