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Crj 900 > Pneumatics > Flashcards

Pneumatics Flashcards

(72 cards)

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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
The wing anti-ice loops ducting is encased in a protective cover, if a leak occurs ...
Holes in the protective cover direct the hot bleed air towards the sensing loops
25
The cowl anti-ice ducts located in the engine pylons consists of
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
26
The pneumatic system is supplied bleed air pressure from
The engine compressors For the APU compressor
27
Manifold pressure is regulated to
45 PSI by the pressure regulating shut off valve(PRSOV)
28
Maximum altitude for engine starting with the APU
21000
29
Maximum altitude for APU bleed air
25000
30
Engines supply high or low pressure bleed air depending on
The high pressure valve(HPV)
31
What manages the distribution of bleed air?
Two independent air conditioning system controllers ..ACSCs
32
ACSC1 controls? ACSC2 controls?
1... Left HPV and left engine bleed valve APU LCV Isolation valve 2... Right HPV and right engine bleed valve
33
PRSOV Is shown in two places
ECS synoptic page Anti-ice synoptic page
34
What controls the isolation valve
ACSC
35
What provides interlock protection
ACSC Prevents APUfrom supplying bleeder if any engine bleed source is open
36
What "modulates " the APU LCV
The electronic control unit ECU
37
What is used for bleed air leak detection in the aft equipment be fuselage and wing
Dual heat sensing loops
38
What provides ice detection on the wing outermost slats
Only temperature sensors
39
Engines supply high or low pressure bleed air depending on
The high pressure valve(HPV)
40
What manages the distribution of bleed air?
Two independent air conditioning system controllers ..ACSCs
41
ACSC1 controls? ACSC2 controls?
1... Left HPV and left engine bleed valve APU LCV Isolation valve 2... Right HPV and right engine bleed valve
42
PRSOV Is shown in two places
ECS synoptic page Anti-ice synoptic page
43
What controls the isolation valve
ACSC
44
What provides interlock protection
ACSC Prevents APUfrom supplying bleeder if any engine bleed source is open
45
What "modulates " the APU LCV
The electronic control unit ECU
46
What is used for bleed air leak detection in the aft equipment bay fuselage and wing
Dual heat sensing loops
47
What provides ice detection on the wing outermost slats
Only temperature sensors
48
What shuts down pack during overtemp condition?
ACSC
49
Failure of a single loop is indicated by?
DUCT MON FAULT status Or WING A/I FAULT status
50
The bleed air manifold is divided into two sections by the?
Isolation valve
51
The left side of the bleed air manifold is pressurized by? Right side?
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
Bleed valves fail?
Closed
53
What stage ”normally “ Provides air to operate the systems?
6 th stage 10 stage opens when the system demands exceed the capability of the six stage
54
Are there EICAS indications for the HPV operation?
No.. 18-4 pneumatics
55
APU LCV is fail safe?
Closed
56
Does manually selecting. The isolation valve open or closed override the systems protective features?
No
57
The active channel assignment of the AC SC is automatically switched?
Daily 18-6
58
If taxiing with the APU on And wing and or Cowl anti-ice is selected, What will happen
the ACSC Will command the APU LCV closed and the bleed valves open 18-8
59
If the APU is manually selected as the beed source And anti-ice is selected on?
apu lcv remains open BLEED MISCONFIG 18-8
60
What opens to start the flow of 10th stage air until the sixth stage repressurizes?
HPV. High pressure valve
61
With ACSC number one working, What does number 2 | Control?
Right PRSOV right HPV
62
How many zones are monitored by the bleed air leak detection system?
5
63
The AILC continuously checks ??
cowl anti icing ducts Wingbanti icing ducts
64
The Wings leading edges bleed air leak detection is provided by Dual loops and??
Temperature sensors
65
Where is the bleed air Manifold located
In the engine pylons and aft equipment bay Divided into two sections by the isolation valve
66
Are there any indications of the HPV operation on the EICAS?
No!! 18-4 ch 18 pneumatics 6/8/20 Just the PRSOV
67
Active channel assignment for the ACSC’s is automatically switched?
Daily. 18-6 ch 8 pneumatic 6/8/20
68
When do the bleeds transfer from the APU back to the engines after takeoff with the APU operating?
Landing gear up and flaps 20 or less … Thrust levers out of takeoff detent 18-8 ch8Pneumatics6/8/20
69
If landing with the APU operating for bleed air .. when will the bleeds switch from the engines to the APU?
Flaps greater than 20 Or Landing gear down 18/9 chapter 8 pneumatics 6/8/20
70
Regarding the bleed air leak detection system how many dual sensing loops must detect a leak before a EICAS messages posted?
Both loops Must detect a leak before a message is posted 18-11 Chapter 8 pneumatics
71
The APU LCV is controlled by?
The ECU

Crj 900 (45 decks)

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