Brainscape's Knowledge GenomeTM

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


See full index

KV Prep > Air conditioning and pressurization > Flashcards

Air conditioning and pressurization Flashcards

1
Q

Which engine normally provides bleed air to which pack

A

The left engine - left pack

right engine - right pack

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

How is the bleed air from both engines kept separate?

A

The isolation valve

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

Can the left engine provide bleed air to the right pack? If so, how?

A

Yes. By selecting the ISOL switch to OPEN, the BLEED SOURCE rotary selector to L ENG, and then placing the BLEED VALVES rotary selector in MANUAL

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

How is the ISOL switch normally positioned?

A

CLSD

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

What does the cabin pressure controller do?

A

It independently acquires and monitors cabin pressure, outside air pressure, differential pressure and rate of change information and commands the outflow valves to move based on this information

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

How many automatic cabin pressure controllers are there and why?

A

2

One is active and the other is in standby ready to assume control if the active controller fails

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

What does the CPAM (Cabin Pressure Acquisition Module) do?

A

First, it acquires cabin pressure and rate of change information for display on the EICAS.

In the event both CPCs fail, this information will let the crew know how they should manually operate the outflow valve.

Second, it commands the passenger oxygen masks to deploy and the seatbelt no smoking signs to illuminate if the cabin altitude exceeds 14,000 feet

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

Describe how to manually control cabin pressure

A

Push the PRESS CONTROL switch light and adjust the MAN RATE knob to full decrease.

Then move the MAN ALT switch either up or down depending on if you want the cabin to climb or descend.

To increase the rate of change, slowly move the MAN RATE knob towards the increase position.

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

How many outflow valves are there

A

1

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

How is the outflow valve powered?

A

Electrically (Not pneumatically) by 3 separate electric motors

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

What commands the 3 outflow valve motors?

A

Motor 1 - CPC 1
Motor 2 - CPC 2
Motor 3 - Manually controlled by the pilot with the MAN RATE & MAN ALT knobs

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

During automatic mode when the CPCs are in control, how many operational phases are there?

A

7

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

Name the CPC’s operational phases

A 
Ground phase
Takeoff phase
Flight abort phase
Climb/cruise phase
Descent phase
Landing phase
touch and go phase
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What does the flight abort phase do?

A

It will assume the departure field elevation will be the landing field elevation until the airplane climbs through 6000 feet or 10 minutes passes

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

What is the EMER DEPRESS button used for?

A

In an emergency the crew can push it to depressurize the airplane. Its use is prohibited above 15000 feet

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

When will the cabin altitude aural warning sound?

A

At a differential pressure of 8.7

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

Will the cabin fully decompress while flying at 41,000 Feet?

A

No. The cabin will depressurize up to a cabin altitude of 14,500 feet plus or minus 500

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

What does the ground valve do?

A

It ensures the cabin is depressurized on the ground, and increases air flow for avionics cooling

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

When does the ground valve open and close?

A

The ground valve closes when the main cabin door is closed prior to departure, and opens after landing with weight of wheels

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

What does the OVBD COOL FAIL status message indicate?

A

The ground valve failed to open after landing

21
Q

What does the “PACK” acronym stand for?

A

Pneumatic Air Conditioning Kit

22
Q

Which Pack provides cooling to the cockpit? Which to the cabin?

A

Left - cockpit

Right - cabin

23
Q

Can the left pack provide cooling to the cabin if the right pack fails?

A

Yes

24
Q

How can the left pack provide cooling to the cabin if the right pack fails?

A

Both packs provide air to the mixing manifold under the aft cargo.

Internal baffling in the mixing chamber will allow either pack’s air to both the cockpit and cabin.

25
Q

How is the cabin temperature manually adjusted?

A

Push the MAN CABIN button to take manual control of the temperature control valve, then move the HOT COLD switch in the desired direction for the cabin temperature

26
Q

Can the aircraft be flown with 1 pack inoperative ?

A

Yes, but the flight is limited to 31,000 Feet

27
Q

What is the maximum cabin differential pressure?

A

+8.7 psi
-.5 psi
.1 psi during taxi

28
Q

What protects the airplane from overpressure or negative pressure situations?

A

2 safety valves, 1 for overpressure, and 1 for negative pressure

29
Q

From what engine stages can bleed air be extracted from?

A

The 6th stage under normal operations and 10th stage HPV (High pressure valve) for high demand situations (Anti-ice on, or low power settings)

30
Q

Can air be taken from the 6th and 10th stage simultaneously?

A

No. There is a one way check valve

31
Q

When does bleed air switch from the APU to the engines after takeoff?

A

After takeoff when the trust levers are pulled out of the TOGA detent with the gear up and flaps at 20* or less

32
Q

When does the the bleed air switch from the engines to the APU on approach?

A

With gear or flaps extended to 20* or greater, with thrust out of TOGA

33
Q

Describe the function of the Load Control Valve

A

The LCV regulates the flow of air from the APU

34
Q

What is the APU’s priority, pneumatically or electric?

A

The APU’s primary purpose is to provide electrical power

35
Q

What manages bleed air distribution, and the air conditioning system?

A

2 air conditioning system controllers (ACSC 1 & 2)

36
Q

Is the external ground air connector displayed on the ECS page?

A

No. However, a digital air pressure readout will indicate external air is being provided

37
Q

What emergency situation requires the RAM AIR switch light to be pressed?

A

When emergency ventilation of the cabin is required

38
Q

Where does ram air come from?

A

A scoop at the base of the vertical stabilizer

39
Q

What is the water extracted from the pack used for?

A

It is sprayed across the pack heat exchangers in the ram air duct

40
Q

When does the CABIN PRESSURE aural warning sound?

A

If cabin alt. exceeds 10,000 feet or the pressure differential exceeds 8.7 psi

41
Q

Which hydraulic system are cooled by ram air?

A

System 1 and 2

42
Q

How many recirculation fans are there?

A

1 switch, but 2 fans

43
Q

How are the cockpit avionics and splays cooled?

A

They are cooled by dedicated cooling fans

44
Q

If both display fan fail, how are the displays kept cool?

A

STDBY should be selected on the DISPLAY FAN rotary selector, which allows conditioned cockpit air to cool them

45
Q

What does the amber CABIN ALT caution message indicate?

A

Cabin altitude is between 8,500 - 10,000 feet

46
Q

Generally describe the journey of air from outside the airplane, through the airplane and back outside

A

Air first enters the engine.

Then it is ducted to the packs as hot bleed air

From the packs it enters the cabin as conditioned air

From the cabin it would exit outside through the outflow valves

47
Q

What is the function of the pressure regulating shutoff valves (PRSOVs)

A

The PRSOVs modulate as commanded by the air conditioning system controllers (ACSC) to maintain approximately 45 psi plus or minus 3 in the bleed air manifolds

48
Q

Briefly describe the fundamentals behind an Air Cycle Machine (ACM)

A

An air cycle machine cycles hot air into cold air.

This is accomplished through compression and expansion.

Air is compressed inside the ACM causing its temperature to raise.

The air is then cooled via liquid cooled heat exchangers and allowed to rapidly expand out of the ACM. As the air rapidly expands, its temperature drops dramatically competing the cycle

49
Q

Describe the flow of air through the PACK components (Please Hand Charlie His Red Coat With Tails)

A 
Pre-cooler
Heat exchanger (primary)
Compressor
Heat exchanger (secondary
Re-heater
Condenser
Water Extractor
Turbine (Expansion Turbine)

KV Prep (14 decks)

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