Until someone with experience comes along - this is from the book.
All A340 flight control surfaces are electrically controlled and hydraulically actuated. There are 3 Primary flight computers & 2 secondary units. Any one computer can control the aircraft.
Loss of Electrical Control and subsequent manual reversion:
Stabilizer trim and rudder have mechanical backup. Stab
requires B or Y hydraulics to operate.
The RAT supplies pressure to the Green Hydraulic system and green
can operate an emergency generator. With RAT in operation 15-45% of normal pressure (depending on airspeed) is available. The actuation of elevators, ailerons and spoilers occurs at a reduced rate.
Green system supplies:
High Priority
Normal brakes
Flaps
Slats
Flaps WTB (wing tip brake)
Slats WTB
Yaw damper 1
#1 & #5 Spoilers
Inboard outboard ailerons
L & RH Elevator
Rudder
#1 & #4 Reversers
Low Priority
Emergency Generator
Nose Wheel Steering
Landing Gear
Many of the computer/hydraulic failure scenarios have the A340 systems doing some pretty fancy stuff. I will not attempt to describe.