Originally Posted by
iggy
I was a fan of switching in the yellow electric hydraulic pump when on the APU during an emergency landin with both engines flame out (only in the sim!)
I remember someone in the forum posting the official reply from airbus for the matter, which replied that not only the liquid is less than required to operate heavy users on the yellow, but the operation would be questionable, and unpredictable when deploying high lift devices as the leak measurement valves would run out of pressure locking them into unpredictable intermediate positions