In Low Cab mode, which component sets the cabin altitude to the destination field elevation?

• A. The pressurization controller
• B. The altitude selector knob
• C. The cabin altitude sensor
• D. The outflow valve

Answer: (A)

The pressurization controller is responsible for setting cabin altitude to the destination field elevation in Low Cab mode. This controller uses the target altitude set by the altitude selector knob and the real-time feedback from the cabin altitude sensor to regulate the system. It commands the outflow valve (and related bleed air adjustments) to vent or retain air as needed to reach and hold the destination altitude. The altitude selector knob simply provides the target; the controller, not the sensor or valve by itself, actively drives the cabin altitude to that value.