Oxygen
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 pressurizing the aircraft cabin?
To make human flight possible in the hostile environment of the upper atmosphere.
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.
What is ventilating air used for on a combustion heater?
Carries heat to the places where needed.
When a vapor-cycle cooling system is not in operation, what is an indication that the system is leaking freon?
Oil seepage.
Composite oxygen bottles that conform to DOT-E-8162 have a service life of
15 years or 10,000 filling cycles whichever occurs first.
For use in pressurized aircraft, which is generally the least complicated and requires the least maintenance?
Chemical oxygen generator systems.
The basic air-cycle cooling system consists of
a source of compressed air, heat exchangers, and a turbine.
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.
What is the condition of the refrigerant as it leaves the evaporator of a vapor-cycle cooling system?
Low-pressure vapor.
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.
Hot compressor bleed air operates the conditioned air system on some turbine aircraft, cold air supplied by the
air cycle air conditioning.
After cleaning or replacing the filtering element in a combustion heater fuel system, the system should be pressurized and
all connections checked for leaks.
What is the condition of the refrigerant as it enters the condenser of a vapor-cycle cooling system?
High-pressure vapor.
In a high-pressure oxygen system, if the pressure reducer fails, what prevents high-pressure oxygen from entering the system downstream?
Pressure relief valve.
On some cabin pressurization systems, pressurization on the ground is restricted by the
main landing gear operated switch.
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.
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.
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
What must be done before any maintenance can be done on an oxygen system?
The oxygen supply must be turned off at the bottle valve.
What component of a pressurization system prevents the cabin altitude from becoming higher than airplane altitude?
Negative pressure relief valve.
Where does the last stage of cooling in an air-cycle air conditioning system occur?
Expansion turbine.
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.
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.