I'm new to this forums and i'm soory if this question had beed asked, but i can't find it.
The A330 FCOM state that
A pump, driven by Engine 1, pressurizes the blue system.
A manually-controlled electric pump can also pressurize the system.
In the event of an Engine 1 failure, in addition to a PRIM 1 or PRIM 3 loss : The BLUE ELEC
PUMP runs automatically in flight to ensure sufficient authority on the electrical rudder, thereby
counteracting the yaw sideslip induced by asymetrical thrust.
I've wonder why there is no automatically activated in yellow elec pump in case of Engine 2 failure, and PRIM 1 or 2 loss.
IMO I think that the blue one with prim 1 or 3 loss is worst case. Be cause
the rudder control said that PRIM 3 can replace PRIM 2 in case of PRIM 2 loss.
Can anyone please help me with this question.
Sorry for my English.