FAA AMT Airframe Test 2025 – 400 Free Practice Questions to Pass the Exam

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Question: 1 / 1030

The altitude controller maintains cabin altitude by modulation of the?

Inflow valve

Outflow valve

The altitude controller manages cabin altitude by modulating the outflow valve, which adjusts the rate of air flow out of the cabin. While the outflow valve is the primary mechanism used to control cabin altitude, the other options play different roles in maintaining a safe and comfortable cabin environment. The inflow valve regulates air intake into the pressurization system, the pressure relief valve releases excess pressure in the event of an over-pressurization, and the emergency vent provides a backup escape route for air in case of emergencies. However, these valves do not directly control cabin altitude like the outflow valve does. Therefore, B is the best answer.

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Pressure relief valve

Emergency vent

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