Originally Posted by sebxl
Do not forget that when you activate the app phase, the FMGC computes speed at present weight (for ex 63.2 t) then when you do the go around, your weight will be different maybe 300 or 400 kgs depending when you activate the app phase. So your speed will be slighty different (1 or 2 kts) no more.
[EDIT]You are quite correct but that was not the question asked.
Westinghouse, you're spot on for the F speed discrepancy between APPR and GO AROUND phase (F speed of GA phase being about 15 kts higher than the APPR one IIRC)
I personally don't have a definitive answer but as previously stated, I think this is the 14% increase mentioned in FCOM 3.4.10 p1.
If that is the case, when in CONF 3, your GA F speed should then be only 4% higher than your APPR one...
Without being absolutely sure, I think it has to do with approach and landing climb gradient/certification stuff...Sorry for not being more specific.