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KA-400 > Pneumatics > Flashcards

Pneumatics Flashcards

1
Q

What Systems do the Pneumatics power?

A

Air Conditioning,
Pressurization,
Wing and Engine Anti-ice,
Potable Water Pressure,
Engine Starters,
Pressurization of the Hydraulic System Reservoirs.
Aft Cargo Heat,
Leading Edge Flaps,
Hydraulic System Demand Pumps.

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2
Q

How many pneumatic systems are there?

A

3

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3
Q

How are the three pneumatic systems powered?

A

Left - Engine 1/2
Center - APU/ HP ground
Right- Engine 3/4
All systems are interconnected

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4
Q

Where is the pneumatic synoptic located?

A

EICAS ECS page

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5
Q

T/F: High Pressure Air can be provided by engine bleed air, APU bleed air, or a ground source.

A

True

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6
Q

The APU can provide high pressure air to the system in flight up to what altitude?

A

15,000’

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7
Q

What do the Left and Right Sections provide power to?

A

Air Conditioning Pack
LE Flaps
Wing Anti-ice
Associated Air Driven Hydraulic Demand Pump
Associated Hydraulic System reservoirs for the respective side (reservoir 1 and 2 on the left side; reservoir 3 and 4 on the right side).

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8
Q

What are the components of the Engine Bleed air system?

A

Intermediate Pressure (IP) stage
High Pressure (HP) stage
Pressure Regulating Valve (PRV)
Fan Precooler
Engine Bleed Valve.

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9
Q

What occurs when an Engine Bleed Air Switch is OFF?

A

Switch Shows amber OFF
HP valve Closed
PRV Closed
Engine Bleed valve Closed
amber OFF is displayed anytime the Engine bleed valve is closed

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10
Q

When would the IP stage provide bleed air?

A

At high thrust settings

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11
Q

When does the HP stage provide bleed air?

A

At idle or reduced thrust settings

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12
Q

What the purpose of the PRV?

A

Limit bleed air pressure to prevent damage.

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13
Q

What is the purpose of the ENGINE BLEED VALVE? and how does it operate?

A

Control bleed air delivery, they are Electronically controlled and pneumatically operated.

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14
Q

If an ENGINE BLEED VALVE is ON, when will the valve open?

A

When the engine provides forward air pressure.

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15
Q

What happens to the ENGINE BLEED VALVE when another source of bleed air is higher?

A

It closes to prevent reverse airflow from the duct to the airflow.

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16
Q

What are the pneumatic valve positions during engine start?

A

ENGINE BLEED VALVE is Open
PRV is closed (to prevent reverse airflow into the compressor)

17
Q

During normal start what happens to the valves as N2 reaches 50%?

A

Start Valve closes
PRV opens to allow forward airflow

18
Q

What happens if the start valve does not close after start?

A

PRV and bleed valve will remain positively closed, and engine nacelle anti-ice is not available.

19
Q

How does the fan precooler function?

A

By using ducted airflow from the engine fan.

20
Q

What will a bleed air Amber SYS FAULT illuminate for?

A
  • bleed air overheat
  • bleed air overpressure
  • HP bleed valve open when it is commanded closed
  • PRV open when it is commanded closed.
21
Q

What message would accompany a bleed air overheat?

A

Amber BLD 1,2,3,4, OVHT/PRV EICAS message

22
Q

With engine running and the BLEED Air switch ON, when would Nacelle anti-ice not be available?

A
  • PRV has failed closed
  • PRV is closed as a result of a detected bleed air overheat
  • Engine start valve has not closed.
23
Q

With engine running and the BLEED Air switch OFF, when would Nacelle anti-ice not be available?

A
  • PRV has failed closed
  • PRV is closed as a result of a detected bleed air overheat
  • the engine start valve has not closed
  • the HP bleed valve has failed open.
24
Q

How does the APU bleed valve work?

A

It is a one way check valve to allow, to prevent reverse flow into the APU.

25
Q

What does the Amber valve like on the APU bleed valve indicate?

A

A switch position disagreement with the valve.

26
Q

How is an APU duct leak is detected? What happens?

A

Overheat detectors
The APU will shut down automatically and cannot be restarted.

27
Q

What duct pressure information do we have? Where is it located?

A

Only the Left and Right systems
ECS page of the EICAS

28
Q

What happens in the event of the Left or Right section isolation?

A
  • Affected LE Flaps will not be pneumatically operated
  • Max of 1 pack should be on
29
Q

What happens when Trim Air is OFF.

A

The temperature control of the cabin zones operates in a backup temperature control mode.

30
Q

What should the crew do in the event Center section isolation?

A

AFT cargo heat to OFF
Should not operate the APU bleed or HP bleed

31
Q

What does the air flow display on the ECS page represent?

A

Valve and switch position, not an actual display of airflow.

32
Q

Caution BLD DUCT LEAK L, C, or R EICAS message

A

Bleed air leak or overheat detected in associated sections.

33
Q

Advisory BLD 1,2,3, 4 OVHT/PRV EICAS message

A

An associated engine bleed air overheat is detected or if t
he associated PRV has failed closed.

34
Q

Advisory BLEED 1,2,3, 4 EICAS message

A

Engine bleed air overpressure, or if the associated HP bleed valve or PRV has failed to close when commanded.

35
Q

Advisory HP ENG 1,2,3, 4 EICAS message

A

The associated HP bleed valve has failed closed.

36
Q

Advisory BLEED ISLN L,R EICAS message

A

The position of the associated Isolation Valve switch disagrees with the position of the isolation valve

37
Q

Advisory APU BLEED ISLN EICAS message

A

The APU bleed isolation valve position disagrees with the commanded position.

38
Q

Advisory BLEED 1,2,3,4 OFF EICAS message

A

The Engine BLEED Air switch is OFF and the associated engine bleed air valve is closed when the engine is operating.

39
Q

How many Sections does the pneumatic system have?

A

3

KA-400 (33 decks)

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