How many masks are located in the PSU per seat row?

• A. 2
• B. 3
• C. 4
• D. 5

Answer: (C)

Oxygen masks in the PSU are provided for each passenger seat in a row. When the cabin is depressurized, the masks drop so that every passenger has one. So the number of masks in a PSU per seat row equals the number of seats in that row. In this item, the row configuration has four seats, so there are four masks available for that row. If the row had a different number of seats, the mask count would match that number (two, three, five, etc.). The main idea is that mask count per row equals seat count in that row.