CABIN ATMOSPHERE AND RAIN CONTROL Flashcards
Which section of a turbine engine provides high pressure bleed air to an
air cycle machine for pressurization and air-conditioning?
Turbine compressor.
At which component in an air cycle cooling system does air undergo a
pressure and temperature drop?
Expansion turbine.
In a freon vapor cycle cooling system, where is cooling air obtained for the
condenser?
Ambient air
In a freon vapor cycle cooling system, where is cooling air obtained for the
condenser?
Ambient air
What controls the operation of the cabin pressure regulator?
Cabin altitude.
The basic air cycle cooling system consists of…
a source of compressed air, heat exchangers, and a turbine.
The purpose of the dump valve in a pressurized aircraft is to relieve________.
all positive pressure from the cabin.
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.
Frost or ice buildup on a vapor cycle cooling system evaporator would most
likely be caused by________.
inadequate airflow through the evaporator.
The altitude controller maintains cabin altitude by modulation of the____.
outflow valve.
Hot compressor bleed air operates the conditioned air system on some turbine
aircraft, how is cold air supplied?
By the air cycle machine turbine.
The main cause of contamination in gaseous oxygen systems is____.
moisture.
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.
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.
On some cabin pressurization systems, pressurization on the ground is restricted
by the____________.
main landing gear operated switch.
The function of the evaporator in a freon cooling system is to______ .
lower the temperature of the cabin air.
What component of a pressurization system prevents the cabin altitude from
becoming higher than airplane altitude?
Negative pressure relief valve
When checking a freon system, a steady stream of bubbles in the sight
gauge indicates the charge is________.
low.
The cabin pressurization modes of operation are______.
differential, unpressurized, and isobaric.
What is the condition of the refrigerant as it enters the condenser of a vapor
cycle cooling system?
high pressure vapor.
What is the condition of the refrigerant as it leaves the condenser of a vapor cycle
cooling system?
high pressure liquid.
What is the condition of the refrigerant as it leaves the condenser of a vapor cycle
cooling system?
high pressure liquid.
What is used in some oxygen systems to change high cylinder pressure to low
system pressure?
Pressure reducer valve.
In a high-pressure oxygen system, if the pressure reducer fails, what prevents high
pressure oxygen from entering the system downstream?
Pressure relief valve.
A contaminated oxygen system is normally purged with_______________.
oxygen.
