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SAAB > Pneumatics > Flashcards

Pneumatics Flashcards

1
Q

What compressor stage is HP air taken from?

A

6th

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2
Q

What compressor stage does P3 air come from?

A

6th

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3
Q

What compressor stage does P2.5 air come from?

A

5th

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4
Q

How is the HP valve controlled

A

Electrically

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5
Q

How are HP valve operated?

A

Pbeumatically

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6
Q

What are the reasons the HP valve would automatically close?

A 
Bleed air over temp (288 deg C)
  Bleed air over pressure (76 PSI)
 Fire handle is pulled
   Engine is shut down
   Main DC bus power is lost
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7
Q

➢What are the reasons the LP valve would automatically close?

A

Bleed air over temp (288 C)
Bleed air over pressure downstream of valve (43 PSI)
Fire handle is pulled
Air conditioning pack over temps (225 C)
Air conditioning duct over temps (82 C)

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8
Q

What does a BLD CLOSED light indicate?

A

Bleed valve is closed

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9
Q

➢What does a BLD FAULT light indicate?

A

Bleed air temperature excessive (>288 C)
Regulated pressure excessive (>43 PSI)
Valve fails to close when signaled to close

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10
Q

➢What does a HP HIGH light indicate?

A

Valve fails to close when signaled to close

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11
Q

➢Are the pneumatic systems interconnected?

A

Yes, cross valve

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12
Q

When can cross valve be used?

A

On the ground only

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13
Q

What is required for the XVALVEto open?

A

One engine bleed valve closed

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14
Q

How is the XVALVE controlled?

A

Electrically

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15
Q

How is XVALVE operated?

A

Pneumatically

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16
Q

What does a XVALVE OPEN light indicate?

A

Cross valve open

17
Q

What does a RECIRC light indicate?

A

Recirculation fan underspeeds

18
Q

Does manual mode provide temp limiting?

A

No, only auto mode does

19
Q

➢In manual mode how long does it take to move the control valve full travel ?

A

6 to 8 seconds

20
Q

What does a AVIONICS VENT light indicate?

A

Fault occurs in the avionics vent fan

21
Q

When is the only time HP air is automatically provided?

A

When LP is insufficient (Ng

22
Q

➢If electrical power fails what position will the LP valve be in?

A

Open

23
Q

➢If electrical power fails what position will the HP valve be in?

A

Closed

24
Q

On the air conditioning panel an amber DUCT OV TEMP indicates?

A

ACM compressor discharge overheating

Distribution duct over heating

25
Q

What other valve automatically closes with this light?

A

Corresponding engine bleed valve

26
Q

➢What cools the Recirc fan?

A

Bleed air

27
Q

Will the AIRCOND master caution activate with a RECIRC amber light?

A

No

28
Q

The temperature control knobs sets cabin temp to what range in the AUTO mode?

A

18 to 29 C

29
Q

➢Is the RECIRC fan temperature protected?

A

Yes, thermal cutoff will turn off till it cools then allows fan to turn on

30
Q

What does the CABIN PRESS light indicate?

A

Cabin altitude above 10,000 ft

Cabin pressure exceeds 7.5 PSI

31
Q

What controls the outflow valves?

A

Electric and Pneumatic

32
Q

In flight, activation of PRESS DUMP opens?

A

Primary outflow valve

33
Q

What compressor stage is the LP air taken from?

A

5th

34
Q

➢On ground, activation of PRESS DUMP?

A

Primary and secondary outflow valves fully open

35
Q

The outflow valves limit negative pressure to?

A

-0.5 PSI

36
Q

If vacuum pressure is lost, the outflow valves revert to?

A

Closed

37
Q

➢In manual pressurization mode what position is the primary outflow valve in?

A

Closed

38
Q

Where is the secondary outflow valve located?

A

Rear pressure bulkhead

39
Q

What rate of cabin VSI does the detent on the auto controller provide?

A

500 fpm up and 300 fpm down

SAAB (2 decks)

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