I am revising the systems on the 320,just a question to the A320 pilots to resume if i got it right, I seem to be confused now!!!.
the electric pump on the blue system is powered after starting both engines.
the 2 engines power the battery which powers the electric pump, ...right?
in case of 1 and 2 engine shutdown (case of contaminated fuel)or AC1 &2 lost, the RAT exits automatically.
the RAT powers the hydraulic pressure at least 2500psi, and in same time charge the batteries(the RAT has 2 function, to pressurize the blue system and load the battery).The battery make turn the electric pump which pressure the blue pressure too(???).so in this case we have the blue electrical pump and the RAT which pressurize the blue system?
when the RAT stalls below 120 knots, I have enough power for 30 minutes to power the plane in emergency mode(NAV1, VHF1, ...).in this case the battery powers the bluepump, and after 30 minutes(when batteries are dead) I loose all hydraulic pressure(so I have to be sure to be on the ground).
please, ad you comment, and correct me. thank you.
the electric pump on the blue system is powered after THE
FIRST ENGINE START!
the RAT exits automatically
when AC1 and AC2 bus are loss to energize an emergency generator !
RAT -> HYD power to BLUE -> HDY Emergen -> AC EMER
when the RAT stalls below 120 knots, I have enough power for 30 minutes to power the plane in emergency mode(NAV1, VHF1, ...).in this case the battery powers the bluepump, and after 30 minutes(when batteries are dead) I loose all hydraulic pressure(so I have to be sure to be on the ground).
NEGATIVE! Batt never power the BLUE. since 140 is fair for approach speed (see QRH). You will not fly A320 at speed 120 for 30 mins in ELEC-EMER !
Please see QRH or FCTM ELEC-EMER section will give your more what is going on here !
SIR