At what cabin altitude is oxygen required to be used at all times?

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Prepare for the Federal Aviation Regulations (FAR) 135 Test with engaging flashcards and multiple-choice questions. Each question offers hints and explanations to help you succeed. Get ready for your aviation exam!

Multiple Choice

At what cabin altitude is oxygen required to be used at all times?

Explanation:
Oxygen must be used continuously once cabin altitude reaches 12,000 feet. As you climb, the air’s oxygen content becomes insufficient to maintain normal brain function, so hypoxia can occur even without obvious symptoms. The rule requires flight crew to use or have continuous oxygen whenever the cabin is at or above that level, to keep performance and safety intact. Higher altitude rules exist for passengers and for longer exposures, but the 12,000-foot threshold is the point at which continuous oxygen use by the crew becomes mandatory.

Oxygen must be used continuously once cabin altitude reaches 12,000 feet. As you climb, the air’s oxygen content becomes insufficient to maintain normal brain function, so hypoxia can occur even without obvious symptoms. The rule requires flight crew to use or have continuous oxygen whenever the cabin is at or above that level, to keep performance and safety intact. Higher altitude rules exist for passengers and for longer exposures, but the 12,000-foot threshold is the point at which continuous oxygen use by the crew becomes mandatory.

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