What type of oxygen is supplied to the flight deck on the E-190?

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Multiple Choice

What type of oxygen is supplied to the flight deck on the E-190?

Explanation:
The flight deck oxygen system on the E-190 uses liquid oxygen. Liquid oxygen is stored in cryogenic dewars, and when needed it is drawn off and warmed to supply breathable oxygen to the cockpit. This approach gives a high oxygen storage density, allowing a longer, reliable supply for the flight crew without frequent changes or reliance on oxygen generators. This is different from gaseous oxygen, which is stored as gas in high‑pressure bottles and can be heavier or less space‑efficient for the same duration. Chemical oxygen generators, while common for passenger masks, provide oxygen by a chemical reaction and are not used as the primary cockpit supply. Vacuum is not an oxygen source at all.

The flight deck oxygen system on the E-190 uses liquid oxygen. Liquid oxygen is stored in cryogenic dewars, and when needed it is drawn off and warmed to supply breathable oxygen to the cockpit. This approach gives a high oxygen storage density, allowing a longer, reliable supply for the flight crew without frequent changes or reliance on oxygen generators.

This is different from gaseous oxygen, which is stored as gas in high‑pressure bottles and can be heavier or less space‑efficient for the same duration. Chemical oxygen generators, while common for passenger masks, provide oxygen by a chemical reaction and are not used as the primary cockpit supply. Vacuum is not an oxygen source at all.

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