C441 pressurization

Q: With the pressurization source on and cab alt set no matter what I do the cabin will only climb and not pressurize...what am I doing wrong?

A: Make sure that you have the cabin vent lever in and the red cover down on the pressurization panel.
In order to pull in the cabin vent lever, you must have selected a different mode than off on the press source, the cabin press switch up and the red cover closed.

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