Aircraft pressurization systems
After cleaning or replacing the filtering element in a combustion heater fuel system, the system should be pressurized and A- all connections checked for leaks B- the fuel filter bypass valve reset to the filter position C- a sample of fuel taken downstream from the filter to ensure proper operation of the new filtering element
A
An aircraft pressurization cycle is normally considered to be A- one complete series of events or operations that recur regularly B- one take off and one landing C- when the fuselage reaches its maximum pressure differential one time
A
For the use in pressurized aircraft, which is generally the least complicated and requires the least maintenance? A- chemical oxygen generator systems B- high pressure oxygen systems C- low pressure oxygen systems
A
The cabin pressure control setting has a direct influence upon the A- outflow valve opening B- pneumatic system pressure C- inflow valve opening
A
The purpose of the dump valve in a pressurized aircraft I to relieve A- all positive pressure from the cabin B- a negative pressure differential C- pressure in excess of the maximum differential
A
What controls the operation of the cabin pressure regulator? A- cabin altitude B- bleed air pressure C- compression air pressure
A
A pressurization controller uses A- bleed air pressure, outside air temperature and cabin rate of climb B- barometric pressure, cabin altitude and cabin rate of change C- cabin rate of climb, bleed air volume and cabin pressure
B
How is the cabin pressure of a pressurized aircraft usually controlled? A- by a pressure sensitive switch that causes the pressurization pump to turn on or off as required B- by an automatic outflow valve that dumps all the pressure in excess of the amount for which it is set C- by a pressure sensitive valve that controls the output pressure of the pressurization pump
B
If the cabin rate of climb is too great, the control should be adjusted to cause the A- outflow valve to close slower B- outflow valve to close faster C- cabin compressor speed to decrease
B
The cabin pressurization modes of operation are A- isobaric, differential, and maximum differential B- differential, unpressurized and isobaric C- ambient, unpressurized and isobaric
B
The primary function of the cabin pressurization system outflow valve is to A- provide protection against over pressurization B- maintain the desired cabin pressure C- maintain the same cabin air pressure at all altitudes
B
The purpose of a jet pump in a pressurization and air conditioning system is to A- produce a high pressure for operation of the outflow valve B- provide for augmentation of airflow in some areas of the aircraft C- assist in the circulation of freon
B
What component of a pressurization system prevents the cabin altitude from becoming higher than airplane altitude A- cabin rate of descent control B- negative pressure relief valve C- positive pressure relief valve
B
Which best describes cabin differential pressure? A- difference between cabin flight altitude pressure and mean sea level pressure B- difference between the ambient and internal air pressure C- difference between cabin pressure controller setting and actual cabin pressure
B
(1) Usually bleed air from a gas turbine engine compressor can be safely used for cabin pressurization (2) independent cabin condition air machines (air cycle machine) can be powered by bleed air from an aircraft turbine engine compressor. Regarding the above statements... A- only 1 is true B- only 2 is true C- both number 1 and 2 are true
C
The altitude controller maintains cabin altitude by modulation of A- safety and outflow valves B- safety valve C- outflow valve
C
The cabin pressure of an aircraft in flight is maintained at the selected altitude by A- controlling the air inflow rate B- inflating doors seals and recirculating conditioned cabin air C- controlling the rate at which air leaves the cabin
C
Which prevents a sudden loss of pressurization in the event that there is a loss of the pressurization source? A- firewall shutoff valve B- cabin pressure outflow valve C- delivery air duct check valve
C
