Crew oxygen is supplied from one cylinder. A green over
pressure disk is located on the outside of the aircraft skin below the Captains
windows. Blowout of this green disk indicates thermal discharge. Crew oxygen is
turned on using a pb in the overhead panel. Crew oxygen pressure is indicated
on the SD and if low the pressure indication will have a half amber box around
it. However, the Airbus low pressure is not the same as the US Airways limit,
therefore the half amber box should be ignored and crew action to check
pressure is not required until pressure is less than 1000 psi. A chart is
available on PH pg. 3-34 to indicate amount needed for number of crewmembers.
Masks are full-face and have clear “tear-off” strips. If face mask has surface contamination, the tear-off strip can be
removed to clear an area to see through.
Passenger oxygen is chemically generated. Passenger oxygen
is located at passenger seats, lavs, galleys and at each F/A station with 2, 3
or 4 masks to a group. Masks will automatically deploy when cabin altitude
exceeds 14,000’. May be manually deployed by pilot using red guarded MASK MAN
ON pb. Oxygen generators last approximately 13 minutes after first mask in
group is used. Passenger oxygen SYS ON light only means that the signal was
sent, some masks may not deploy and F/A’s may have to manually open some doors.