1. Pressing the fire button will cut off the engine driven hydraulic pump, but there is an accumulator in each system which will retain some pressure.
2. APU Will give electric power, therefore Yellow system electric pump and PTU will give the Green system.
3. Remember the British Airways flight which flew through volcanic ash and lost all four engines. The crew did everything they could and didn't give up, they got back on the ground.
4.Point of the thread, could he have done things differently, what would I have done in that situation, what can we LEARN from this.
Now a question from me, QRH hydraulic architecture diagram shows Blue system supplies Flaps, yet FCOM 3 states loss of flaps in this situation. Are the demands on the Blue system too great to supply the flaps as well so the priority valves isolate them or is there another reason ?