Brainscape's Knowledge GenomeTM

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


See full index

Mod 11: Systems > 11.4 Contd - Pressurisation > Flashcards

11.4 Contd - Pressurisation Flashcards

1
Q

How is an aircraft pressurised?

A

Constant flow of air from the air the aircraft packs and the pressure is controlled by modulating the outflow valve.

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

What is a negative pressure relief valve?

A

Prevents higher pressure building up outside fuselage than the inside pressure.

Negative Pressure relief valve / vacuum relief valve allows pressure outside aircraft into the cabin.

This negative pressure differential mostly occurs during descents

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

What is cabin differential pressure?

A

Cabin differential pressure is the ratio between inside and outside air pressures and is a measure of the internal stress on the fuselage skin.

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

Describe a cabin altitude profile for an aircraft taking off from sea level and landing at 500 ft?

A

Cabin vertical speed - 500 ft/min climb rate

Cruise - max cabin altitude 8,000 ft

Cabin vertical speed - 300 ft/min descent rate

Adjust barometer from take off to landing (sea level to 500ft for landing)

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

How is cabin pressure controlled?

A

Varying the amount of air allowed to leave the cabin through the controller operated outflow valve controls the cabin pressure

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

How are the outflow valves operated?

A

AC-motor is used for automatic mode and controlled from the cabin pressure controller.

DC motor is used for manual mode and controlled by switch in the cockpit

AC- automatic control

DC - manual control

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

What is normally the position of the outflow valve after landing

A

Fully Open

(Just before landing will be fully open so airframe doesn’t have to take landing load and pressure load at same time)

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

What 3 indicators will the flight crew have for pressurisation system?

A

Cabin altitude indicator

Cabin VSI (Vertical Speed indicator)

Differential Pressure indicator

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

Which one of the pressure indication displays senses outside ambient pressure?

A

Cabin Differential Pressure Indicator

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

What warnings are there for the cabin pressurisation system (and at what altitudes)?

A

Press Relief warning light (is on as long as a pressure relief valve is open)

Rate Limit warning light ( Comes on if excessive vertical speed rate is detected >500 PSI ascent or >300 PSI descent)

A cabin altitude warning switch senses cabin pressure and initiates an intermittent warning sound in the cockpit if the cabin altitude exceeds 10’000 ft. The warning sound can be stopped by pressing the horn cutout P/B on the indication panel.

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

b) the structural strength of the aircraft cabin

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

b) cabin is not pressurised

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

b) the outflow valve must be closed

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

a) to regulate the cabin pressure

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

What are the 3 primary functions of a cabin pressurisation system?

A
  1. Maintain a cabin pressure altitude of 8,000 ft at the maximum designed cruising altitude
  2. Prevent rapid changes to cabin altitude, max climb rate 500 ft/min , max descent rate 300 ft/min
  3. Pressurisation system should permit a reasonably fast exchange of air from inside to outside the cabin to eliminate odours and to remove stale air.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

The amount of air pumped into the cabin is in excess of that needed.

Varying the amount of air allowed to leave the cabin through the controller operated ____ ____ controls the cabin pressure

A

Outflow valve

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

The pressurisation system provides the pressure differential between the ____ and ____

A

Cabin and ambient

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

What should the Cabin/Ambient differential pressure be approximately

A

8 PSI

(7.29 PSI exact)

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

Pressure control systems consist of:

1.

2.

3.

4.

5.

A
  1. Outflow valves
  2. Pressure controller
  3. control panel
  4. Pressure Relief valves
  5. Negative Relief valves
  6. Monitoring indicators
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

A ____ ____ ____ is used to start pressurisation after lift-off and fully open the valves after landing.

A

Ground relay input

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

Pressurised air comes from the same air as the ___ ____ ____

A

Air conditioning system (Pack)

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

Cabin pressure is controlled by _______ ____

A

Outflow Valve(s)

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

The cabin Outflow valve(s) is ______

It is never fully open or fully closed, it is always somewhere in between

A

modulating

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

The Outflow valve(s) is controlled by two motors, explain:

A

AC motor which is controlled by the Cabin Pressure Controller (CPC) and is automatic (Auto mode)

DC motor which is controlled by a switch in the cockpit (manual mode)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

Name the 3 pressurisation indicators/gauges that are in the cockpit?

A
  • Cabin Altitutude (Max 8,000 ft)
  • Vertical Cabin speed indicator (ascent 500 ft/min max, descent 300 ft/min max)
  • Differential Pressure Indicator
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

Pressing the aircraft ‘Ditching’ P/B will cause ….

A

All valves to close

27
Q

When is the purpose of a Positive Pressure Relief Valve?

A

Opens when cabin pressure is higher in comparison to ambient pressure

28
Q

What is the purpose of a Negative Pressure Relief Valve?

A

Allows pressure outside aircraft into cabin

i.e Opens when ambient pressure is greater than cabin pressure (usually occurs if descent is too great)

29
Q

What does a Safety Relief valve consist of?

A

Positive and Negative Pressure Relief valves

30
Q

What is cabin altitude?

A

Cabin altitude is the height (in ft) that the cabin would be at in terms of pressure

31
Q

What is the result of closing the Outflow valve?

A

Closing the outflow valve reduces air leaving the cabin causing the pressure to increase and cabin altitude to decrease

32
Q

What is the result of opening the outflow valve?

A

Opening the outflow valve will decrease the cabin pressure causing the cabin altitude to climb

33
Q

What is the purpose of blow out panels?

A

Blow out panels are fitted in the floor between passenger and cargo compartments in order to prevent excessive differences in pressure occurring between these areas.

34
Q

What is the maximum cabin altitude allowed?

A

8,000 ft

35
Q

What is the Maximum differential pressure allowed?

A

7.29 PSI

(8 - 9 psi)

36
Q

Positive Pressure Relief valves prevent excessive ____ _____ ____

A

Positive Differential Pressure

37
Q

Negative Pressure Relief Valve prevents _____ ____ ___

A

Negative Differential Pressure

38
Q

What is the purpose of the Dump Valve?

A

The Dump Valve is used to completely depressurise the aircraft

39
Q

What does the Ditching control P/B do?

A

The Ditching control PushButton closes all outflow valves prior to landing on water

40
Q

Where are Blow Out panels fitted?

A

Blow Out panels are fitted in the floor between the passenger and cargo compartments

41
Q

There will be an aural or visual warning when the cabin altitude …

A

Exceeds 10,000 ft

42
Q

In a turbine-engine powered aircraft the air for pressurisation comes from the _______ section of the engine

A

compressor

43
Q

The air used for pressurising a turbine-engine powered aircraft is called __________ air

A

compressor bleed

44
Q

The cabin altitude is the same as the flight altitude when the aircraft is operating in the ________ mode

A

unpressurised

45
Q

The maximum differential pressure allowed in a pressurised aircraft is determined by the strength of the __________

A

aircraft structure

46
Q

If the cabin rate of climb is too great, the rate control will cause the outflow valve to close _______

(Faster or Slower)

A

Faster

47
Q

A negative-pressure relief valve is incorporated in a pressurisation system to prevent cabin pressure ever becoming _________ than the surrounding air pressure

(lower or higher)

A

lower

48
Q

Heat for the cabin of a jet transport airplane is provided by __________ air

A

compressor bleed

49
Q

In a jet transport airplane, hot compressor bleed air is mixed with cold air from the ________ machine to get air of the correct temperature for the cabin

A

Air Cycle

50
Q

Moisture that condenses from the pressurising air after it leaves the turbine is removed by the ___________

A

water separator

51
Q

Water is prevented from freezing in the water separator by routing some ________ around the air-cycle machine to mix with cold air and raise its temperature

A

warm air

52
Q

In a vapor-cycle cooling system, heat from the cabin is absorbed into the refrigerant in the _________

A

evaporator

53
Q

Heat taken from the cabin is transferred into the outside air by the _______

A

condenser

54
Q

The refrigerant enters the evaporator as a _______ (high or low) pressure ______ (liquid or vapor)

A

low pressure liquid

55
Q

The refrigerant leaves the evaporator as a ________ (high or low) pressure _______ (liquid or vapor)

A

low pressure vapor

56
Q

The refrigerant enters the condenser as a _____ (high or low) pressure _______ (liquid or vapor)

A

high pressure vapor

57
Q

The refrigerant leaves the condenser as a _______ (high or low) pressure ______ (vapor or liquid)

A

high pressure liquid

58
Q

The receiver-dryer holds the refrigerant in its ______ (liquid or vapor) state

A

liquid

59
Q

The two units that divide a vapor cycle system into a high side and a low side are the ______________ and the ________

A

thermostatic expansion valve

compressor

60
Q

The component in an air conditioning system that increases both the temperature and the pressure of the gaseous refrigerant is the _______

A

compressor

61
Q

The condenser is in the ______ (high or low) side of an air conditioning system

A

high

62
Q

The air conditioning system component that meters liquid refrigerant into the evaporator coils is the _________________

A

thermostatic expansion valve

63
Q

The evaporator is in the _______ (high or low) side of an air conditioning system

A

low

Mod 11: Systems (37 decks)

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