Oxygen

Question 1

During smoke in the cockpit:

1. For Smoke, how should the Oxygen Dilutor be set?
2. How long will it last?
3. Max Cabin Altitude?

Answer 1

1. Use 100% oxygen
2. Good for flight crew and observers for 15 mins
3. Max Cabin Altitude of 8,000ft

Question 2

During an Emergency Descent:

1. During an Emergency Descent, the mask Oxygen Dilutor must be set to?
2. How long will the oxygen last for flight crew and observers?

Answer 2

1. Oxygen Dilutor: N to save oxygen. (A mix of oxygen and cabin air)
2. 13 mins

Question 3

During a cruise of FL100, how long will the oxygen last for a flight crew of two?

Answer 3

107 mins

Question 4

If the crew member is bearded, can this affect the oxygen time?

Answer 4

Yes. It may be shorter based on mask seal on face

Question 5

To compute for flight crew oxygen pressure requirements, where can we find the charts and computations?

Answer 5

Refer to the FCOM / Limitations / Minimum Flight Crew Oxygen Pressure

Question 6

When is the OXY Pressure on the SD / Door page:

Green: ?
Pulsing green: ?
Amber: ?
Amber half frame box appears: ?

Answer 6

When is the OXY Pressure on the SD / Door page:

Green: at or above 800 psi
Pulsing green: below 800 but above 400 psi
Amber: below 400
Amber half frame box appears: Below 1,500 psi and on the ground

Question 7

When does the amber OXY appear on the SD Door/OXY page?

Answer 7

When the Oxygen Crew Supply pb on the Oxygen panel is switched off

Question 8

When does the amber REGULAR LO PR on the SD Door/OXY page appear?

Answer 8

When a low pressure is detected in the circuit to the mask