Loss of both main generators will (providing the green hydraulic is operating) trigger the STBY GEN to operate. The normal GREEN HYD systems are ‘lost’ in favour of running the STBY GEN. One of the first check list items will be to select the PTU ON in order to support the STBY GEN.
With the a/c now at the ESSENTIAL POWER level, the fun start! Amongst the joys to come are EMGY GEAR lowering, use of the STBY GEAR indicator lights, no airbrake, yellow spoilers only, loss of nose-wheel steering, half speed flaps, and calculating landing distance required.