Which statement is true about the locations of drop-down masks?

• A. They are located in the PSU per seat row, in the toilets, and above each main door
• B. They are located only in the PSU
• C. They are located only in the toilets
• D. They are located only above the main doors

Answer: (A)

Drop-down oxygen masks are part of the system that keeps people breathing during a depressurization, and they’re placed in multiple locations to make sure everyone can access them quickly. They appear in the Passenger Service Units above each seat so seated passengers can reach them, in the toilets so someone in the lavatory isn’t left without air, and above each main door so crew and passengers near the doors have immediate access as they move through the cabin. Because the oxygen supply needs to be available throughout the cabin, having masks in all three locations is the correct and most practical setup.