OMA 8.8 Oxygen

Question 1

Flight crew oxygen
Where, what, how much

When is supplementary oxygen needed

Answer 1

Mask within easy reach
Quick-donning if ops over FL250
Sufficient for full descent to 10,000
Minimum 2 hours

Supplementary if more than 30 mins when cabin above 10 000 ft, or whenever above 13 000 ft

Question 2

Cabin crew oxygen
Where should masks be if ops over FL250? How long does oxygen last?

Answer 2

Sufficient spare masks distributed throughout cabin

Sufficient for any descent to 13,000 ft
Minimum 30 mins

Question 3

Passenger oxygen
How many masks if operating above FL250?
How long should oxygen last?

How many passengers can have oxygen between 14-15 000 ft?

And between 10-14 000 ft?

Answer 3

One mask per passenger
+ 10% the number of seats

For full descent to 15,000 ft
Minimum 10 mins

30%

10%

Question 4

Undiluted first aid oxygen
When required?
For how many passengers?
For above what altitude?

On A320, how many litres gives no limitation on bottles?

What is the flow rate required above 8,000 ft?

Answer 4

For ops over FL250
2% or minimum 2 passengers
8 000 ft

750 𝓁

3𝓁 / min
Must be variable between 2-4 𝓁 / min

Question 5

What altitude do we descend to in a depressurisation?

Answer 5

10,000 ft or MSA
Whichever higher

No smoking sign whenever oxygen in use

Question 6

How long should breathing equipment last that covers the eyes mouth and nose?

Why do Flight Crew require a portable one?

Where should Cabin Crew PBEs be located?

Answer 6

15 mins

For ops without cabin crew

Next to duty stations, plus one in cabin if more than 7 seats. Located adjacent to extinguisher (but outside if in cabinet)