How many fixed oxygen masks are installed on the plane?

The correct answer indicates that there are 19 fixed oxygen masks installed on the plane. This number is significant as it aligns with standard safety protocols and designs for passenger aircraft, ensuring that there are enough oxygen masks for all passengers and crew in the event of a loss of cabin pressure.

In commercial aircraft, the number of oxygen masks must typically accommodate the maximum seating capacity, including additional masks for crew members. The configuration is designed so that every individual on board can access oxygen when necessary, particularly during emergencies. This ensures compliance with aviation safety regulations, which mandate that an adequate supply of oxygen is available for all on the aircraft.

Understanding the correct number of oxygen masks is crucial for flight crew and safety personnel, as it impacts emergency preparedness and response measures. Therefore, the installation of 19 masks is not only practical but also a safety standard for ensuring the wellbeing of everyone on the flight.