Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Flight Crew Last 90 Days 18.62; Flight Crew Total 3810.95; Flight Crew Type 537.13
Situational Awareness
Aircraft Equipment Problem Critical; Deviation - Track / Heading All Types
Flight Crew Overcame Equipment Problem
Aircraft
Aircraft status CCS RDC 8 AFT EE BAY - CCS Remote Data Concentrator 8 failed. Noted IRU L drift delta value increasing to 4.2. Initiated Unreliable Nav checklist and began Post Position plotting. Plot confirmed we were on course with LNAV/Vnav active modes; ANP 0.03 GPS updating. ATC requested us to confirm back on route. Earlier; other crew pair requested and received left 40nm weather deviation at [time] and reported back on route at [51 minutes later].Confirm Assigned Route.NFFF ATC message: ADS indicates that you're approx. 40 miles right of route. We confirmed ON Route cross track error 0.0 GPS updating with ANP 0.03. NFFF ATC message: ADS still showing deviation slightly right of route. (We still showed on course with ANP 0.03.) EICAS: Elec Gen Off R2 followed by Pack R alerts. Also had Heat Pitot C and No Land 3 EICAS which cleared up with Gen and Pack resolutions. (Heat Pitot C remained as a Status message). Noted HDG HOLD roll mode with power interruption; Returned to LNAV.Completed both checklists restoring Gen with R2 Gen CTRL reset per the non-normal and Pack restored using Air Condition Reset per the non-normal checklist. Flight attendants informed/briefed about air and electric issues and normal systems restored. Consulted [Maintenance Control] through Dispatch and talked to 787 Fleet Management via SAT phone.IRU L continued to show drift up to 4.9nm and IRU R had no values. GPS was updating and ANP remained 0.03. Confirmed with Brisbane ADS B position showed us on route. Suspect ADS data earlier was erroneous due to non-normals experienced. ANP with the GPS updating never exceeded 0.03 and we remained on magenta line in LNAV/Vnav.Excellent crew CRM!
Boeing Pilot reported navigational problems.