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Crj 900 > Pneumatics > Flashcards

Pneumatics Flashcards

0
Q

How is a leak detected in the cowls

A

By a pressure transducer

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1
Q

What is a APU interlock protection

A

Prevents APU from supplying air

If engine bleed source is open

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2
Q

AILC?

A

Anti-ice and leak detection controller

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3
Q

What does the AILC provide?

A

EICAS msgs and system control of the bleed air leak detection system

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4
Q

Wing anti-ice is divided into how many sections

A

Four loops

L/R FUSELAGE LOOPS

L/R WING LOOPS

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5
Q

How are the leading edges heated

A

Hot bleed air from the duct is released through piccolo tubes

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6
Q

What detects failures in wing anti-ice ducting

A

Dual loops

And

A skin temperature sensor in wing leading edge

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7
Q

ACSC ( air-conditioning system controller) provides what during starts?

A

Isol valve opens/closes automatically during starts

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8
Q

How many zones is the pneumatic system divided into

A

5

L BLEED
R BLEED
L COWL
R COWL
WING ANTI ICE
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9
Q

Low pressure air?

High pressure air?

A

6th stage

10th stage

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10
Q

What’s manages the distribution of bleed air?

A

2 ACSC’s

Air conditioning system controllers

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11
Q

APPCH BIT … Landing

When do bleeds switch from engine to APU if bleeds closed are needed for landing

A

APPCH BIT

Either engine available

FLAPS greater then 20 degrees

               Or

Ldg gear down

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12
Q

What does AILC(anti-ice and leak detection controller) do. If leak is detected

A

Sends signal to close valves to isolate system

only for leaks not overheat.. Wing overheat

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13
Q

APPCH BIT … Takeoff

When do bleeds transfer from APU to the engines on take off if bleeds closed needed

A

Landing gear up

  AND

flaps 20 or less

Tl out of toga

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14
Q

Does anything close automatically for a wing overheat

A

No

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15
Q

What prevents compressor surge for the APU

A

Surge control valve

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16
Q

What monitors the bleed system for leaks

A

AILC anti-ice in leak detection controller

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17
Q

Pneumatically operated aircraft systems include:

A

Engine starting
Cowl and wing anti-ice
Air-conditioning and pressurization

  • managed by two air conditioning system controllers(ACSC)
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18
Q

Test

A

The ACSC Will open or close the HPV depending on the bleed air manifold pressure and aircraft system requirements

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19
Q

What’s modulates the APU bleed air to the load control valve

A

ECU

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20
Q

TEST

BLEED MISCONFIG. amber

A

Indicates on impossible bleed configuration in manual mode

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21
Q

The bleed air leak detection system monitors

A

The pneumatic and anti-ice ducting for high temperatures associated with the bleed air leakage

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22
Q

EICAS Messages and system control of the bleed air leak detection system is provided by

A

On anti-ice and leak detection controller

AILC

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23
Q

The bleed air leak detection system is divided into five zones

A

Left and right bleed zone
Left and right, cowl anti-ice zones when anti-ice zone.

( when anti-ice zone is subdivided into four loops… Left and right fuselage loops, left and right wing loops)

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24
Q

The wing anti-ice loops ducting is encased in a protective cover, if a leak occurs …

A

Holes in the protective cover direct the hot bleed air towards the sensing loops

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25
Q

The cowl anti-ice ducts located in the engine pylons consists of

A

Inner and outer ducts

Bleed Air For anti-icing travels through the inner duct

The area between the inner and outer duct is monitored by a pressure transducer

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26
Q

The pneumatic system is supplied bleed air pressure from

A

The engine compressors

For the APU compressor

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27
Q

Manifold pressure is regulated to

A

45 PSI by the pressure regulating shut off valve(PRSOV)

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28
Q

Maximum altitude for engine starting with the APU

29
Q

Maximum altitude for APU bleed air

30
Q

Engines supply high or low pressure bleed air depending on

A

The high pressure valve(HPV)

31
Q

What manages the distribution of bleed air?

A

Two independent air conditioning system controllers ..ACSCs

32
Q

ACSC1 controls?

ACSC2 controls?

A

1… Left HPV and left engine bleed valve
APU LCV
Isolation valve

2… Right HPV and right engine bleed valve

33
Q

PRSOV Is shown in two places

A

ECS synoptic page

Anti-ice synoptic page

34
Q

What controls the isolation valve

35
Q

What provides interlock protection

A

ACSC

Prevents APUfrom supplying bleeder if any engine bleed source is open

36
Q

What “modulates “ the APU LCV

A

The electronic control unit ECU

37
Q

What is used for bleed air leak detection in the aft equipment be fuselage and wing

A

Dual heat sensing loops

38
Q

What provides ice detection on the wing outermost slats

A

Only temperature sensors

39
Q

Engines supply high or low pressure bleed air depending on

A

The high pressure valve(HPV)

40
Q

What manages the distribution of bleed air?

A

Two independent air conditioning system controllers ..ACSCs

41
Q

ACSC1 controls?

ACSC2 controls?

A

1… Left HPV and left engine bleed valve
APU LCV
Isolation valve

2… Right HPV and right engine bleed valve

42
Q

PRSOV Is shown in two places

A

ECS synoptic page

Anti-ice synoptic page

43
Q

What controls the isolation valve

44
Q

What provides interlock protection

A

ACSC

Prevents APUfrom supplying bleeder if any engine bleed source is open

45
Q

What “modulates “ the APU LCV

A

The electronic control unit ECU

46
Q

What is used for bleed air leak detection in the aft equipment bay fuselage and wing

A

Dual heat sensing loops

47
Q

What provides ice detection on the wing outermost slats

A

Only temperature sensors

48
Q

What shuts down pack during overtemp condition?

49
Q

Failure of a single loop is indicated by?

A

DUCT MON FAULT status

Or

WING A/I FAULT status

50
Q

The bleed air manifold is divided into two sections by the?

A

Isolation valve

51
Q

The left side of the bleed air manifold is pressurized by?

Right side?

A

Left side? Pressurized by external air source APU or the left engine

Right side? Pressurized by the right engine

(divided by the isolation valve)

52
Q

Bleed valves fail?

53
Q

What stage ”normally “ Provides air to operate the systems?

A

6 th stage

10 stage opens when the system demands exceed the capability of the six stage

54
Q

Are there EICAS indications for the HPV operation?

A

No.. 18-4 pneumatics

55
Q

APU LCV is fail safe?

56
Q

Does manually selecting. The isolation valve open or closed override the systems protective features?

57
Q

The active channel assignment of the AC SC is automatically switched?

A

Daily

18-6

58
Q

If taxiing with the APU on And wing and or Cowl anti-ice is selected, What will happen

A

the ACSC Will command the APU LCV closed and the bleed valves open

18-8

59
Q

If the APU is manually selected as the beed source And anti-ice is selected on?

A

apu lcv remains open

BLEED MISCONFIG

18-8

60
Q

What opens to start the flow of 10th stage air until the sixth stage repressurizes?

A

HPV. High pressure valve

61
Q

With ACSC number one working, What does number 2

Control?

A

Right PRSOV

right
HPV

62
Q

How many zones are monitored by the bleed air leak detection system?

63
Q

The AILC continuously checks ??

A

cowl anti icing ducts

Wingbanti icing ducts

64
Q

The Wings leading edges bleed air leak detection is provided by Dual loops and??

A

Temperature sensors

65
Q

Where is the bleed air Manifold located

A

In the engine pylons and aft equipment bay

Divided into two sections by the isolation valve

66
Q

Are there any indications of the HPV operation on the EICAS?

A

No!! 18-4 ch 18 pneumatics 6/8/20

Just the PRSOV

67
Q

Active channel assignment for the ACSC’s is automatically switched?

A

Daily. 18-6 ch 8 pneumatic 6/8/20

68
Q

When do the bleeds transfer from the APU back to the engines after takeoff with the APU operating?

A

Landing gear up and flaps 20 or less …

Thrust levers out of takeoff detent

18-8 ch8Pneumatics6/8/20

69
Q

If landing with the APU operating for bleed air .. when will the bleeds switch from the engines to the APU?

A

Flaps greater than 20

Or

Landing gear down

18/9 chapter 8 pneumatics 6/8/20

70
Q

Regarding the bleed air leak detection system how many dual sensing loops must detect a leak before a EICAS messages posted?

A

Both loops Must detect a leak before a message is posted

18-11 Chapter 8 pneumatics

71
Q

The APU LCV is controlled by?

Crj 900 (45 decks)

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