pax fixed oxygen system
chemical oxygen generators
last approximately 15 minutes
automatic deployment
approximately 14,000’ cabin altitude
What does the system on light mean?
Signal to release the masks has been sent, however some masks may need manual deployment
How is the the crew mask microphone deactivated when the mask is stowed?
The reset control slide does this. It is not automatic
How do we know if a thermal discharge of the O2 cylinder has happened?
The green disk on the forward fuselage, left side low would be missing
O2 pressure too low?
Low pressure is a possibility if the amber half frame is indicated around the PSI shown on the DOOR system page.
Refer to the FCOM limitations.
What does minimum O2 pressure guarantee?
Adequate oxygen for…
• preflight checks
• O2 use while one crewmember is out of the cockpit
• normal leakage
• Emergency use with the regulator set to NORMAL
…during 15 minutes of emergenct descent
…and 105 minutes of cruise at FL100
• Emergency use against smoke with the regulator set to 100% during 15 minutes at an 8,000’ cabin altitude.
