Oxygen

Question 1

Minimum flight crew oxygen pressure with 2 crew based on 30 °C

Answer 1

620 psi

Question 2

Minimum flight crew oxygen pressure with 2 crew + 1 observer based on 30 °C

Answer 2

760 psi

Question 3

Minimum flight crew oxygen pressure with 2 crew + 2 observer based on 30 °C

Answer 3

940 psi

Question 4

Minimum flight crew oxygen bottle pressure covers the following:

Answer 4

‐ Preflight checks
‐ The use of oxygen, when only one flight crewmember is in the cockpit
‐ Unusable quantity (to ensure regulator operation with minimum pressure)
‐ Normal system leakage
‐ The most demanding case among the following: • Protection after loss of cabin pressure with mask regulator on NORMAL (diluted oxygen):
▪ During emergency descent for all flight crewmembers and observers for 22 min
▪ During cruise at FL 100 for two crewmembers for 98 min.
• Protection against smoke with 100 % oxygen for all flight crewmembers and observers during 15 min at 8 000 ft cabin altitude.