PPRuNe Forums - View Single Post - Oxygen for the cockpit crew
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Old 5th June 2017 | 04:18
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Three Wire
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Joined: Dec 1998
Posts: 163
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From: PENang, Malaysia
The first symptom of hypoxia is the loss of colour vision by night above 10000 feet. That is why pilots need oxygen above 10000msl.

I would be very surprised if any regulator allowed 13000 feet for pilots.
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