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An aircraft oxygen bottle may be considered airworthy if it has been hydrostatically tested and identified
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What test is used to determine the serviceability of an oxygen cylinder?
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10 Cabin Atmosphere
10 Cabin Atmosphere Control Systems
| Question | Answer |
|---|---|
| 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. |
| What test is used to determine the serviceability of an oxygen cylinder? | Pressure test with water. |
| 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. |
| 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. |
| What is ventilating air used for on a combustion heater? | Carries heat to the places where needed. |
| A contaminated oxygen system is normally purged with | oxygen |
| 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. |
| 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. |
| What type of oil is suitable for use in vapor-cycle cooling system? | Special high grade refrigeration oil. |
| Where does the last stage of cooling in an air-cycle air conditioning system occur? | Expansion turbine. |
| An aircraft pressurization cycle is normally considered to be | one complete series of events or operations that recur regularly. |
| The cabin pressure control setting has a direct influence upon the | outflow valve opening. |
| 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. |
| Before a high-pressure oxygen cylinder is serviced, it must be the correct type and have been | hydrostatically tested within the proper time interval. |
| In a high-pressure oxygen system, if the pressure reducer fails, what prevents high-pressure oxygen from entering the system downstream? | Pressure relief valve. |
| 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. |
| Which prevents a sudden loss of pressurization in the event that there is a loss of the pressurization source? | Delivery air duct check valve. |
| What controls the operation of the cabin pressure regulator? | Cabin altitude. |
| In the diluter demand oxygen regulator, when does the demand valve operate? | When the user breathes. |
| In a freon vapor-cycle cooling system, where is cooling air obtained for the condenser? | Ambient air. |
| If a high-pressure oxygen cylinder is to be installed in an airplane, it must meet the specifications of the | Department of Transportation. |
| A pressurization controller uses | barometric pressure, cabin altitude, and cabin rate of change. |
| 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. |
| 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. |
| The air-cycle cooling system produces cold air by | extracting heat energy across an expansion turbine. |
| After cleaning or replacing the filtering element in a combustion heater fuel system, the system should be pressurized and | all connections checked for leaks. |
| The component that determines the pressure level in the cabin is the cabin air pressure | outflow valve. |
| (Refer to Figure 13.) Determine what unit is located immediately downstream of the expansion valve in a freon refrigeration system. | Evaporator coils. |
| When Refrigerant-12 is passed over an open flame, it | changes to phosgene gas. |
| The function of the condenser in a freon cooling system is to | transfer heat from the freon gas to ambient air. |
| What is the purpose of pressurizing the aircraft cabin? | To make human flight possible in the hostile environment of the upper atmosphere. |
| The purpose of a subcooler in a vapor-cycle cooling system is to | cool the freon to prevent premature vaporization. |
| On some cabin pressurization systems, pressurization on the ground is restricted by the | main landing gear operated switch. |
| What is the condition of the refrigerant as it leaves the evaporator of a vapor-cycle cooling system? | Low-pressure vapor. |
| How is the cabin pressure of an aircraft maintained in flight? | By controlling the rate of the air flowing out of the cabin. |
| What is the condition of the refrigerant as it enters the evaporator of a vapor-cycle cooling system? | Low-pressure liquid. |
| The cabin pressurization modes of operation are | differential, unpressurized, and isobaric. |
| What is the condition of the refrigerant as it leaves the condenser of a vapor-cycle cooling system? | High-pressure liquid. |
| When a vapor-cycle cooling system is not in operation, what is an indication that the system is leaking freon? | Oil seepage. |
| 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. |
| A small amount of water in a vapor cycle cooling system can freeze | in the expansion valve and stop the entire system operation. |
| Oxygen systems in unpressurized aircraft are generally of the | continuous-flow and pressure-demand types. |
| Oxygen used in aircraft systems | is at least 99.5 percent pure and is practically water free. |
| 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. |
| Which oxygen system employs a regulator that operates only when the user inhales? | Continuous-flow system. |
| 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. |
| For use in pressurized aircraft, which is generally the least complicated and requires the least maintenance? | Chemical oxygen generator systems. |
| If oxygen bottle pressure is allowed to drop below a specified minimum, it may cause | moisture to collect in the bottle. |
| Composite oxygen bottles that conform to DOT-E-8162 have a service life of | 15 years or 10,000 filling cycles whichever occurs first. |
| 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. |
| 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. |
| What is the condition of the refrigerant as it enters the condenser of a vapor-cycle cooling system? | High-pressure vapor. |
| What component of a pressurization system prevents the cabin altitude from becoming higher than airplane altitude? | Negative pressure relief valve. |
| What does a steady stream of bubbles indicate when servicing a vapor cycle air conditioning system? | The system is under charged. |
| The function of the evaporator in a freon cooling system is to | lower the temperature of the cabin air. |
| How often should standard weight high-pressure oxygen cylinders be hydrostatically tested? | Every 5 years. |
| 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. |
| In a gaseous oxygen system, which of the following are vented to blow out plugs in the fuselage skin? | Pressure relief valves. |
| 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. |
| The basic air-cycle cooling system consists of | a source of compressed air, heat exchangers, and a turbine. |
| 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. |
| 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. |
| 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. |
| If the cabin rate of climb is too great, the control should be adjusted to cause the | outflow valve to close faster. |
| Turbine engine air used for air conditioning and pressurization is generally called | bleed air. |
| The primary function of the cabin pressurization system outflow valve is to | maintain the desired cabin pressure. |
| 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. |
| Which best describes cabin differential pressure? | Difference between the ambient and internal air pressure. |
| What may be used as a lubricant on oxygen system tapered pipe thread connections? | Teflon tape. |
| 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. |
| 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. |
| Frost or ice buildup on a vapor-cycle cooling system evaporator would most likely be caused by | inadequate airflow through the evaporator. |
| What unit in a vapor-cycle cooling system serves as a reservoir for the refrigerant? | Receiver-dryer. |
| Hot compressor bleed air operates the conditioned air system on some turbine aircraft, cold air supplied by the | air cycle air conditioning. |
| 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. |
| 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. |
| 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. |
| 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. |
| 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. |
| 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. |
| At which component in an air-cycle cooling system does air undergo a pressure and temperature drop? | Expansion turbine. |
| What is the main cause of contamination in a gaseous oxygen system? | Moisture. |
| 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 |
| What controls the amount of oxygen delivered to a mask in a continuous-flow oxygen system? | Calibrated orifice. |
| What is used in some oxygen systems to change high cylinder pressure to low system pressure? | Pressure reducer valve. |
| The purpose of the dump valve in a pressurized aircraft is to relieve | all positive pressure from the cabin. |
| How should you determine the amount of oxygen in a portable, high-pressure cylinder? | Read the pressure gauge mounted on the cylinder. |
Created by:
Jack Mollohan