Test 3: Air Cycle Machine Review Flashcards
Where do we use an AIR CYCLE MACHINE and what does it provide?
Used in LARGE aircraft
Provides AC, pressurization
Where do we get Hot air from?
Engine bleed air
Where does the FLOW CONTROLLED engine bleed air go?
Primary heat exchanger
This part of AC cycle reduces temperature before it goes into the COMPRESSOR
Primary Heat Exchanger
In the compressor section what happens to the air?
Temperature and pressure RAISED
How do we achieve comfortable cabin temp/press?
???
After the compressor, what is the next step?
Secondary heat exchanger reduces the temp
At the turbine section what happens?
Cools the air to 0C
lowers pressure
drives compressor
At what section will moisture be condensed and how can we remove it?
The turbine section
removed by the WATER SEP. uses centrifugal effect
What can we use to regulate the flow of BLEED AIR?
Flow Control Valve
What is the average pressure of the PRIMARY heat exchanger?
30 - 40 psi T 150C
This component is made up of Al alloy, plate, fin type and has a SINGLE PASS CROSS FLOW configuration?
PRIMARY heat exchanger
Outside ram air is used for what?
Removes heat from the bleed air
Collected water can be used for what?
sprayed onto the ram air duct
This system is only used to cool and on non turbine aircraft?
VAPOR CYCLE
Describe the basic VAPOR cycle?
vaporization of a refrigerant
What are the types of Aircraft HEATERS?
Bleed Air
Electric Heating
Exhaust Shroud Systems
Combustion
This heating system requires a large amount of GEN. output?
Electric Heating
How does the Electric Heating System work?
a FAN blowing electric heating elements into the CABIN
Exhaust shroud heaters are mostly used on what?
Single Engine Light Aircraft
How does the exhaust shroud heaters work?
AMBIENT AIR directed to metal SHROUD/JACKET that encases part of the ENGINE MUFFLER/EXHAUST SYSTEM
Exhaust Shroud System are prone to what?
CARBON MONOXIDE LEAKS should be inspected every 100hrs
How do we inspect EXHAUST SHROUD systems?
soapy water and pressurize underwater
How can we increase heat on EXHAUST shroud systems?
Welded studs
What type of aircrafts do we use on small to medium type aircraft?
COMBUSTION HEATERS
How does the COMBUSTION HEATER work?
AMBIENT AIR HEATED and sent to the cabin
What is the purpose of a DUCT LIMIT SWITCH?
Keeps control fuel solenoid closed if there is not enough VENTILATION AIR
What is the purpose of the PRESSURE SWITCH?
Prior to opening CONTROL FUEL SOLENOID
Purpose of OVERHEAT SWITCH?
Controls of CONTROL FUEL SOLENOID
This unit fires the spark plug
Ignition Unit
What allows fuel to go to the unit?
MAIN SOLENOID VALVE
CABIN HEATER SWITCH
What does the COMBUSTION HEATER THERMOSTAT do?
SECOND SOLENOID control
