I have looked at Flysmart and our FCOM which for old MSN CEOs gives:
320:
Flap 3 ΔVref 6
Flap Full - 0
321:
Flap 3 ΔVref 10
Flap Full not authorised
The FCOM DU is dated 9 Nov 21
On reflection it is clear there is no speed increase required on the 320 for controllability but one is clearly required on the 321. Without access to flight test data one can only hypothesise as to why.
Last edited by Jwscud; 20th March 2023 at 21:45.