CREW SUPPLY pb
This pushbutton controls the solenoid valve.
- ON : The valve is open, and supplies low pressure oxygen to the masks (normal position in flight).
- OFF : The valve is closed, and the white light comes on.
PASSENGER SYS ON light
This light comes on in white, when the control for the oxygen mask doors is activated, and it remains on until the TMR RESET pb is pressed.
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.