Greetings
[quote]2) Brake fans, why is there a limit of 150 deg fans on and 300 fans off prior To takeoff?
[quote].
In the FCTM, Airbus tackles the brake limitations, in a very dispersed maner, they jump from classic limitation as 150 , 300 deg with brake fan ON, skydrol flash point is the idea behind it, we may think, however, at a later stage Airbus goes on by addressing brake wear, with a hot brake long life type of description, but then; and it is the troubling part , Airbus acknowledges that they cannot guaranty a sucessfull RTO at high weight, if the brake temperature is at 150 Deg!!!
I pointed out that fact to the fleet office, and up to today AIrbus never came with a recommandation.
As far as I am concerned, if octopus, in the takeoff performance computations, was stating that the limitation was VMBE, or ASDA, then I would use the brake fans, to keep the brakes as cool as possible, and for other limitation, I would apply the 150, 300 deg, for the A330, that is.
Regards