Oxygen

Question 1

What happens when a pilot pushes the CREW SUPPLY pushbutton?

Answer 1

Valve opens to supply low pressure oxygen to the masks

Question 2

How does the passenger fixed oxygen system work and how long does it last?

Answer 2

Chemical oxygen generators last for approximately 15 minutes

Question 3

What does the illumination of the SYS ON light mean? Does this mean that all the masks have deployed?

Answer 3

The signal has been sent to release the oxygen mask doors, but some masks may have to be deployed manually

Question 4

What causes automatic deployment of the masks?

Answer 4

Cabin altitude reaching approximately 14,000 ft

Question 5

How is the crew oxygen mask microphone deactivated when the mask is stowed?

Answer 5

The RESET control slide will accomplish this – it does not happen automatically

Question 6

What indication would a pilot have of a crew oxygen cylinder thermal discharge?

Answer 6

The green disk on the lower left side of the forward fuselage would be missing

Question 7

Could the passenger fixed oxygen mask provide oxygen for anything other than depressurization?

Answer 7

No, unless there is a written FCOM or QRH procedure for its use

Question 8

On the ground, if there is an amber half frame around the CKPT OXY PSI box, where would you look to see if you have enough oxygen for the flight?

Answer 8

FCOM – Limitations – Oxygen

Question 9

How can a flight crew determine the flight crew oxygen pressure required for the flight?

Answer 9

FCOM – Limitations – Oxygen – Minimum Flight Crew Oxygen Pressure

Question 10

What do the minimum oxygen bottle pressure quantities guarantee?

Answer 10

Preflight checks; oxygen use by one pilot in the cockpit; system leakage; 15 mins emergency descent + 105 mins at FL100 for 2 pilots; 15 mins 100% oxygen at 8,000 ft for all