MASK MAN ON pb
The guard keeps this button in the AUTO position.
AUTO: The mask doors open automatically, when the cabin altitude exceeds 14 000 ft, or 16 000 ft if the HI ALT LANDING pb-sw is set to ON.
Pressed: The mask doors open.
HI ALT LANDING pb-sw
This pushbutton-switch changes the altitude threshold for the deployment of the passenger oxygen masks.
OFF: The masks drop, if the cabin pressure exceeds 14 000 ft (+ 250, -750 ft).
ON: The masks drop, if the cabin pressure exceeds 16 000 ft (+ 250, -750 ft).