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Q400 > Pneumatics > Flashcards

Pneumatics Flashcards

1
Q

What is ECS?

A

Environmental control system

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2
Q

What is BAS?

A

Bleed air system

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3
Q

Does bleed air use high or low pressure compressor ports? What are they called?

A

Both
Low pressure P2.2 P2.7
High pressure P3.0

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4
Q

What regulates which bleed air port is used? Ie when high pressure is used and when low pressure is used?

A

The Electronic Control Unit together with power lever position

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5
Q

At high power settings which bleed air supply is used? And at low pressure setting which bleed air is used?

A

High power = low pressure bleed air
Low power = high pressure P3.0

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6
Q

What does the ECU do?

A

The interface between ECS control panel and the Bleed Air system components

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7
Q

What is the redundancy for the ECU?

A

Digital and analogue control channels

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8
Q

What do the digital channels control?

A

High pressure shutoff valve (HPSOV)
P2.2 Shutoff valves
Flow control shutoff valves (FCSOV)

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9
Q

If a digital channel fails what happens?

A

The ECU analogue channel will take control

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10
Q

After a failure of the digital control and the analogue takes over what can it control?

A

Low press bleed air operation

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11
Q

What valve will close when under analogue control?

A

High pressure shutoff valve

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12
Q

Turning the bleed air switch on enables operation of what valve?

A

Nacelle Flow Control Shutoff Valve (FCSOV) and P2.2

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13
Q

Is bleed air available if selected OFF for de ice?

A

Yes

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14
Q

What do the MIN, NORM and MAX cause the ECU to do?

A

To modulate bleed air by controlling the nacelle flow control shut off valves (FCSOVs)

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15
Q

Does the MIN NORM MAX selector affect APU bleed air flow?

A

No

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16
Q

1 or 2 BLEED HOT caution light cause and what auto happens?

A

Supply duct more than 349 degrees Celsius
The ECU closes the HPSOV and the FCSOV until the temperature returns to normal

17
Q

Do the HPSOV AND FCSOV fail open or closed?

A

Fail closed but will still allow bleed air to be supplied to the de icing

18
Q

When will bleed air default to min regardless of the switch position?

A

A bleed hot caution light
A bleed switch is off
Or from an engine shutdown

19
Q

If the analog and digital channels of the ECU fail on one side will the bleed hot caution light illuminate?

A

No

20
Q

With a failure of both left digital and analogue ECU channels, the #1 BLEED HOT caution light is ?

A

Unable to illuminate if a triggering condition exists

21
Q

The BLEED selector knob (MIN/NORM/MAX) allows regulation of bleed air flow through the ECS by ?

A

Controlling the Nacelle Flow Control Shutoff Valves (FCSOV)

22
Q

For the APU to supply bleed air ?

A

The #1 and #2 BLEED switches must be selected off

23
Q

The bleed air switches on the overhead panel control operation of their associated ?

A

Nacelle flow control shutoff valve (FCSOV)

24
Q

When the Environmental Control System ECU is under analogue control ?

A

The high pressure shutoff valve (HPSOV) will default to closed

25
Q

When an over temperature condition is experienced, the associated bleed air system will ?

A

Become operational when the temperature returns to the normal range

26
Q

If the #1 BLEED HOT light illuminates during flight and continuously remains illuminated the likely cause is ?

A

Either an over-pressure condition or duct leak being detected

27
Q

At high power settings, bleed air to the Environmental Control System and subsystems are supplied by ?

A

The low pressure port

28
Q

Bleed air for the Environmental Control System is provided by ?

A

The low pressure (P2.7) and high pressure (P3.0) ports

29
Q

For the high stage pre-cooler to be operational ?

A

The P2.2 Shutoff Valve (SOV) must be open

Q400 (33 decks)

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