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Part 121 - CRJ 701/900 > Pneumatics > Flashcards

Pneumatics Flashcards

1
Q

What is bleed air used for?

A
  1. Engine starting
  2. Engine Cowl anti-icing
  3. Wing anti-icing
  4. Air-conditioning
  5. Pressurization
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2
Q

What are all the possible sources of bleed air?

A
  1. Engines
  2. APU
  3. External High-pressure ground air source
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3
Q

What is the purpose of the ACSCs?

A

The Air Conditioning System Controllers regulate air pressure to ensure it is supplied at an adequate pressure to satisfy pneumatic system demands

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4
Q

What does the Bleed air leak detection system do?

A

Monitors pneumatic ducting for high temperature bleed air leaks

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5
Q

What will happen if the bleed air leak detection system detects a leak?

A

It will generate a MASTER WARNING “L/R BLEED DUCT” CAS message and give an aural warning that alerts the crew to shut down the bad bleed air system.

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6
Q

What is the purpose of the bleed isolation valve?

A

Separates the right and left pneumatic systems

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7
Q

What position is the Bleed air Isolation Valve in normally and why?

A

In the Closed position in order to allow the system to be pressurized by one or both of the engines

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8
Q

On the bleed air panel, what does moving the bleed valves knob to the manual position do?

A

It allows the bleed isolation valve to be positioned manually using the “ISOL OPEN/CLSD” switch.

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9
Q

How is the Isolation Valve normally controlled and by what?

A

It is normally controlled automatically by the ACSCs

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10
Q

When will the ISOL OPEN/CLOSED status message display?

A

Whenever the bleed isolation valve is in either the fully open or closed configuration.

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11
Q

When will the “BLEED MISCONFIG” caution occur?

A

When in the manual mode and an impossible bleed configuration exists.

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12
Q

When the bleed valves selector knob is in manual and what does the bleed source selector knob do and what are the four options?

A

Allows you to change the bleed air source to one of the following:

  1. Both engines
  2. L engine
  3. R engine
  4. APU
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13
Q

When an engine is selected as a bleed air source, what stages from the engine does the bleed air come from?

A
  1. The LP Bleed Air - 6th stage compressor port

2. The HP Bleed Air - 10th stage compressor port

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14
Q

When is the HPV opened and why?

A

The high pressure valve is opened when the ACSC determines low pressure (6th stage) bleed air is insufficient for system requirements.

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15
Q

When will the HPV close?

A

When the LP Stage air is sufficient to satisfy system demands

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16
Q

What is the purpose of the check valve installed on the LP Bleed air source?

A

To prevent HP bleed air from flowing into the LP port

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17
Q

Is the HPV shown on the ECS synoptic page?

A

Nope

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18
Q

What are PRSOVs?

A

Pressure Regulating Shut Off Valves

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19
Q

What is the purpose of PRSOVs?

A

Regulate bleed air system manifold pressure to approximately 45 PSI.

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20
Q

Are the PRSOVs shown on the ECS synoptic page?

A

Yup

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21
Q

“L/R ENG BLEED” status message will be displayed when?

A

The respective pack inlet pressure sensor has failed

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22
Q

“L/R ENG BLEED” Caution message will display when?

A

Failure of:

  1. HPV
  2. PRSOV
  3. Controller
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23
Q

When will the “L/R ENG BLEED CLSD” status message display?

A

When the respective engine bleed is not selected with the HPV and PRSOV closed

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24
Q

How high can the APU be used as a bleed air source?

A

25,000’

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25
Q

When will the APU BLEED ON caution message display?

A

When the APU is selected above 25,000’ as a bleed source

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26
Q

What side of the Bleed Air manifold is the APU routed to?

A

The left side

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27
Q

How can the bleed air from the APU be used as a source for the entire system?

A

By opening the isolation valve

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28
Q

What is the purpose of the LCV?

A

The Load Control Valve allows bleed air from the APU to enter the bleed air manifold

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29
Q

What is the purpose of the ECU with regards to the bleed air system?

A

The engine control unit modulates the Load Control Valve (LCV) to limit APU exhaust gas temperature.

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30
Q

If the “APU LCV OPEN/CLOSED” caution message appears, what does this tell you?

A

The APU LCV did not move to it’s commanded position

31
Q

Where is the external air connection located on the CRJ?

A

Located on aft left side of the fuselage below engine No. 1

32
Q

For External high pressure ground air source to be used for engine starting, what should we ensure?

A

The bleed valves must be selected closed to avoid reverse flow to the engines. Do this by setting the BLEED VALVES selector to CLSD

33
Q

What is the AILC and it’s purpose?

A

Anti-Ice and Leak Detection Controller, monitors pneumatic and anti-ice suction for high temperatures associated with bleed air leakage

34
Q

How does the AILC sense a bleed air leak?

A

It uses continuous sensing loops routed in parallel (2 of them) along pneumatic ducting

35
Q

What are the five zones of the AILC system?

A
  1. Left bleed
  2. Right bleed
  3. Left engine cowl
  4. Right engine cowl
  5. Wing
36
Q

How many loops must detect a leak of the leak detection system before an EICAS message is displayed?

A

2

37
Q

if both loops of leak detection system detect a leak, what will happen?

A

EICAS displays message indicating the faulty zone, allowing the crew to isolate the duct by closing appropriate shut-off valves

38
Q

What does the DUCT MON FAULT status message indicate?

A

Loss of redundancy in the bleed leak detection

39
Q

When will the “ANTI ICE DUCT” warning message display?

A

When a bleed air leak has been detected in the wing anti-ice ducting or piccolo tubes

40
Q

If a “ANTI-ICE DUCT” warning message occurs, what will the AILC do?

A

AUTOMATICALLY select the respective system off.

41
Q

When will “ANTI-ICE DUCT” caution be displayed on the CAS?

A

If there is a leak detected in the wing anti ice system, the AILC closes the wing anti-ice valves, BUT the crew doesn’t select the system to off.

42
Q

Describe the Cowl Anti-Ice system.

A

Consists of an inner and outer duct, hot bleed air travels through the inner duct. The space between the inner and outer duct is monitored for pressure changes, which if a large enough one is detected, will trip the AILC to close the affected areas valves.

43
Q

How are the Bleed-air leak detection system loops tested?

A

Automatically upon power-up

44
Q

How do you know if the leak detection system loop test was successful?

A

There’s no message displayed if it was

45
Q

If an anti-ice loop caution message appears, what happened?

A

Both WING anti-ice leak detection loops failed the test.

46
Q

With the Bleed valves switch selected to MANUAL, where is the BLEED MANUAL text displayed?

A

On the ECS synoptic page and Status Page.

47
Q

What is the pressure regulated to in the bleed air manifold?

A

45 PSI

48
Q

Can you use the APU to run the Anti-Ice system?

A

No

49
Q

If the cowl anti-ice switch is selected ON with the APU manually selected as the bleed air source, what caution message will appear and why?

A

BLEED MISCONFIG; because APU can’t supply adequate bleed air to handle the Anti-ice system.

50
Q

What is the minimum PSI required for cross-engine bleed start?

A

42 PSI

51
Q

Which Bleed air valves will fail-open?

A

COWL anti-ice shutoff valves

52
Q

Where will the isolation and wing anti-ice cross bleed valves go if they fail and why?

A

They’ll fail where they’re at because they are electronically controlled and electronically actuated.

53
Q

What are the only bleed air valves that will fail close?

A

All except Cowl anti-ice (fail open), isolation (fail where it’s at, electric operated), an the wing anti-ice cross bleed valve (fail where it’s at, electric operated)

54
Q

Any time you’re single engine, you’re ______ pack.

A

Single

55
Q

ANTI ICE CAUTION means what?

A

The wings aren’t warm enough yet.

56
Q

Who does the isolation valve open during single engine operation?

A

To provide bleed air available to the offside pack in case we need to use it.

57
Q

What prevents the cowl anti-ice valve from opening during single-engine operation?

A

Control system logic

58
Q

Normally in flight, the whole bleed air system is _________.

A

On side related

59
Q

AILC

A

Anti-Ice Leak Detection Controllers.

60
Q

What do AILCs do?

A

Monitors temperature of the bleed air and anti ice ducting and will shut down a bleed air section that is leaking.

61
Q

BLEED MISCONFIG means what?

A

APU manually selected, with anti-ice on.

62
Q

What could happen if the WING OVHT warning is false?

A

The AILC will close wing anti-ice shutoff valves, message won’t go away so it closes the PRSOVs which results in no more bleed air going to the L and R PACKs

63
Q

What do the packs normally supply air to?

A

Left Pack: Flight deck (70-85%)

Right Pack: Passenger Compartment (70-85%)

64
Q

If you have a right pack deferral, what should you brief the FA on?

A

Don’t use the galley heater.

65
Q

What do PACKS produce?

A

Produce cool air.

66
Q

How is the AC temperature controlled and selected?

A

Controlled by letting more or less hot air bypass through the temperature regulating valve and selected using the AC panel.

67
Q

Should we use high pressure ground air to run the packs?

A

No because they typically have only enough air in them for 6 engine starts.

68
Q

DISPLAY COOL caution means what and what should we do about it?

A

Fan quit, if on ground go to GRD ALT, if in the air, go to FLT ALT.

69
Q

What is the maximum altitude to select “EMER DEPRESS”?

A

15,000’

70
Q

STBY on the display FAN knob will do what?

A

Turns both display fans off.

71
Q

When can we use Low-pressure ground air?

A

Passenger door OR avionics bay door must be open.

72
Q

When is the only time you would use RAM air?

A

If both packs are failed and not on.

73
Q

The Display cooling EICAS message relays on _______ sensors

A

Flow sensors… not temperature

74
Q

The CPAM is the primary interface with the DCU’s providing Cautions and Warnings. The static source used is provided from ________

A

S3

Part 121 - CRJ 701/900 (25 decks)

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