Can anyone explain to me why it is not feasible for Airbus to build some sort of gross error check for take-off acceleration into the FMS?
The FMC already has all the required data: Temperature, air pressure, N1, entered or calculated wind component etc. Knowing all this surely it would be a simple matter for the FMC to calculate the expected acceleration for the entered TOW. This could be compared to the INS / ADIRU (or whatever its called on the bus) acceleration, and the pilots alerted to any gross discrepancy.
Or am I missing something?