Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

M11 Questions > 11.4 > Flashcards

11.4 Flashcards

1
Q

Main source of air conditioning in flight

A

From the engine via the pneumatic system

Example sentence: The main source of air conditioning in flight is from the engine via the pneumatic system.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Condition of arriving at the air conditioning packs

A

Approximately 200 degrees at 45 psi

Example sentence: The air arriving at the air conditioning packs is normally at approximately 200 degrees at 45 psi.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Treatment of ozone in the air supplied to the air conditioning system

A

The ozone converter incorporates a catalyst that converts the ozone to harmless oxygen.

Example sentence: The ozone in the air supplied to the air conditioning system is treated by the ozone converter, which converts it to harmless oxygen.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Purpose of the bleed valve

A

To regulate the engine bleed air supply.

Example sentence: The purpose of the bleed valve is to regulate the engine bleed air supply.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Purpose of the check valve of the engine compressor

A

To protect the engine compressor from the air-backflow.

Example sentence: The purpose of the check valve of the engine compressor is to protect it from air-backflow.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Valve that acts on the air supplied from an APU

A

APU bleed valve

Example sentence: The valve that acts on the air supplied from an APU is the APU bleed valve.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Ideal condition of air for the pneumatic system

A

Air at new constant pressure and temperature.

Example sentence: The ideal condition of air for the pneumatic system is air at a constant pressure and temperature.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Regulation of quantity of air entering the cabin

A

By the pack valve.

Example sentence: The quantity of air entering the cabin is regulated by the pack valve.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Principle used by the vapour cycle machine for cooling effect

A

The refrigerant is cooled by the process of expansion and absorbs the heat energy in the air, which is passed to the cabin.

Example sentence: The vapour cycle machine achieves the cooling effect by cooling the refrigerant through expansion and absorbing heat energy in the air.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Part of the vapour cycle machine where heat is discharged to the atmosphere

A

In the condenser.

Example sentence: The heat is discharged to the atmosphere in the condenser of the vapour cycle machine.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Correct sequence of path of refrigerant in a vapour cycle machine

A

Compressor, condenser, expansion valve, evaporator.

Example sentence: The correct sequence of the path of refrigerant in a vapour cycle machine is compressor, condenser, expansion valve, evaporator.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Location of heat exchangers in the cooling pack

A

Primary is before the compressor. Secondary is between the compressor and the turbine.

Example sentence: The heat exchangers in the cooling pack are usually located with the primary before the compressor and the secondary between the compressor and the turbine.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

How is the cooling of the air achieved in an air cycle machine?

A

By the heat exchangers and turbine.

Example sentence: The cooling of the air in an air cycle machine is achieved by the heat exchangers and turbine.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Consider the very low temperature of the air leaving the air cycle machine. How is it possible to prevent water from freezing in the system?

A

Warm air is passed around the cooling pack and is used to warm the air after the turbine.

Additional information: Warm air is used to prevent water from freezing in the system.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

The aircraft is on the ground with no ram air passing over the heat exchangers in the air conditioning system. How is cooling achieved?

A

There is a fan driven by the shaft of the air cycle machine.

Example sentence: Cooling is achieved in this scenario by a fan driven by the shaft of the air cycle machine.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

How does the ozone converter work?

A

By catalytic action.

Example sentence: The ozone converter works through catalytic action.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What happens if the air supply to the pack valve fails?

A

The valve closes under spring pressure.

Example sentence: If the air supply to the pack valve fails, the valve closes under spring pressure.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What is the effect if the air cycle machine bypass valve opens?

A

The turbine slows down and air ambient temperature rises.

Example sentence: When the air cycle machine bypass valve opens, the turbine slows down and air ambient temperature rises.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

How does a coalescer type water separator work?

A

By encouraging the water to form large droplets that can be centrifuged out of the air.

Example sentence: A coalescer type water separator works by encouraging water to form large droplets that can be centrifuged out of the air.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

How is the pressure in the aircrafts cabin regulated?

A

By the outflow valves regulating the amount of air leaving the cabin.

Example sentence: The pressure in the aircraft’s cabin is regulated by the outflow valves controlling the amount of air leaving the cabin.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Which is true for an aircraft on the ground and the pressurisation system is on ground mode?

A

The outflow valves are commanded to the fully open position.

Example sentence: In this scenario, the outflow valves are commanded to the fully open position.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Which is true regarding cabin pressure controllers?

A

There are two controllers one is active one is standby all the time.

Example sentence: Regarding cabin pressure controllers, there are always two controllers - one active and one standby.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

What is the purpose of pre-pressurisation before take off?

A

To stabilise the fuselage and prevent pressure fluctuations as the aircraft rotates.

Example sentence: Pre-pressurisation before take off is done to stabilize the fuselage and prevent pressure fluctuations during aircraft rotation.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

What happens in the pressurisation system at aircraft touchdown?

A

The cabin pressure controllers swap roles and the outflow valves are driven fully open.

Example sentence: At aircraft touchdown, the cabin pressure controllers swap roles and the outflow valves are fully open.

25
Q

What is the purpose of positive pressure relief valves?

A

To protect the structure from damage from excessive positive differential pressure.

Example sentence: Positive pressure relief valves are important for maintaining the structural integrity of the aircraft.

26
Q

Which climb mode of pressurisation is usually more comfortable for the passengers?

A

External

No additional information

27
Q

What happens in the event of excessive cabin positive pressure?

A

Safety valves open to allow pressure to bleed away.

No additional information

28
Q

What happens to the pressure system is the cabin altitude reaches 15,000ft?

A

The outflow valves are completely closed independent of the normal control system.

No additional information

29
Q

Which devices are installed to prevent damage of the structure in the event of a sudden decompression of one part of the aircraft?

A

Equalisation valves allow the pressure in various zones to equalise.

No additional information

30
Q

From what do the cabin pressurisation safety devices protect the fuselage structure?

A

High positive delta P, and negative delta P.

No additional information

31
Q

What pressure is the cabin raised to during pressurisation leak tests?

A

Approximately 4 psi higher than the ambient pressure.

No additional information

32
Q

Which circuit defends the air conditioning system from duct overheat in the event of of component failure or mis control in manual mode?

A

The protection circuits of the zone temperature control system.

No additional information

33
Q

Which supply sources are used to supply the air conditioning system?

A

APU, Engines, and Ground pneumatic air supply.

No additional information

34
Q

What are the requirements that an air conditioning system must be able to provide?

A

Temperature control, Ventilation, and pressurisation of cabin and cargo compartments, and equipment ventilation.

No additional information

35
Q

The air conditioning packs.

A

Cool the air coming from the pneumatic system.

No additional information

36
Q

The air conditioning system consists of?

A

Heat exchanger, air cycle machine, or vapour cycle machines.

No additional information

37
Q

How does a vapour cycle machine cool the pneumatic flow?

A

A special cooling fluid is compressed and expanded in a closed circuit.

No additional information

38
Q

What components does an air cycle machine comprise?

A

A compressor, a turbine, and a heat exchanger

Example sentence: The air cycle machine comprises a compressor, a turbine, and a heat exchanger.

39
Q

How is air cooled during the cooling cycle?

A

Air is pre cooled by the heat exchanger, compressed by the compressor, cooled by the heat exchanger and expanded by the turbine.

No additional information.

40
Q

Why is there a requirement for ventilation of the temperature sensors in the cabin zones?

A

The ventilation delivers the cabin air to the sensors.

No additional information.

41
Q

Why is the mixing unit required within the air conditioning system?

A

It mixes the cold air from the packs with the recirculated air from the passenger cabin.

No additional information.

42
Q

What altitude is the cabin pressure allowed to circulate to?

A

8000ft

No additional information.

43
Q

During a cabin pressure leakage check test, why must all instructions be adhered to?

A

Injury to personnel inside the cabin could occur, as well as damage to pressure sensitive components.

No additional information.

44
Q

In an ideal situation what is the best condition for the aircraft structure with regards to pressurization?

A

The best condition for the aircraft structure would be no pressurization during flight.

No additional information.

45
Q

What will happen to cabin pressure if the outflow valve is driven towards open?

A

The cabin pressure decreases.

No additional information.

46
Q

What is the purpose of the ditching button on the cabin pressurization control panel?

A

To isolate the cabin from water entering during an emergency landing in the sea.

No additional information.

47
Q

What is the main purpose of the pressurization outflow valves?

A

To regulate pressure in the cabin.

No additional information.

48
Q

Why would an outflow valve have 2 AC motors and one DC motor?

A

Each pressure controller can control its own AC motor and if AC is not available the DC motor can control the valve.

No additional information.

49
Q

What function does the safety valve perform?

A

Provides both over pressure and negative pressure relief.

Example sentence: The safety valve ensures the cabin pressure remains within safe limits.

50
Q

What will happen if cabin altitude reaches 15,000ft?

A

Outflow valve automatically closes.

No additional information.

51
Q

What will happen if cabin altitude reaches 14,000ft?

A

Automatically release passenger masks.

No additional information.

52
Q

What will happen if cabin altitude reaches 10,000ft?

A

Flight crew warning to put masks on.

No additional information.

53
Q

What two conditions can cause an equipment cooling system to override operation to happen?

A

Component failure or smoke detected.

No additional information.

54
Q

How many personnel are required in the cockpit and cabin to monitor ground check of pressurisation control?

A

2 if using normal pressure sources for example the APU.

No additional information.

55
Q

What mode would the cabin pressurisation be in if the outflow valves de motor was used?

A

Manual.

No additional information.

56
Q

On the outflow valve when AC motor 2 is operating what happens to motor 1?

A

Disabled by a brake.

No additional information.

57
Q

During cabin pressure tests why is it possible for electrical equipment to overheat?

A

Skin outlets close.

No additional information.

58
Q

What pressurisation mode would be used for cabin leak tests on the ground?

A

Manual.

No additional information.

59
Q

What is the role of the pneumatic controller?

A

Monitor pressure and temperature, to register leaks and to monitor the operation of the pneumatic components.

No additional information.

M11 Questions (21 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions