Cabin Atmosphere Flashcards
Describe the operating principle of a continuous flow oxygen system
High pressure oxygen flows from the
cylinder to the regulator where pressure is reduced and then to the mask outlets whenever the system is turned on
Describe the operating principle of a pressure demand oxygen system
oxygen flows from the cylinder to the regulator and then to the mask when the user inhales.
What should be used to purge an oxygen system of moisture
Oxygen, dry air, or dry nitrogen
What action must be taken when an oxygen system has been open to the atmosphere
Purge of any moisture
Name two different types of independent cabin air compressor
Positive displacement and centrifugal compressor
What is the source of pressurization air in most jet aircraft
Engine bleed air
What device provides the principle means of a controlling element in a cabin pressurized system
Outflow valve
What unit regulates the position of an outflow valve
Cabin pressure controller
Name several methods used on reciprocating engine aircraft for providing heated cabin air
Exhaust shroud heat exchangers, combustion heaters and electric heaters
What are the sources of ventilating air in a combustion heater
Ram air, cooling fans on the ground, or a compressor if the airplane is pressurized
Name the basic components of an air-cycle cooling system
The compressor and expansion turbine, heat exchangers, and various valves
Describe the basic operating principle that allows an air-cycle system to produce cool air
Hot engine bleed air is cooled in the primary heat exchanger and compressed and cooled again in the secondary heat exchanger. Then the air is expanded across the turbine where energy is extracted and pressure is reduced and produces a rapid temperature drop
Name the principle components of a vapor cycle system
A compressor, condenser, expansion valve and an evaporator
Describe the basic operating principles of a water separator
Cool, moist air is swirled so that water droplets are separated by centrifugal force
In what significant way way is a vapor cycle cooling system different from an air cycle system
Vapor cycle system uses Freon
Why is oil added to the refrigerant in a vapor cycle air conditioning system
Lubricate the compressor
What method is used by turbine powered aircraft for pressurization
Bleed air and engine compressor
What is the function of ventilating air in a combustion heater
Used to carry the heat to the places where it is needed
How are high and low pressure oxygen cylinder identified
High pressure oxygen cylinders are green and have AVIATORS BREATHING OXYGEN wrote on the cylinder and All low pressure oxygen cylinders are painted light yellow
How can you tell that there is carbon monoxide on the aircraft cabin
Crystals in the detector will change color
Where does the fuel used in an aircraft combustion heater come from
Aircraft fuel tanks
What maintenance is required for a combustion heater
Clean the fuel filters and check for fuel leaks
What are two types of air conditioning systems that may be installed on an aircraft
Air-cycle and Vapor-cycle
Is there any special requirement as to the type of oxygen used in an aircraft system and if so what is it
Only aviators breathing oxygen
Oxygen cylinders should have what on them
A DOT or ICC rating stamped on the bottle neck, the word AVIATION BREATHING OXYGEN and the last hydrostatic test must be stamped in the filler neck
