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My advice is to learn and start on something a lot (lot) simpler, and learn how aircraft electrical systems work (via engine, APU and GPU feeds on the EICAS or similar), then understand "Bleeds" to start engines and hydraulics and you will start to get the right set ups to start and fly the aircraft, as there is no point in watching and copying a video, if you don't know what is actually going on when a switch is switched or used.
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These Boeing heavies have serious systems and you need to know your way around them and be able to interpret the system diagrams on the central EICAS Display before attempting to use them correctly. The battery is always the first thing that you switch on, so yes you will get multiple alarms as the system is confused.
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No offence Henry but you are trying to run (too fast) before you can actually walk.
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