Never heard about entering the barometric altitude in the FMS, I know of the flexible tempreture which the pilot enters to reduce the take off thrust at FLX MCT detent to increase engine life.
Flexible tempreture must always be higher than what the tempreture actually is except in hot and high conditions when it has to be the same.
It means engine power rating is reduced at international standard atmospheric temperature 15+.
Last edited by flame_bringer; 22nd June 2012 at 09:11.