The question is, WARNING - this will go in direction of
safetypee's post - what makes us feel so confident that it is the VLS that shows correct value and FMS+LDS speed is the wrong one?
- Does Airbus say the VLS could be wrong by 2-3 knots?
- How is it possible to have a difference of 3 tons (equivalent) on an aeroplane with only 30 seats filled but empty otherwise - is the true passenger weight really 176 kg each?
- What tpe of VLS to Vfms spread do you see when flying the A/C out of paint shop after IL check, with interior removed and freshly weighted?
Clear as mud ...
Bonus: What is the certified approach speed? Is it Vref = VLS?