10 Cabin Atmosphere Control Systems
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| An aircraft oxygen bottle may be considered airworthy if it has been hydrostatically tested and identified | with the test date, DOT number, and serial number stamped on the cylinder near the neck.
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| What test is used to determine the serviceability of an oxygen cylinder? | Pressure test with water.
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| The operation of an aircraft combustion heater is usually controlled by a thermostat circuit which | alternately turns the fuel on and off, a process known as cycling.
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| How is the cabin pressure of a pressurized aircraft usually controlled? | By an automatic outflow valve that dumps all the pressure in excess of the amount for which it is set.
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| What is ventilating air used for on a combustion heater? | Carries heat to the places where needed.
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| A contaminated oxygen system is normally purged with | oxygen
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| To be eligible for recharging, a DOT 3HT oxygen cylinder must have been hydrostatically tested every three years and be retired from service after | 24 years or 4,380 filling cycles.
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| The evacuation of a vapor-cycle cooling system removes any water that may be present by | lowering the boiling point of the water and drawing out the vapor.
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| What type of oil is suitable for use in vapor-cycle cooling system? | Special high grade refrigeration oil.
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| Where does the last stage of cooling in an air-cycle air conditioning system occur? | Expansion turbine.
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| An aircraft pressurization cycle is normally considered to be | one complete series of events or operations that recur regularly.
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| The cabin pressure control setting has a direct influence upon the | outflow valve opening.
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| One purpose of a jet pump in a pressurization and air conditioning system is to | provide for augmentation of airflow in some areas of the aircraft.
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| Before a high-pressure oxygen cylinder is serviced, it must be the correct type and have been | hydrostatically tested within the proper time interval.
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| In a high-pressure oxygen system, if the pressure reducer fails, what prevents high-pressure oxygen from entering the system downstream? | Pressure relief valve.
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| Which of the following are characteristics of a chemical or solid-state oxygen system? | A volume storage capacity about three times that of compressed oxygen and system generators that are inert below 400°F, even under severe impact.
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| Which prevents a sudden loss of pressurization in the event that there is a loss of the pressurization source? | Delivery air duct check valve.
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| What controls the operation of the cabin pressure regulator? | Cabin altitude.
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| In the diluter demand oxygen regulator, when does the demand valve operate? | When the user breathes.
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| In a freon vapor-cycle cooling system, where is cooling air obtained for the condenser? | Ambient air.
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| If a high-pressure oxygen cylinder is to be installed in an airplane, it must meet the specifications of the | Department of Transportation.
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| A pressurization controller uses | barometric pressure, cabin altitude, and cabin rate of change.
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| The point at which freon flowing through a vapor-cycle cooling system absorbs heat and changes from a liquid to a gas is the | evaporator.
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| When servicing an air conditioning system that has lost all of its freon, it is necessary to | check oil and add as necessary, evacuate the system, and add freon.
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| The air-cycle cooling system produces cold air by | extracting heat energy across an expansion turbine.
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| After cleaning or replacing the filtering element in a combustion heater fuel system, the system should be pressurized and | all connections checked for leaks.
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| The component that determines the pressure level in the cabin is the cabin air pressure | outflow valve.
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| (Refer to Figure 13.) Determine what unit is located immediately downstream of the expansion valve in a freon refrigeration system. | Evaporator coils.
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| When Refrigerant-12 is passed over an open flame, it | changes to phosgene gas.
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| The function of the condenser in a freon cooling system is to | transfer heat from the freon gas to ambient air.
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| What is the purpose of pressurizing the aircraft cabin? | To make human flight possible in the hostile environment of the upper atmosphere.
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| The purpose of a subcooler in a vapor-cycle cooling system is to | cool the freon to prevent premature vaporization.
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| On some cabin pressurization systems, pressurization on the ground is restricted by the | main landing gear operated switch.
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| What is the condition of the refrigerant as it leaves the evaporator of a vapor-cycle cooling system? | Low-pressure vapor.
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| How is the cabin pressure of an aircraft maintained in flight? | By controlling the rate of the air flowing out of the cabin.
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| What is the condition of the refrigerant as it enters the evaporator of a vapor-cycle cooling system? | Low-pressure liquid.
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| The cabin pressurization modes of operation are | differential, unpressurized, and isobaric.
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| What is the condition of the refrigerant as it leaves the condenser of a vapor-cycle cooling system? | High-pressure liquid.
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| When a vapor-cycle cooling system is not in operation, what is an indication that the system is leaking freon? | Oil seepage.
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| When purging a freon air conditioning system, it is important to release the charge at a slow rate. What is the reason for the slow-rate discharge? | Prevent excessive loss of refrigerant oil.
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| A small amount of water in a vapor cycle cooling system can freeze | in the expansion valve and stop the entire system operation.
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| Oxygen systems in unpressurized aircraft are generally of the | continuous-flow and pressure-demand types.
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| Oxygen used in aircraft systems | is at least 99.5 percent pure and is practically water free.
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| Which is considered a good practice concerning the inspection of heating and exhaust systems of aircraft utilizing a jacket around the engine exhaust as a heat source? | Supplement physical inspections with periodic operational carbon monoxide detection tests.
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| Which oxygen system employs a regulator that operates only when the user inhales? | Continuous-flow system.
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| In the combustion heater, combustion air system, what prevents too much air from entering the heaters as air pressure increases? | Either a combustion air relief valve or a differential pressure regulator.
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| For use in pressurized aircraft, which is generally the least complicated and requires the least maintenance? | Chemical oxygen generator systems.
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| If oxygen bottle pressure is allowed to drop below a specified minimum, it may cause | moisture to collect in the bottle.
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| Composite oxygen bottles that conform to DOT-E-8162 have a service life of | 15 years or 10,000 filling cycles whichever occurs first.
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| When charging a vapor-cycle cooling system after evacuation, the low-pressure gauge fails to come out of a vacuum. What is indicated? | Blockage in the system.
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| When an aircraft's oxygen system has developed a leak, the lines and fittings should be | bubble tested with a special soap solution manufactured specifically for this purpose.
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| What is the condition of the refrigerant as it enters the condenser of a vapor-cycle cooling system? | High-pressure vapor.
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| What component of a pressurization system prevents the cabin altitude from becoming higher than airplane altitude? | Negative pressure relief valve.
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| What does a steady stream of bubbles indicate when servicing a vapor cycle air conditioning system? | The system is under charged.
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| The function of the evaporator in a freon cooling system is to | lower the temperature of the cabin air.
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| How often should standard weight high-pressure oxygen cylinders be hydrostatically tested? | Every 5 years.
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| How can it be determined that a vapor-cycle cooling system is charged with the proper amount of freon? | Air bubbles in the sight glass disappear.
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| In a gaseous oxygen system, which of the following are vented to blow out plugs in the fuselage skin? | Pressure relief valves.
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| What is the purpose of a mixing valve in a compressor bleed air air conditioning system? | Control the supply of hot, cool, and cold air.
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| The basic air-cycle cooling system consists of | a source of compressed air, heat exchangers, and a turbine.
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| What component in a vapor-cycle cooling system would most likely be at fault if a system would not take a freon charge? | Expansion valve.
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| In an operating vapor-cycle cooling system, if the two lines connected to the expansion valve are essentially the same temperature, what does this indicate? | The expansion valve is not metering freon properly.
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| The point at which freon flowing through a vapor-cycle cooling system gives up heat and changes from a gas to a liquid is the | condenser.
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| If the cabin rate of climb is too great, the control should be adjusted to cause the | outflow valve to close faster.
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| Turbine engine air used for air conditioning and pressurization is generally called | bleed air.
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| The primary function of the cabin pressurization system outflow valve is to | maintain the desired cabin pressure.
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| High-pressure cylinders containing oxygen for aviation use can be identified by their | green color and the words AVIATOR'S BREATHING OXYGEN stenciled in 1-inch white letters.
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| Which best describes cabin differential pressure? | Difference between the ambient and internal air pressure.
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| What may be used as a lubricant on oxygen system tapered pipe thread connections? | Teflon tape.
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| The function of an expansion valve in a freon cooling system is to act as a metering device and to | reduce the pressure of the liquid freon.
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| Which section of a turbine engine provides high pressure bleed air to an air cycle machine for pressurization and air conditioning? | Low or high pressure compressor.
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| Frost or ice buildup on a vapor-cycle cooling system evaporator would most likely be caused by | inadequate airflow through the evaporator.
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| What unit in a vapor-cycle cooling system serves as a reservoir for the refrigerant? | Receiver-dryer.
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| Hot compressor bleed air operates the conditioned air system on some turbine aircraft, cold air supplied by the | air cycle air conditioning.
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| The primary difference between aviation breathing oxygen and other types of commercially available compressed oxygen is that | aviation breathing oxygen has had all the water vapor removed.
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| The position of the thermostatic expansion valve in a vapor-cycle cooling system is determined by temperature and pressure of the | freon in the outlet of the evaporator.
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| On transport category aircraft what might be an indication of an over pressure event of the aircraft oxygen system? | The green thermal expansion disk missing.
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| If the liquid level gauge in a vapor-cycle cooling system indicates a low freon charge, the system should | be operated for a period of time to reach a stable condition and then the freon level rechecked.
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| In what position should the bottle be placed when adding liquid freon to a vapor-cycle cooling system? | Vertical with the outlet at the bottom.
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| The purpose of the airflow metering aneroid assembly found in oxygen diluter demand regulators is to | regulate airflow in relation to cabin altitude when in diluter demand position.
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| At which component in an air-cycle cooling system does air undergo a pressure and temperature drop? | Expansion turbine.
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| What is the main cause of contamination in a gaseous oxygen system? | Moisture.
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| What component might possibly be damaged if liquid refrigerant is introduced into the low side of a vapor-cycle cooling system when the pressure is too high or the outside air temperature is too low? | Compressor
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| What controls the amount of oxygen delivered to a mask in a continuous-flow oxygen system? | Calibrated orifice.
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| What is used in some oxygen systems to change high cylinder pressure to low system pressure? | Pressure reducer valve.
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| The purpose of the dump valve in a pressurized aircraft is to relieve | all positive pressure from the cabin.
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| How should you determine the amount of oxygen in a portable, high-pressure cylinder? | Read the pressure gauge mounted on the cylinder.
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