Yes, Putting an Emergency Oxygen Mask on First Is Vital

Investigators looking into the October 25, 1999 crash of Learjet 35 were faced with a puzzling question: If the supplemental oxygen was working, why didn't the crew use their masks as soon as they ran into trouble?

From the Series: Air Disasters: Deadly Silence http://bit.ly/2AZuQ48


Source: Smithsonian Channel, https://www.youtube.com/watch?v=gIiXQKMkcJk
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