"When landing gear down"
Reference the previous few posts. FCOM 3.3.18.
Intermediate/Final approach,(ILS entered in flight plan)
" When Flaps at 2, Gear Down"
"When Landing Gear Down, Select Flaps 3"
This is from the Airbus manuals aboard our aircraft anyway.
My own input would be that although the Gear itself maybe assisted by gravity on extension, those main gear doors are still quite large and it must be a fair load on the green system to close them.
Food for thought.