What additional failsafes are included in the pressurization system?

The inclusion of two pneumatic non-return valves for negative pressure conditions serves an important role in maintaining the integrity of the aircraft's pressurization system. These valves are designed to prevent the reverse flow of air that could occur in the event of a depressurization scenario. By ensuring that there is no unintended loss of cabin pressure, these non-return valves enhance safety for passengers and crew, maintaining a consistent and safe cabin environment, even under adverse conditions.

The presence of these valves in the system is crucial, particularly in high-altitude flights where maintaining cabin pressure is necessary for passenger comfort and safety. When negative pressure conditions threaten the integrity of the cabin, these valves effectively act to counter that risk, playing a critical role in the overall safety and reliability of the aircraft's pressurization system.