OXYGEN REQUIREMENTS

Question 1

What are the oxygen requirements on board for a flight between FL 100 and FL 250?

Answer 1

Pax :
For 100% of pax for the duration cabin altitude exceeds 12’000 ft, minimum of 10 min
For 10% of pax for the duration that the cabin exceeds 10’000 ft, minimum 30 min

Flight Crew:
For the duration the cabin exceeds 10’000 ft, minimum 30 min

Cabin Crew:
Same as for flight crew

Question 2

What are the oxygen requirements on board for a flight above FL 250?

Answer 2

Pax:
* 100% of Pax above 15’000 ft, minimum 10 min
* 30% of Pax between 12’000 - 15’000 ft
* 10% of Pax between 10’000 - 12’000 ft
* First aid O2 for 2% of Pax or two Pax, whichever is greater, for the entire time the cabin altitude exceeds 8’000 ft following a decompression

Flight Crew:
For the duration the the cabin exceeds 10’000 ft, minimum 2h

Cabin Crew:
For the duration the cabin exceeds 10’000 ft + an individual portable supply for 15 min

Question 3

When shall Flight Crew use oxygen masks?

Answer 3

At all times cabin altitude exceeds 10’000 ft

Question 4

When shall Cabin Crew use oxygen masks?

Answer 4

At all times cabin altitude exceeds 14’000 ft

Question 5

When shall Pax use oxygen masks?

Answer 5

Pax masks shall be activated and should be used whenever the cabin altitude exceeds 14’000 ft

Question 6

What is considered a “safe cabin altitude” for passengers?

Answer 6

Below 14’000 ft oxygen masks are not required to be worn

Question 7

What should be checked when there is one pilot on the flight deck?

Answer 7

1. The quick donning mask is ready
2. Flight deck speaker shall be ON and volume checked

Question 8

What are the 3 modes on the Flight Crew oxygen masks and what are the differences?

Answer 8

1. Normal
2. 100%
3. Emergency

Question 9

When would you use the “Emergency” mode on an oxygen mask?

Answer 9

Emergency mode is used to provide 100-percent oxygen under constant pressure. This limits inhalation of any cockpit smoke or noxious fumes.

Question 10

What is the difference between the “Normal” and “100%” modes on an oxygen mask?

Answer 10

“100%” puts in 100% oxygen
“Normal” mode preserves oxygen supply by regulating the percentage (flow) of oxygen depending on cabin altitude. Typically, above about 32,000 feet the two modes are identical, as there is no dilution—but at lower altitudes, oxygen savings may be considerable.