Assuming A 320 FLS is same as A 350 (which is very likely)
- Surely you have to make correction to DA even you fly with FLS
- Surely you have to make correction to your FAF (platform) altitude even you fly with FLS as informing ATC if you are not under ATC Radar Control
- Technically I know, there is no cold temperature limit applies if you fly with FLS provided above corrections are made, but procedurally it may be requiring, I do not remember any Regulation emphasizing this
All these above because, when airplane symbol hits magenta glide line (and simultaneously green FMS line ascends and merges with it), VD vertical scale start to indicate True Height (almost same with geometric height) and this magenta line ensures geometric clearance with terrain, but barometric height (Barometric Altitude - Threshold altitude) will always show greater than true height. This difference will reduce as descent goes on and equal to zero only at touchdown, so not zero at DA. Therefore a cold weather correction is needed at DA to ensure true height clearance (DH) when visual contact established or GA is initiated