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M11 > 11.15 Oxygen > Flashcards

11.15 Oxygen Flashcards

1
Q

What does EU-OPS 1.760 state?

A

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

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2
Q

What colour are oxygen bottles?

A

Green

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3
Q

What type of oxygen is suitable for use in aircraft?

A

Aviator’s breathing oxygen

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4
Q

What happens at 14000ft?

A

Oxygen masks are deployed

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5
Q

Where are the crew oxygen bottles located?

A

Lower deck

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6
Q

Where are oxygen bottles usually stored?

A

cargo compartment or Main Equipment Centre (MEC)

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6
Q

What is the pressure rating for high pressure oxygen bottles?

A

1800-1850psi

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7
Q

What pressure are oxygen bottles capable of maintaining up to?

A

2400psi

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8
Q

What did oxygen bottles used to be made off?

A

Steel

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9
Q

What are oxygen bottles now made of and why?

A

Aluminum wrapped in kevlar - lightweight

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10
Q

What periodic test must oxygen bottles undergo?

A

Hydrostatic testing

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11
Q

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

A

Chart

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12
Q

What pressure does the overpressure safety disc discharge at?

A

2600psi

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13
Q

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

A

must find out which bottle triggered the discharge

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14
Q

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

A

controls oxygen flow - on the cylinder head

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15
Q

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

A

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

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16
Q

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

A

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

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17
Q

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

A

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

18
Q

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

A

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

19
Q

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

A

in case pressure regulator fails - on the cylinder head

20
Q

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

A

allows bottle to be refilled - on the cylinder head

21
Q

Where is portable oxygen equipment stored?

A

Cockpit & near exits

22
Q

What is portable oxygen used for?

A

emergency and first aid

23
Q

What are high pressure distribution lines made off?

A

stainless steel

24
Q

What are low pressure distribution lines made off?

A

Aluminium

25
Q

How is oxygen tubing identified?

A

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

26
Q

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

A

20 mins when physically active (factor of 3)

27
Q

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

A

50psi

28
Q

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

A

Bubbles

29
Q

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

A

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

30
Q

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

A

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

31
Q

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

A

2-step process & 1-step process?

32
Q

What is a 2-step process?

A
  • pressure reducer reduces pressure to intermediate level
  • pressure regulator reduces pressure to useable level
33
Q

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

A

Lanyard attached to mask is pulled

34
Q
A
35
Q

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

A

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

36
Q

What are the 2 supply systems?

A

chemical & gaseous

37
Q

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

A

portable & fully integrated supplementary oxygen system (most common)

38
Q

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

A

EOC (Emergency Oxygen Containers) - electrically by solenoid

39
Q

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

A

oxygen generator - sodium chlorate

40
Q

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

A

PSU (Passenger Service Unit) - ring line

41
Q

What activates the oxygen in a chemical system?

A

FCU (Flow Control Unit)

42
Q

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

A

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

43
Q

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

A

Flow indicator

M11 (11 decks)

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