How much supplemental oxygen for emgenerc

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How much supplemental oxygen for emgenercy descent must a pressurized turbine-powered air transport airplanes carry for each flight crewmember of flight deck duty when operating at flight altitudes above 10,000 feet?

A minimum of 2-hour's supply.

Sufficient for the duration of the flight above 8,000feet cabin pressure altitude.

Sufficient for the duration of the flight at 10,000 feet flight altitude, not to exceed 1 hour and 50 minutes.

参考答案:

A

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