EMB ERJ 170/175 ER/LR
Flight Crew Air Transport Pilot (ATP)
Confusion; Human-Machine Interface
Aircraft Equipment Problem Critical
Flight Crew Overcame Equipment Problem
Aircraft; Software and Automation
First flight in Aircraft X. We programmed the FMS with the intended runway for departure. Upon taxi clearance; we had a runway change of [Runway] XX. When we changed the runway the FMS deleted our fixes in between our departure and arrival. We proceeded to program the FMS again with all fixes and found no further issues. Next issue was our following flight from ZZZ1 to ZZZ2. We programmed landing into ZZZ RNAV Y XXL. Instead of showing the landing runway on FMS and MFD; it showed the missed approach point of ZZZZZ. Once reaching that point; two EICAS messages displayed. Vertical mode off and lateral mode off appeared with no FMA modes active. We also lost guidance from ZZZZZZ to the runway. We are unsure if in a missed approach guidance would be active if needed. Once we landed the EICAS messages went away and no further issue. Programming the FMS [for the next flight]; performance data showed us landing with 4;100 lbs of fuel. Once we started engine 2; we received a message to check fuel reserve with indicated landing fuel of 2;500 lbs. We stopped at hold short line of Runway XXL to further diagnose. We found the climb page showing us climbing at a speed of 138 knots (V2) to TOC (top of climb). This showed us taking a total of 43 minutes to TOC; which should have been 20 minutes. We tried to program the climb speed and switch to manual to see if it would recalculate but it did not work. We were above our planned fuel and calculated our fuel burn manually to find we would be safe to begin the flight. Once we advanced our power; it recalculated our landing fuel to our projected 4;100 lbs. No other issues came of this flight.
Flight Crew flying EMB175 aircraft reported multiple issues with the Flight Management System.