Test 3: Air Cycle Machine Review

Question 1

Where do we use an AIR CYCLE MACHINE and what does it provide?

Answer 1

Used in LARGE aircraft

Provides AC, pressurization

Question 2

Where do we get Hot air from?

Answer 2

Engine bleed air

Question 3

Where does the FLOW CONTROLLED engine bleed air go?

Answer 3

Primary heat exchanger

Question 4

This part of AC cycle reduces temperature before it goes into the COMPRESSOR

Answer 4

Primary Heat Exchanger

Question 5

In the compressor section what happens to the air?

Answer 5

Temperature and pressure RAISED

Question 6

How do we achieve comfortable cabin temp/press?

Answer 6

???

Question 7

After the compressor, what is the next step?

Answer 7

Secondary heat exchanger reduces the temp

Question 8

At the turbine section what happens?

Answer 8

Cools the air to 0C
lowers pressure
drives compressor

Question 9

At what section will moisture be condensed and how can we remove it?

Answer 9

The turbine section

removed by the WATER SEP. uses centrifugal effect

Question 10

What can we use to regulate the flow of BLEED AIR?

Answer 10

Flow Control Valve

Question 11

What is the average pressure of the PRIMARY heat exchanger?

Answer 11

30 - 40 psi T 150C

Question 12

This component is made up of Al alloy, plate, fin type and has a SINGLE PASS CROSS FLOW configuration?

Answer 12

PRIMARY heat exchanger

Question 13

Outside ram air is used for what?

Answer 13

Removes heat from the bleed air

Question 14

Collected water can be used for what?

Answer 14

sprayed onto the ram air duct

Question 15

This system is only used to cool and on non turbine aircraft?

Answer 15

VAPOR CYCLE

Question 16

Describe the basic VAPOR cycle?

Answer 16

vaporization of a refrigerant

Question 17

What are the types of Aircraft HEATERS?

Answer 17

Bleed Air
Electric Heating
Exhaust Shroud Systems
Combustion

Question 18

This heating system requires a large amount of GEN. output?

Answer 18

Electric Heating

Question 19

How does the Electric Heating System work?

Answer 19

a FAN blowing electric heating elements into the CABIN

Question 20

Exhaust shroud heaters are mostly used on what?

Answer 20

Single Engine Light Aircraft

Question 21

How does the exhaust shroud heaters work?

Answer 21

AMBIENT AIR directed to metal SHROUD/JACKET that encases part of the ENGINE MUFFLER/EXHAUST SYSTEM

Question 22

Exhaust Shroud System are prone to what?

Answer 22

CARBON MONOXIDE LEAKS should be inspected every 100hrs

Question 23

How do we inspect EXHAUST SHROUD systems?

Answer 23

soapy water and pressurize underwater

Question 24

How can we increase heat on EXHAUST shroud systems?

Answer 24

Welded studs

Question 25

What type of aircrafts do we use on small to medium type aircraft?

Answer 25

COMBUSTION HEATERS

Question 26

How does the COMBUSTION HEATER work?

Answer 26

AMBIENT AIR HEATED and sent to the cabin

Question 27

What is the purpose of a DUCT LIMIT SWITCH?

Answer 27

Keeps control fuel solenoid closed if there is not enough VENTILATION AIR

Question 28

What is the purpose of the PRESSURE SWITCH?

Answer 28

Prior to opening CONTROL FUEL SOLENOID

Question 29

Purpose of OVERHEAT SWITCH?

Answer 29

Controls of CONTROL FUEL SOLENOID

Question 30

This unit fires the spark plug

Answer 30

Ignition Unit

Question 31

What allows fuel to go to the unit?

Answer 31

MAIN SOLENOID VALVE

CABIN HEATER SWITCH

Question 32

What does the COMBUSTION HEATER THERMOSTAT do?

Answer 32

SECOND SOLENOID control