All,Does the 800/900 FMC still do the auto V1, Vr, and V2 calculations like. I can program the 600/700 FMC and it does it fine, but do the saem programming in the 800/900 and hitting the buttons doesn't fill in the fields automatically??Any ideas. Thanks in advanceSteve Brown

Hi Steve,Assuming you have entered all the required data (INIT REF, TO flaps etc) is your aircraft within maximum take-off weight limits? I had this problem before and it turned out I'd forgotten to check fuel/load and it was too heavy.Best,Martijn