Originally Posted by
Iceman49
Isn't the approach speed 5 knots faster than Vls...whether or not a/t is used, are you saying you are flying the approach at Vls?
You could. The +5 kt increment to Vref to calculate Vapp by FMS is added because it is assumed A/THR will be used. If you don't and calculate Vapp manually with 0 headwind you should find out that Vapp = Vref + 0 = Vls.
FD (the un-real)