FAA O&P- G.K.

Is there any special requirement as to the type of oxygen used in an aircraft system, and if so, what is it

Only aviator’s oxygen should be used

Describe the operating principle of a continuous flow oxygen system

High-pressure oxygen flows from the storage cylinder to a pressure regulator where its pressure is reduced and then to the mask outlets whenever the system is turned on

What should be used to purge an oxygen system of moisture

Oxygen, dry air, or dry nitrogen

What action must be taken when an oxygen system has been open to the atmosphere

the system must be purged of any moisture

Describe the safety precautions that should be observed when servicing oxygen systems

Avoid all contact with petroleum based oil or grease, don't smoke, keep everything clean, service systems outdoors if at all possible, and keep the caps on the bottles to protect the valves

What is a roots blower

A type of engine driven compressor

Name two different types of independent cabin air compressors

positive displacement and centrifugal

What is the source of pressurization air in most jet aircraft

Engine bleed Air

What device provides the principle means of controlling cabin pressure

The outflow valve

What unit regulates the position of an outflow valve

the cabin pressure controller

Name several methods used on recip engine aircraft for providing heated cabin air

Exhaust shroud heat exchangers, combustion heaters, and electric heaters

What is the function of the ventilating air in the combustion heate

ventilating air transports the heat from the heater into the cabin and prevents combustion gases from entering the cabin if the combustion chamber develops a crack

What are the sources of ventilating air in a combustion heater

Ram air in flight, a blower on the ground, or possibly a compressor if the airplane is pressurized

Name the basic components of an air cycle cooling system

the compressor and expansion turbine, heat exchangers, and various valves

Describe the basic operating principles that allow an air cycle system to produce cool air

hot engine bleed air is cooler in the primary heat exchanger, compressed, then cooled again in the secondary heat exchanger. The air is expanded across the turbine where energy is extracted and the pressure is reduced. This produces a large temperature drop

Describe the basic operating principles of a water separator

cool, moist air is swirled so that water droplets are separated by centrifugal force, captured by a sock, and drained

Name the principal components of a vapor cycle system

a compressor condenser expansion valve, and evaporator

In what significant way is a capor cycle cooling system different from an air cycle system

vapor cycle systems use a refrigerant liquid, usually freon

why is oil added to the refrigerant in a vapor cycle air conditioning system

to lubricate the compressor