Oxygen Systems

Question 1

What are the effects of hypoxia

Answer 1

Loss of night vision
Apprehension
Euphoria
False sense of wellbeing
Death

Question 2

What percentages make up the gas in the atmosphere

Answer 2

78% nitrogen
21% oxygen
1% other gases

Question 3

What occurs at 4000ft

Answer 3

Loss of night vision

Question 4

Up to what height is ambient cabin air applicable

Answer 4

10000ft

Question 5

What air supply is needed between 10000-33000ft?

Answer 5

Progressive increase in oxygen content

Question 6

What air supply is needed between 33000-38000ft?

Answer 6

100% oxygen

Question 7

What supply is needed from 38000ft and above

Answer 7

100% oxygen and pressure breathing

Question 8

What are the 4 sources of oxygen found on aircraft

Answer 8

Gaseous oxygen
Liquid oxygen
Chemical/solid oxygen
On Board Oxygen Generation System (OBOGS)

Question 9

How is gaseous oxygen stored

Answer 9

In metal canisters

Question 10

What are the advantages of LOX

Answer 10

Expansion rate 7x greater than gaseous oxygen
Smaller and lighter system than gaseous oxygen

Question 11

What colour are oxygen bottles

Answer 11

Black bottle with a white neck

Question 12

What are the 2 systems of supplying oxygen

Answer 12

Continuous flow
Pressure demand

Question 13

What is the disadvantage of the continuous flow system

Answer 13

Constantly pumping oxygen, is wasteful when low in demand

Question 14

What is the NATO identification of oxygen pipelines

Answer 14

Green label followed by black rectangles on a white background

Question 15

What are high pressure pipelines constructed of

Answer 15

Stainless steel or Monel Metal

Question 16

What are low pressure pipelines made out of

Answer 16

Aluminium alloy

Question 17

What 2 types of hose are used to transfer oxygen

Answer 17

Low pressure hose
Anti-Kink hose

Question 18

Why should an oxygen system not be allowed to become completely empty

Answer 18

Air can enter the system carrying moisture, which can freeze pipelines and corrode the inside of the system

Question 19

When is an oxygen system considered to be empty

Answer 19

50psi

Question 20

Why is environmental conditioning needed

Answer 20

To deal with environmental changes at different altitudes and in different climates

Question 21

What 5 conditions must be maintained in the cabin environment

Answer 21

Temperature
Humidity
Ventilation
Purity
Pressure

Question 22

What are the effects of low temperature on the human body

Answer 22

Impairment of bodily functions
Drop in body temperature
Frostbite
Coma
Death

Question 23

What are the effects of high temperature on the human body

Answer 23

Overheating
Degrading mental efficiency
Fatigue

Question 24

Why must cabin humidity be controlled

Answer 24

Remove excess moisture to reduce risk of electronics malfunctioning
Limit rises in humidity to stop rapid exhaustion
Prevent discomfort due to dryness

Question 25

Why must cabin ventilation be controlled

Answer 25

Prevent buildup of CO2 Prevent shitty smells

Question 26

Why must cabin purity be controlled

Answer 26

Maintain life sustaining composition of air Remove dust and particles from the air

Question 27

What 4 systems can be used to supply air to the cabin

Answer 27

Engine bleed air APU Ground Trolley Ram Air

Question 28

What 3 systems can be used to cool air

Answer 28

Heat exchanger Cooling fans Cold Air Unit

Question 29

Where are cooling fans used

Answer 29

as opposed to ram air, because there is no air flow when the aircraft is grounded

Question 30

How does a water extractor work

Answer 30

Spins the air at high rpm, collecting the moisture that is displaced through centrifugal force and providing dry air on the other side

Question 31

What are the 4 basic components of an air condition system

Answer 31

Hot air Cold air Mixing unit Control unit

Question 32

How are air conditioning pipes identified

Answer 32

Brown on grey background, followed by black circles on a white background

Question 33

What type of joint is used to join pipework in the ECS system

Answer 33

V band couplings

Question 34

What are the 2 types of v band clamps

Answer 34

Rigid Segmented

Question 35

What are the dangers of low and high torque loading on v band clamps

Answer 35

Low - coupling prone to leaking High - over stress fasteners, causing elongation of bands and damage to v segments

Question 36

Where can V-Clamp band toque loading values be found

Answer 36

Either etched to the band or in the specific aircraft manual

Question 37

Where can system warning signs be found in the cockpit

Answer 37

Central Warning Panel (CWP) Digital display screens

Question 38

What is the purpose of a duct sensor

Answer 38

Senses variations in temperatures of air supply, protects the system at low temperatures