Why do I black out in the 737-800?

Question

There isn't an obvious was to turn on the oxygen in the 737, so I could use some help. If anybody can give me a video about this or picture, I would love it! I just keep blacking out at 10k alt, and it is pretty annoying. I hope for something better than "turn on the oxygen", because there isn't a oxygen button that I know of, that functions.

Comments

Forgot to say, but this is for the default 737-800, where the packs don't work.

Answer 1

Try setting cruise altitude knob its under the packs

Comments

Thanks! It works.