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Old 18th March 2020 | 15:19
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ElNull
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Joined: Nov 2010
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Crew oxygen
I have 2 questions regarding crew oxygen:

Since during a preflight we put Normal/100% switch to 100%. Under what circumstances we use the Normal (air-oxygen mixture)?

also the Emergency selector states that it provide 100% under positive pressure. Does this mean it is a “continuous flow of oxygen”?

thanks
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