Oxygen Systems Flashcards
What are the effects of hypoxia
Loss of night vision
Apprehension
Euphoria
False sense of wellbeing
Death
What percentages make up the gas in the atmosphere
78% nitrogen
21% oxygen
1% other gases
What occurs at 4000ft
Loss of night vision
Up to what height is ambient cabin air applicable
10000ft
What air supply is needed between 10000-33000ft?
Progressive increase in oxygen content
What air supply is needed between 33000-38000ft?
100% oxygen
What supply is needed from 38000ft and above
100% oxygen and pressure breathing
What are the 4 sources of oxygen found on aircraft
Gaseous oxygen
Liquid oxygen
Chemical/solid oxygen
On Board Oxygen Generation System (OBOGS)
How is gaseous oxygen stored
In metal canisters
What are the advantages of LOX
Expansion rate 7x greater than gaseous oxygen
Smaller and lighter system than gaseous oxygen
What colour are oxygen bottles
Black bottle with a white neck
What are the 2 systems of supplying oxygen
Continuous flow
Pressure demand
What is the disadvantage of the continuous flow system
Constantly pumping oxygen, is wasteful when low in demand
What is the NATO identification of oxygen pipelines
Green label followed by black rectangles on a white background
What are high pressure pipelines constructed of
Stainless steel or Monel Metal
What are low pressure pipelines made out of
Aluminium alloy
What 2 types of hose are used to transfer oxygen
Low pressure hose
Anti-Kink hose
Why should an oxygen system not be allowed to become completely empty
Air can enter the system carrying moisture, which can freeze pipelines and corrode the inside of the system
When is an oxygen system considered to be empty
50psi
Why is environmental conditioning needed
To deal with environmental changes at different altitudes and in different climates
What 5 conditions must be maintained in the cabin environment
Temperature
Humidity
Ventilation
Purity
Pressure
What are the effects of low temperature on the human body
Impairment of bodily functions
Drop in body temperature
Frostbite
Coma
Death
What are the effects of high temperature on the human body
Overheating
Degrading mental efficiency
Fatigue
Why must cabin humidity be controlled
Remove excess moisture to reduce risk of electronics malfunctioning
Limit rises in humidity to stop rapid exhaustion
Prevent discomfort due to dryness
Why must cabin ventilation be controlled
Prevent buildup of CO2
Prevent shitty smells
Why must cabin purity be controlled
Maintain life sustaining composition of air
Remove dust and particles from the air
What 4 systems can be used to supply air to the cabin
Engine bleed air
APU
Ground Trolley
Ram Air
What 3 systems can be used to cool air
Heat exchanger
Cooling fans
Cold Air Unit
Where are cooling fans used
as opposed to ram air, because there is no air flow when the aircraft is grounded
How does a water extractor work
Spins the air at high rpm, collecting the moisture that is displaced through centrifugal force and providing dry air on the other side
What are the 4 basic components of an air condition system
Hot air
Cold air
Mixing unit
Control unit
How are air conditioning pipes identified
Brown on grey background, followed by black circles on a white background
What type of joint is used to join pipework in the ECS system
V band couplings
What are the 2 types of v band clamps
Rigid
Segmented
What are the dangers of low and high torque loading on v band clamps
Low - coupling prone to leaking
High - over stress fasteners, causing elongation of bands and damage to v segments
Where can V-Clamp band toque loading values be found
Either etched to the band or in the specific aircraft manual
Where can system warning signs be found in the cockpit
Central Warning Panel (CWP)
Digital display screens
What is the purpose of a duct sensor
Senses variations in temperatures of air supply, protects the system at low temperatures
