Why do pilots start the second engine first?

I always seem to see pilots start the 2 engine first. Why do they do this

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I believe it’s because the second engine powers all the electrical systems and the APU, but I’m not too sure.

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The apu starts the second egeine

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Ah, then maybe it has to do with the way the gas pipes are aligned or possibly the hydraulic system?? You will have to have a real pilot answer this. πŸ˜‚πŸ€”

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Because they count backwards, jk:-)

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Do it to comply with manuals and allows for aircraft performance in regards to bleed air/packs and also allowing for ground safety if bags are still being loaded and such from my knowledge.

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Thank you for your answer. But what about airbus?

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Not quite sure, but from my guess it would be for the same reason.

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Engine #2 powers the hydraulics which allows you to steer and taxi on one engine (where applicable). Otherwise you would have to start #1 and then start the hydraulic pumps just to taxi.

Thanks to IFATC Jared for the useful information!

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Google it next time. ;)