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Module 11 Richard > 11.15 Oxygen > Flashcards

11.15 Oxygen Flashcards

1
Q

The international standard atmosphere is measured at what temperature and at what pressure

A

Temperature: 15 degrees Celsius
Pressure: 1013.25 hectopascal

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2
Q

What gasses does air consist of

A

Nitrogen: 78%
Oxygen: 21%
Other inert gasses:1%

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3
Q

At what altitude is the amount of usable oxygen in air halved

A

18,000ft and quartered by 33,000ft

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4
Q

A what altitude would a person be in the zone of incomplete compensation

A

Between 15,000-20,000ft

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5
Q

What type of oxygen is used on aircraft

A

Aviators breathing oxygen as it is very dry

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6
Q

What two types of oxygen should never be used on aircraft

A
  • Medical oxygen as it contains water droplets and would freeze
  • Technical oxygen as it is contaminated
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7
Q

What type of tools must be used when working with oxygen

A

Clean and oil free to prevent explosion

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8
Q

At 21’degrees c what is the maximum pressure of an oxygen bottle

A

3200psi

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9
Q

How much pressure is stored in crew oxygen bottles

A

1850psi

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10
Q

What protection device is on an oxygen bottle to prevent overpressure

A

An overpressure disk

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11
Q

How do you work out how full an oxygen bottle is

A

By knowing the pressure and temperature and referring to a chart which is usually kept near the bottles

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12
Q

What pressure or below must an oxygen bottle not be filled and why

A

50psi as moisture could have gathered in the bottle

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13
Q

What is used to prevent the danger of heat concentration on oxygen ports when topping up with oxygen

A

A thermal compensator

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14
Q

What must not be disconnected on oxygen refill poets as you would have to replace the whole component

A

The thermal compensator B-nuts

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15
Q

How is oxygen transferred to the cockpit and cabin

A

Through lines and manifolds

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16
Q

As there are usually many bottles how does it show on the cockpit as a total pressure

A

The average pressure is converted by the voltage averaging unit

17
Q

What Indicates that oxygen is flowing for the pilots and first officers emergency mask

A

A flow indicator is located on top of the box which it is stowed in and it blinks when there is oxygen flow

18
Q

How long should the flight crew take to put on their oxygen mask

A

They should be able to do it with one hand in less than 5 seconds

19
Q

What does a mask consist of

A
  • A harness
  • A face piece
  • A diluter and demand regulator
  • A microphone
20
Q

What three functions does the Diluter demand regulator have

A
  • Normal
  • 100% Oxygen
  • Emergancy
21
Q

If cabin altitude reaches what altitude does the oxygen masks deploy automatically

A

14,000ft

22
Q

How many oxygen masks are there per row

A

Always one more than there are seats, in case children are sharing with adults

23
Q

What usually activates the deployment of the oxygen masks

A

A pressure switch in the pressurised area. There is also a manual switch in the cockpit

24
Q

If oxygen masks have been deployed how must they be repacked

A

They must be re packed manually

25
Q

What is the two ways that oxygen can be supplied by the masks

A
  • Chemical system

- Gaseous system

26
Q

In the chemical oxygen system what are the stowage boxes normally called

A

Emergency Oxygen Containers (EOC)

27
Q

What does an EOC contain

A

A mask and a chemical generator which produces oxygen

28
Q

What triggers the chemical reaction in the EOC bottles

A

A striker is pulled when the mask is tightened

29
Q

What chemical is the oxygen generator filled with

A

Sodium chlorate

30
Q

At what temperature does the chemical reaction happen in the oxygen generators

A

Around 350 degrees c

31
Q

How long does an active oxygen generator generate oxygen for

A

Between 12-15 mins

32
Q

In the gaseous system what are the stowage containers called

A

Passenger Service Units (PSU)

33
Q

What are the 4 main purposes on the oxygen flow control unit

A
  • Provide a flow shut off function
  • The activate system
  • the create the pressure to push the PSU doors
  • They reduce the intermediate oxygen pressure to an adequate level for breathing
34
Q

What are the portable oxygen bottles intended for

A

Emergency or first aid

35
Q

What is the capacity and pressure of the portable oxygen bottles

A

Capacity - 11 cubic feet

Pressure - 1800 PSI

36
Q

What is the purpose of the smoke hoods on the portable oxygen bottles

A

To protect the eyes and respiratory system. They are used when fighting a fire to prevent breathing in noxious gasses

Module 11 Richard (19 decks)

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