Oral Prep - Passenger Oxygen

Question 1

When will passenger oxygen automatically deploy?

Answer 1

Cabin altitude >14,000 feet

Question 2

How is oxygen supplied to the passengers?

Answer 2

Chemical oxygen generators mounted in overhead compartments.

Question 3

At what cabin altitude does the amber CABIN ALT caution activate?

Answer 3

Greater than 8,500 feet, but less than 10,000 feet.

Question 4

At what cabin altitude does the red CABIN ALT warning activate?

Answer 4

Greater than 10,000 feet

Question 5

At what cabin altitude do the oxygen masks auto deploy?

Answer 5

At 14,000 feet.

Question 6

You are boarding and a FAA Inspector presents his 110-A and informs you he is going to conduct an enroute inspection. It is 20° C and the EICAS oxygen pressure is 1600 psi. What are your options?

Answer 6

First, make an entry in the DMIL that the oxygen pressure is below the requirement for 2 Crew and 1 OBS. Then the two options are to have the oxygen serviced to above the required amount, in this case 1654 psi. If no service is available or with the Dispatcher you determine the flight will be unduly delayed, the jumpseat may be deferred.