11.15 Oxygen

Question 1

What does EU-OPS 1.760 state?

Answer 1

Operator cant operate an aircraft above 25000ft with cabin crew unless its equipped with a supply of undiluted oxygen

Question 2

What colour are oxygen bottles?

Answer 2

Green

Question 3

What type of oxygen is suitable for use in aircraft?

Answer 3

Aviator’s breathing oxygen

Question 4

What happens at 14000ft?

Answer 4

Oxygen masks are deployed

Question 5

Where are the crew oxygen bottles located?

Answer 5

Lower deck

Question 6

Where are oxygen bottles usually stored?

Answer 6

cargo compartment or Main Equipment Centre (MEC)

Question 6

What is the pressure rating for high pressure oxygen bottles?

Answer 6

1800-1850psi

Question 7

What pressure are oxygen bottles capable of maintaining up to?

Answer 7

2400psi

Question 8

What did oxygen bottles used to be made off?

Answer 8

Steel

Question 9

What are oxygen bottles now made of and why?

Answer 9

Aluminum wrapped in kevlar - lightweight

Question 10

What periodic test must oxygen bottles undergo?

Answer 10

Hydrostatic testing

Question 11

How do you figure out how full the bottle is and determine the maximum pressure for refilling?

Answer 11

Chart

Question 12

What pressure does the overpressure safety disc discharge at?

Answer 12

2600psi

Question 13

Why does every bottle need to be checked after the green safety disc discharges?

Answer 13

must find out which bottle triggered the discharge

Question 14

What is the function of the manual slow opening Shut Off Valve (SOV) and where can it be located?

Answer 14

controls oxygen flow - on the cylinder head

Question 15

What is the function of the direct reading pressure gauge and where can it be located?

Answer 15

indicates actual bottle pressure - near the filler port on the cylinder head

Question 16

What is the function of the thermal compensator and where is it located?

Answer 16

distributes heat through a brush with a large surface area - connected to the filling line

Question 17

What is the function of the overpressure burst disc and where is it located?

Answer 17

protects bottle against high pressure - connected to an overboard discharge line on the cylinder head

Question 18

What is the function of the pressure regulator and where is it located?

Answer 18

decreases oxygen pressure to a suitable value - on the cylinder head

Question 19

What is the function of the relief valve and where is it located?

Answer 19

in case pressure regulator fails - on the cylinder head

Question 20

What is the function of the filling valve and where is it located?

Answer 20

allows bottle to be refilled - on the cylinder head

Question 21

Where is portable oxygen equipment stored?

Answer 21

Cockpit & near exits

Question 22

What is portable oxygen used for?

Answer 22

emergency and first aid

Question 23

What are high pressure distribution lines made off?

Answer 23

stainless steel

Question 24

What are low pressure distribution lines made off?

Answer 24

Aluminium

Question 25

How is oxygen tubing identified?

Answer 25

Tape coding - labelled with green band stating ‘BREATHING OXYGEN’ & has white strip with black rectangles

Question 26

What is the minimum amount of time smoke hoods must work for?

Answer 26

20 mins when physically active (factor of 3)

Question 27

What is the minimum pressure for cylinders on a cart when oxygen charging?

Answer 27

50psi

Question 28

What indicates a leak exists when using a soapy liquid for oxygen leak testing?

Answer 28

Bubbles

Question 29

What are the 2 types of oxygen systems and who uses them?

Answer 29

Continuous flow (passengers & crew) & demand flow (flight crew)

Question 30

What are the 2 types of demand flow oxygen systems & what is the difference?

Answer 30

diluter demand & pressure demand (both hold back flow until user inhales but pressure demand delivers high pressure oxygen via a pressure regulator

Question 31

How can oxygen be reduced in a high oxygen pressure system?

Answer 31

2-step process & 1-step process?

Question 32

What is a 2-step process?

Answer 32

• pressure reducer reduces pressure to intermediate level
• pressure regulator reduces pressure to useable level

Question 33

How do you initiate oxygen flow in a continuous flow system?

Answer 33

Lanyard attached to mask is pulled

Question 35

What does a manual release tool do and where is it inserted?

Answer 35

Stops release of masks when flight deck operate oxygen switch - slot of PSU door

Question 36

What are the 2 supply systems?

Answer 36

chemical & gaseous

Question 37

What are the 2 types of chemical systems and which is most common?

Answer 37

portable & fully integrated supplementary oxygen system (most common)

Question 38

What are the stowage boxes known as in a chemical system & how are they deployed?

Answer 38

EOC (Emergency Oxygen Containers) - electrically by solenoid

Question 39

What activates the oxygen in a chemical system and what is it filled with?

Answer 39

oxygen generator - sodium chlorate

Question 40

What are the stowage boxes known as in a chemical system & how are they deployed?

Answer 40

PSU (Passenger Service Unit) - ring line

Question 41

What activates the oxygen in a chemical system?

Answer 41

FCU (Flow Control Unit)

Question 42

How many times can an oxygen generator be used, how can you tell its been used & can it be extinguished?

Answer 42

1 time, indicator on side of canister changes colour, no

Question 43

What can you use to verify an oxygen system is functioning?

Answer 43

Flow indicator