The cabin altitude meter and cabin pressure differential meter are part of which system?

• A. They are part of the pitot-static system.
• B. The cabin altitude meter and cabin pressure differential meter are part of the cabin pressurization system.
• C. They are part of the standby attitude system.
• D. They are part of the magnetic compass.

Answer: (B)

These two meters belong to the cabin pressurization system, which keeps the cabin at a safe and comfortable pressure as you fly at high altitudes. The cabin altitude meter shows the pressure inside the cabin translated into an altitude reading, so you know how high the cabin is effectively. The cabin pressure differential meter measures the difference between the outside air pressure and the cabin air pressure, ensuring the pressure difference stays within structural limits. This is distinct from the pitot-static system, which measures airspeed and altitude for flight instruments; the standby attitude system, which provides attitude information; and the magnetic compass, which provides heading information. Together, the cabin meters help monitor and control pressurization to protect the aircraft and passengers.