How many crew masks are supplied oxygen by the crew oxygen system?

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Multiple Choice

How many crew masks are supplied oxygen by the crew oxygen system?

Explanation:
In an emergency, the crew oxygen system must instantly provide oxygen to every crew station that may need it. The A320 is equipped with four crew masks connected to this system, covering the two main flight deck seats plus the two jump-seat positions used by additional crew. So there are four masks available. This is why options with fewer than four don’t fully meet the system’s capacity, while five would exceed what is installed.

In an emergency, the crew oxygen system must instantly provide oxygen to every crew station that may need it. The A320 is equipped with four crew masks connected to this system, covering the two main flight deck seats plus the two jump-seat positions used by additional crew. So there are four masks available. This is why options with fewer than four don’t fully meet the system’s capacity, while five would exceed what is installed.

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