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> Yes, pilots have access to oxygen masks but this is a no no with fire.

Anyone know why?

I'm guessing because concentrated O2 is extremely flammable and would be fuel for a fire, when the opposite would be needed. Rapid fire-suppressant systems basically work by sucking all of the oxygen from the room/space as quickly as possible.

The flight deck O2 masks are specifically designed to provide positive pressure to avoid smoke inhalation in the event of a fire. There's no real reason not to use them - if the fire is close enough that it would matter you're already dead.

Makes sense to me. Thanks for clarification.

O2 isn't flammable and doesn't provide fuel unless the oxidant is something very electronegative like fluorine. In most fires, oxygen is the oxidizer, not the fuel.

A guess- oxygen feeds fire. I believe that on-board oxygen is not stored in tanks but rather generated as a chemical reaction on-demand, so if they don't start the O2 flow they would not risk feeding the fire.

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