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SAAB 340B > SAAB 340B Pneomatics > Flashcards

SAAB 340B Pneomatics Flashcards

1
Q

What compressor stage is the LP air taken from?

A

5th

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2
Q

What compressor stage is HP air taken from?

A

6th

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3
Q

What compressor stage does P3 air come from?

A

6th

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4
Q

What compressor stage does P2.5 air come from?

A

5th

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5
Q

How is the HP valve controlled?

A

Electrically

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6
Q

How is the HP valve operated?

A

Pneumatically

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7
Q

What are the reasons the HP valve would automatically close?

Reason 1

A

Bleed air over temp (288 deg C)

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8
Q

What are the reasons the HP valve would automatically close?

Reason 2

A

Bleed air over pressure (76 PSI)

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9
Q

What are the reasons the HP valve would automatically close?

Reason 3

A

Fire handle is pulled

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10
Q

What are the reasons the HP valve would automatically close?

Reason 4

A

Engine is shut down

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11
Q

What are the reasons the HP valve would automatically close?

Reason 5

A

Main DC bus power is lost

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12
Q

What are the reasons the LP valve would automatically close?

Reason 6

A

Bleed air over temp (288 C)

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13
Q

What are the reasons the LP valve would automatically close?

Reason 7

A

Bleed air over pressure downstream of valve (43 PSI)

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14
Q

What are the reasons the LP valve would automatically close?

Reason 8

A

Fire handle is pulled - Air conditioning pack over temps (225 C)

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15
Q

What are the reasons the LP valve would automatically close?

Reason 9

A

Fire handle is pulled - Air conditioning duct over temps (82 C)

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16
Q

What does a BLD CLOSED light indicate?

A

Bleed valve is closed

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17
Q

What does a BLD FAULT light indicate?

1

A

Bleed air temperature excessive (>288 C)

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18
Q

What does a BLD FAULT light indicate?

2

A

Regulated pressure excessive (>43 PSI) - Valve fails to close when signaled too close

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19
Q

What does a HP HIGH light indicate?

A

Valve fails to close when signaled too close

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20
Q

How is HP air cooled?

A

Ram air heat exchanger, Precooler

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21
Q

Are the pneumatic systems interconnected?

A

Yes, cross valve

22
Q

When can the cross valve be used?

A

On the ground only

23
Q

What is required for the XVALVE to open?

A

One engine bleed valve closed

24
Q

How is the XVALVE controlled?

A

Electrically

25
Q

How is the XVALVE operated?

A

Pneumatically

26
Q

What does a BLD AIR LEAK light indicate?

A

Bleed air leak is detected (excessive temp 205 C)

27
Q

What does a XVALVE OPEN light indicate?

A

Cross valve open

28
Q

What does a RECIRC light indicate?

A

Recirculation fan underspeeds

29
Q

Does manual mode provide temp limiting?

A

No, only Auto mode does

30
Q

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

A

6-8 seconds

31
Q

What does a AVIONICS VENT light indicate?

A

Fault occurs in the avionics vent fan

32
Q

What systems are operated by pneumatic air?

A

Air Conditioning, Pressurization, Boots

33
Q

When is the only time HP air is automatically provided?

A

When LP is insufficient (Ng < 80%)

34
Q

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

A

Open

35
Q

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

A

Closed

36
Q

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

A

ACM compressor discharge overheating - Distribution duct over heating

37
Q

What other valve automatically closes with this light?

A

Corresponding engine bleed valve

38
Q

What cools the Recirc fan?

A

Bleed air

39
Q

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

A

No

40
Q

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

A

18-29 C

41
Q

Is the RECIRC fan temperature protected?

A

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

42
Q

What does the CABIN PRESS light indicate?

A

Cabin altitude above 10,000 feet - Cabin pressure exceeds 7.5 PSI

43
Q

What controls the outflow valves?

A

Electric and Pneumatic

44
Q

In flight, activation of PRESS DUMP opens?

A

Primary outflow valve

45
Q

On ground, activation of PRESS DUMP?

A

Primary and secondary outflow valves fully open

46
Q

The outflow valves limit negative pressure to?

A

-0.5 PSI

47
Q

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

A

Closed

48
Q

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

A

Closed

49
Q

Where is the secondary outflow valve located?

A

Rear pressure bulkhead

50
Q

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

A

500 fpm up and 300 fpm down

SAAB 340B (8 decks)

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