+
Related Flashcards
Related Topics
Cards In This Set
| Front | Back |
|
What is the principal control element in a cabin pressurization system?
|
Cabin outflow valve
|
|
What is the purpose of the negative pressure relief valve in the pressurization system?
|
Prevents an accidental cabin altitude which is higher than the altitude of the aircraft.
|
|
What control changes the position off the outflow valve?
|
The pressurization controller.
|
|
What are two groups of independent cabin compressors?
|
Positive displacement and Centrifugal.
|
|
What method is used by turbine powered aircraft for pressurization?
|
Bleed air.
|
|
What limits the degree of cabin pressurization?
|
Structural design and the capacity of the supercharger output.
|
|
What are three methods of supplying heat to the conditioned air when the "heat of compression" is not sufficient for this purpose?
|
Fuel burning combustion heaters, electric heaters, and exhaust gas air-to-air heat exchangers.
|
|
What is the function of ventilating air in a combustion heater?
|
Carries the heat to the places where it is needed.
|
|
What are the sources of ventilation air?
|
On the ground, a blower is used. In-fight, ram-air inlets or cabin compressors are used.
|
|
What are the components of an air cycle cooling system?
|
An expansion turbine, heat exchanger and various valves.
|
|
What causes a temperature drop in an air cycle cooling system?
|
The expansion turbine.
|
|
What are the components in a vapor cycle (Freon) cooling system?
|
The Compressor, Condenser, Receiver/Dryer, Expansion valve, and Evaporator.
|
|
How do you determine the liquid level in a vapor cycle cooling system?
|
Operate the system for 5 minutes, then observe the Freon flow through the sight glass. If bubbles appear, the Freon is low. A steady flow indicates a sufficient charge.
|
|
What are the components of a continuous flow oxygen system?
|
High pressure cylinder, high pressure lines, pressure regulating reducing valve, then a calibrated orifice controlling the oxygen flow to the mask.
|
|
What must be done if an oxygen system has been depleted and not recharged within two hours?
|
Purged with dry nitrogen or dry air and oxygen.
|
