Usually you get an Information on the ECAM about any abnormal.
The Statuspage will be automaticily displayed after selecting Flaps one.
I'm not 100% sure but i think when on alternate braking sys the Autobreak is inop.
Edit:
After reading your Post again I thought my answer is rather less helpfull.
I think any failure in the BSCU or detected by the BSCU must be presented on the ECAM. The status page must advice that alternate Brakes are active.
I can' t think about any failure which may hide that you are losing green Brakes.
Last edited by Cityliner; 19th Sep 2007 at 21:08.
Reason: Bad Answer