Quote:
"Packs off is the manufacturer's SOP. (In Airbus' case anyway.)"
If you review the Airbus A318/319/320/321 FCOM Section PRO-NOR-SOP -11 P 1/2, you will see that the above comment is incorrect!
The Airbus Pack procedure as listed in the SOP - "Before takeoff" is: Packs 1 and 2 ....... AS REQD