Does the A310 have a RAT and what sort of stby. equipment for navigational purposes will be available when everything else goes down the drain?
Yes 300/310 got a RAT, but it's only to power yellow hyd system in case of pump low pressure.
Elec backup is either with BAT and inverter (about 30 min.) or by stby generator which is driven by green hydraulic without any time limit. Most instruments on capts side will work.
regards