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2AX5X Vol. 3

QuestionAnswer
How is oxygen separated from other gases in the air? By compressing and cooling the air.
Why must aviator's breathing oxygen be "bone dry"? To ensure operations of oxygen system components. Oxygen with a high moisture content would freeze at high altitudes causing the oxygen system to be inoperative.
List some of the warning signs of hypoxia. Blurred vision, slight shortness of breath, a vague weak feeling, light dizziness.
What is the maximum pressure at which low-pressure gaseous oxygen cylinders are charged? 450 Psi m.
What color are low-pressure gaseous oxygen cylinders painted? Yellow.
How are oxygen tubes color-coded? With the bands of green and white cellulose tape.
What two types of connections are used in a low-pressure oxygen system? Pipe-thread and flared tube connections.
What component reduces system pressure in a high-pressure gaseous oxygen system? A pressure reducer valve.
What construction methods prevent high-pressure gaseous oxygen cylinders from shattering? Heat treated alloy wrapped with steel wire.
What are the two main types of oxygen regulators? The continuous flow and pressure-demand type.
What's a disadvantage of the continuous-flow regulator as compared to other types? Wastes oxygen.
The MD-1 oxygen regulator can be used with what types of oxygen systems? With high or low-pressure gaseous or liquid oxygen systems.
In an emergency the pressure-demand regulator can supply oxygen to what altitude? 50,000 feet.
What should system pressure be during an operational check of a regulator? Near normal operating pressure.
Explain how the molecular sieve bed operates. Nitrogen in the air is absorbed in one bed of molecular sieve while oxygen passes through the bed. When the molecular sieve becomes saturated the concentrator vents nitrogen overboard.
What happens if the MSOGS concentrator fails? It will turn on an oxygen caution light in the cockpit and automatically switch to the backup oxygen supply.
What's the temperature of liquid oxygen? -297 degrees Fahrenheit.
Why should liquid oxygen never be sealed, capped, or tapped in a container without a relief-valve? It will rupture the container.
What factors are used to determine converter size? The number of crews, mission duration, and type of oxygen regulation equipment used.
What's the probable cause if frost appears on the outside of a LOX container? Vacuum loss.
How are pressure control valves controlled? Spring loaded bellows.
What's the primary purpose of the pressure-closing valve? To maintain a constant head pressure on top of the liquid oxygen in the storing container.
What's the normal position of the pressure-opening valve? Closed.
Why is it important to ensure there is no moisture in the fill, buildup, and vent valve? It may freeze in the vent position.
In what position should you manually place the buildup/vent valve during a filling operation? Vent position.
How are the check valve in quick disconnects operated? Automatically.
What are two modes of operation in the supply sequence of the liquid oxygen system? The economy mode and demand mode.
What technical manual covers the requirements for LOX systems inspection? -6 technical manual for the specified aircraft.
What is the purpose of a bleed air system? To operate or control pneumatic systems or components.
What are the three sources of bleed air used for system operations on jet aircraft? Aircraft engines; ground air cart; and gas turbine compressor, gas turbine units, or APUs.
What equipment provides bleed air when the aircraft is on the ground with the engine shutdown? A ground air cart.
List the components of a bleed air system. Check valves, shutoff valves, wing isolation or body crossover valves, flow control valves, pressure regulation valves, bleed air ducting and the necessary controls.
What is the purpose of a ground-air-connection check valve? Prevent the escape of bleed air from the system.
Define gouge. A defect wherein the surface of the material is cut or removed sufficiently to cause the duct wall thickness to be reduced.
Which bleed air duct system is subjected to the highest pressure/temperature? High pressure/high temperature.
What should you do anytime you locate a non-permissible leak in the high-pressure/high-temperature section of the bleed air system? Inspect the aircraft structure in the immediate area of the leak for heat damage.
What is air conditioning? The simultaneous control of temperature, humidity, and air distribution within a space.
Does heat always move to cold or cold always move to heat? Heat always moves to cold.
While the aircraft is in flight, what controls the flow of ram air to the primary heat exchanger(s)? Movable ram air inlet and/or exit doors that modulate in flight.
During low airspeeds or ground operation what induces cooling airflow to the primary heat exchangers when there is not enough ram air to cool the primary heat exchangers? Ejectors.
What consists of a centrifugal air compressor and an expansion turbine, and is often known as a "pack"? Air Cycle Machine.
Why would some of the outlet air from the primary heat exchanger need to bypass the air cycle machine? If cabin temperature controls call for warmer air.
What component provides an additional stage of cooling after the bleed air has left the primary heat exchanger and, if required, the air cycle machine? Secondary heat exchanger.
What is the primary purpose of the refrigeration bypass valve? To prevent water from freezing in the water separator.
What component uses centrifugal force to remove moisture in the air that is caused by rapid cooling? The water separator.
What two forms of energy are essentially interchangeable? Pressure and temperature.
What happens to heat of the engine bleed air as it passes through the primary heat exchanger(s)? Some of the heat is transferred to ram air.
Created by: Roy_White820
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