pleiades....what the? Maybe if you lose comms only.......
All aeroplanes have different systems and redundancies built in. Some models of jets when you lose your main electrics (both gens, and apu)- have maybe 30-60 mins standby power, for the standby A/Hs. Are you seriously saying that on a dark, gloomy, non- moonlit night, with a complete electrical failure (not in this case where power returned) you would press on to destination, knowing that in possibly 30 mins you may have no basic attitude instrument? (This is let alone no navigation instruments).