Oxygen options: even if you don't routinely go to the teens or above, having some 02 available is a good idea, especially at night. Some newer, trick products ... SYSTEMS): An article from: Aviation Safety

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Citation Details
Title: Oxygen options: even if you don't routinely go to the teens or above, having some 02 available is a good idea, especially at night. Some newer, trick products make it painless.(AIRCRAFT SYSTEMS)
Author: Unavailable
Publication:Aviation Safety (Magazine/Journal)
Date: September 1, 2009
Publisher: Belvoir Media Group, LLC
Volume: 29 Issue: 9 Page: 21(3)

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