Systems - Oxygen

Question 1

On the DOOR/OXY page, what changes to let the crew know oxygen pressure is getting low? And at what values?

Answer 1

What at or above 600psi the readout is green.
Below 600psi the readout pulses green.
Below 300psi the readout is amber, and “OXY” turns amber.

Below 1000psi, an amber half frame surrounds the pressure reading (on the ground only).

REGUL LO PR appears anytime pressure in the masks is low (solenoid off for ex)

Question 2

Above what altitude do the O2 masks automatically supply positive O2 pressure regardless of the EMERGENCY pressure selector position?

Answer 2

30,000ft

Question 3

Above what altitude do the O2 masks automatically supply positive O2 pressure regardless of the EMERGENCY pressure selector position?

Answer 3

30,000ft

Question 4

Above what altitude do the O2 masks automatically supply 100% O2 regardless of the N/100% rocker switch position?

Answer 4

35,000ft

Question 5

How long can a chemical O2 generator in the cabin provide oxygen for?

Answer 5

Approximately 15 minutes.