Oxygen

Question 1

Where can o2 pressure be read?

Answer 1

MFD ‘STATUS’ page (corrected for temperature)

At the o2 cylinder panel (un-corrected for temperature)

Question 2

Do the cockpit crew and the passengers share the same emergency oxygen?

Answer 2

No, the cockpit crew uses an o2 cylinder.

Cabin passengers use o2 chemical generators

Question 3

Once the Passenger Chemical o2 generators are started can they be shutoff?

Answer 3

No

(12 minutes of Oxygen Available)

Question 4

What is the minimum o2 for a cockpit crew?

Answer 4

2 crew “Blue for 2”
3 crew “Green for 3”

Displayed on Status Page.
Normal pressure 1850 PSI @ 70 degrees F

Question 5

What activates when the flight deck o2 masks are removed from their storage unit?

Answer 5

• Flow of o2
• Mask microphone
• Flight deck speakers

Question 6

What happens if the TEST/RESET button is pressed while flight deck o2 masks are not stowed?

Answer 6

• Stops flow of o2
• Deactivates mask microphone
• Deactivates flight deck speakers

Question 7

What type of oxygen will the quick-donning cockpit crew masks provide?

Answer 7

Emergency: Pure oxygen with positive pressure.

100% Pure oxygen at all altitudes.

Normal: Oxygen/air mixture (ratio depends on cabin altitude)

Masks are designed to be donned within 5 seconds.

Question 8

During pre-flight how would you know if the cockpit crew o2 has been overpressurized?

Answer 8

The green blow-out disc would be missing on the forward right side of the fuselage

Question 9

What is the o2 duration for the following?
Passenger
Flight Attendant
PBE

Answer 9

Passenger o2: 12 min Chemical generators in PSU’s

Flight Attendant cylinder: 30 minutes, 2 on-board.

PBE: 15 minutes, 4 on-board (1 cockpit/3 cabin)

Question 10

When will the passenger o2 masks automatically deploy?

Answer 10

Cabin altitude of 14,000-14,700ft. Seatbelt and PED signs illuminate.

Caution EICAS msg: ‘PAX OXY NOT DEPLOYED’
-IF- masks don’t auto-deploy, crew can select OVRD.

Question 11

Can the o2 door dispensing units be opened manually if it fails to automatically deploy?

Answer 11

Yes, via the Manual Release Tool (MRT) located at each FA station.

Question 12

What does the PBE provide?

Answer 12

Pressurized o2 and protection from smoke, fire and fumes up to 41,000ft. for at least 15 minutes.

• Blue indication: Good
• Pink indication: Bad
• Vacuum loss: Bad (even with a blue indication)

Question 13

How many portable o2 cylinders are installed in the cabin?

Answer 13

2, one in the FWD section and one in the AFT section.
2 masks per cylinder
30 minutes of oxygen