EMB ERJ 170/175 ER/LR
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Less Severe; Deviation - Speed All Types; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Published Material / Policy
Aircraft Equipment Problem Dissipated; Flight Crew Overcame Equipment Problem
Aircraft
Upon rotation the command bars switched to the flight director. The lateral mode switched to roll and the vertical mode went to ALT. The Autothrottles retarded and the flight director was commanding level off. I manually pushed the throttles forward and pitched the plane to approximately 15 degrees up. I asked the First Officer for heading and flight level change. We went to manual speeds as the speed schedule was not sequencing either. Once at a safe altitude and on course we went back to LNAV and VNAV. Upon decent into ZZZ1 we did not have a VNAV profile and were unable to fly the STAR as published and received guidance from ATC. About 50 miles out of SEA the VNAV profile populated.
Takeoff roll began normally; upon rotation the command bars immediately changed to the flight director; and at the same time; track mode changed to roll mode. The flight director was commanding a level off a few hundred feet above the runway; even though the altitude selector was set to 6;000 feet; the aircraft briefly entered magenta ALT hold a few hundred feet above the runway. As this happened; the Autothrottles then tried to roll back to maintain V2 + 10kts (140 kts) as though we were going to level off there. We immediately overrode the Autothrottles to continue the climb; then selected green flight level change and manual speeds at VFS. We changed LNAV and VNAV once at a safe altitude. During the brief cruise segment; just prior to descent we noted we had lost vertical PTH guidance/VNAV profile on both MFDs as well as both MCDUs. Fuel remaining at arrival; and ETA we're also missing from the MFDs. We notified ATC we didn't have VNAV guidance and requested them to descend us. About 50 miles out from ZZZ1; VNAV profile began working and we were able to resume the arrival as published.
EMB-175 flight crew reported loss of Performance/Thrust Management Computer system malfunction during takeoff rotation.