Originally Posted by
JSprague24
There's a JustPlanes cockpit ridealong in a Challenge 757 which came out in the late 1990s in which the first segment is MIA-LPB. Prior to arrival (and again just after takeoff to UIO), the pilots don oxygen masks and set the cabin pressure altitude to 13,000 feet. I knew the reasons to go on oxygen given that scenario, but never fully understood why they were setting the cabin altitude to that point (assuming some sort of procedure to adjust to the high altitude?) .
Most aircraft fo not allow landings with tha cabin pressurized beyond a minimal amount for structural reasons. Normal max is usually 8.4 PSI. Landing max .125 PSI. To land at a 13,000 foot airport you need the cabin altitude to be 13,000.