What is the function of the pressurization system?

• A. Maintains cabin humidity
• B. Provides for a comfortable environment in the aircraft, also as a life support system during high altitude flights
• C. Regulates fuel flow
• D. Controls door seals

Answer: (B)

Maintaining a safe, breathable cabin pressure at altitude is the function of the pressurization system. It delivers conditioned air to the cabin and uses an outflow valve to regulate how much air escapes, keeping the cabin pressure at a level equivalent to a lower altitude (typically around 6,000–8,000 feet). This preserves the oxygen partial pressure needed for comfortable breathing and reduces the risk of hypoxia, which is essential for crew and passenger safety during high-altitude flight. It also contributes to a comfortable environment, but humidity and temperature are managed by the environmental control system, not the pressurization system. It’s not about regulating fuel flow or door seals.