On Jan 16, 6:53*pm, wrote:

I think the A320 has a RAT for hydraulics as I doubt you can certify
an airplane that turns into a lawn dart without engine power.

I have spent much of my career working on Douglas jets and am not
nearly so familiar with Airbus. I did a bit of research yesterday.
Yes A320 has a RAT and it automatically deploys on loss of AC bus 1
and 2 which would happen if both engines lost power (and the APU was
not running). The RAT powers the hydraulic system that feeds the
primary flight controls and the slats. I think flap hydraulics are
provided by a battery driven pump when land recovery mode is selected.
If the APU was running, no electrical or hydraulic power is lost.

Unlike Douglas and I think Boeing jets, the Airbus RAT drives a
hydraulic pump and there is a hydraulic driven generator for
electical power. Douglas ADG (Air Driven Generator, DC-10, MD-10 ,
MD-11) is an electrical generator that can be used to power an
electric hydraulic pump.

Andy