Originally Posted by
oceancrosser
Why are Airbuses operated more or less packs off for take-off?
Depends on the company.
A320 FCOM:
PACK 1 and 2........................................................... ............................................................ .AS RQRD
Consider selecting packs OFF, or APU bleed ON. This will improve performance when using TOGA thrust. In case of a FLEX takeoff, selecting packs OFF or APU bleed ON will reduce takeoff EGT, and thus reduce maintenance costs. The use of flex thrust may reduce maintenance costs. The effect is particularly significant with the first degrees of FLEX. Use of APU bleed is not authorized, if wing anti-ice is to be used.