This is cut and pasted from my e-fcom 3.03.16 p2 rev 36
Note that rev 37 is published and will be available soon!
Check or modify the landing configuration. Always select the landing configuration on the PERF APP page :
The pilot may choose FLAP 3 rather than FLAP FULL for landing, depending on the available runway length and go-around performance, or if windshear/severe turbulence is considered possible on the approach.
The ECAM may require landing in configuration 3, in case of a system failure :
First read the VLS CONF FULL value on the PERF APP page to determine the VAPP (or use QRH 2.31).
Then, select CONF 3 on the PERF APP page.
As a general rule, managed speed can be used if the landing configuration and the configuration selected on the PERF APP page are the same. (If they are not the same, the managed speed will not drop down to the approach speed).
Check VAPP according to the FLAPS FULL or FLAPS 3 selection on the MCDU.
The pilot can modify VAPP. The new value will be taken into account for ground speed mini-function.
Note : If some abnormality requires a speed increment for the approach, the increment must be added to VLS CONF FULL