In the main cabin, how many oxygen masks per PSU are there?

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Multiple Choice

In the main cabin, how many oxygen masks per PSU are there?

Explanation:
The main idea is how oxygen is distributed at each ceiling panel (the PSU) in the cabin. In the A321, each PSU in the main cabin contains four oxygen masks. They’re arranged to serve the passengers in reach of that unit—typically two masks on each side of the aisle—so when oxygen is required, masks in that PSU deploy for up to four passengers in that zone. The system is designed this way for quick access and to fit the seating layout without excess weight or space. A smaller number wouldn’t cover all passengers who rely on that PSU, while a larger number isn’t consistent with the physical size and packing of the mask module.

The main idea is how oxygen is distributed at each ceiling panel (the PSU) in the cabin. In the A321, each PSU in the main cabin contains four oxygen masks. They’re arranged to serve the passengers in reach of that unit—typically two masks on each side of the aisle—so when oxygen is required, masks in that PSU deploy for up to four passengers in that zone. The system is designed this way for quick access and to fit the seating layout without excess weight or space. A smaller number wouldn’t cover all passengers who rely on that PSU, while a larger number isn’t consistent with the physical size and packing of the mask module.

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