Don't forget that there's a difference between
B SYS LO PR and
B ELEC PUMP LO PR.
The ECAM has the condition statement: "
If blue sys lost by ELEC PUMP LO PR", so the line to deploy the RAT manually shouldn't appear. Not on the A320 any more but I remember that hydraulic ECAMs were fairly straightforward.
If I'm wrong please correct my understanding because it's been three years.
Edit: crossed with goldenrivet.
