SAAB 340B Pneomatics Flashcards by Ian dashp

Q

What compressor stage is the LP air taken from?

A

5th

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Q

What compressor stage is HP air taken from?

A

6th

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Q

What compressor stage does P3 air come from?

A

6th

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Q

What compressor stage does P2.5 air come from?

A

5th

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Q

How is the HP valve controlled?

A

Electrically

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Q

How is the HP valve operated?

A

Pneumatically

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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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Q

What are the reasons the HP valve would automatically close?

Reason 2

A

Bleed air over pressure (76 PSI)

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Q

What are the reasons the HP valve would automatically close?

Reason 3

A

Fire handle is pulled

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Q

What are the reasons the HP valve would automatically close?

Reason 4

A

Engine is shut down

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Q

What are the reasons the HP valve would automatically close?

Reason 5

A

Main DC bus power is lost

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Q

What are the reasons the LP valve would automatically close?

Reason 6

A

Bleed air over temp (288 C)

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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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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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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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Q

What does a BLD CLOSED light indicate?

A

Bleed valve is closed

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Q

What does a BLD FAULT light indicate?

1

A

Bleed air temperature excessive (>288 C)

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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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Q

What does a HP HIGH light indicate?

A

Valve fails to close when signaled too close

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Q

How is HP air cooled?

A

Ram air heat exchanger, Precooler

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Q

Are the pneumatic systems interconnected?

Study These Flashcards

A

Yes, cross valve

Q

When can the cross valve be used?

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A

On the ground only

Q

What is required for the XVALVE to open?

Study These Flashcards

A

One engine bleed valve closed

Q

How is the XVALVE controlled?

Study These Flashcards

A

Electrically

How is the XVALVE operated?

Pneumatically

What does a BLD AIR LEAK light indicate?

Bleed air leak is detected (excessive temp 205 C)

What does a XVALVE OPEN light indicate?

Cross valve open

What does a RECIRC light indicate?

Recirculation fan underspeeds

Does manual mode provide temp limiting?

No, only Auto mode does

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

6-8 seconds

What does a AVIONICS VENT light indicate?

Fault occurs in the avionics vent fan

What systems are operated by pneumatic air?

Air Conditioning, Pressurization, Boots

When is the only time HP air is automatically provided?

When LP is insufficient (Ng < 80%)

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

Open

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

Closed

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

ACM compressor discharge overheating - Distribution duct over heating

What other valve automatically closes with this light?

Corresponding engine bleed valve

What cools the Recirc fan?

Bleed air

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

No

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

18-29 C

Is the RECIRC fan temperature protected?

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

What does the CABIN PRESS light indicate?

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

What controls the outflow valves?

Electric and Pneumatic

In flight, activation of PRESS DUMP opens?

Primary outflow valve

On ground, activation of PRESS DUMP?

Primary and secondary outflow valves fully open

The outflow valves limit negative pressure to?

-0.5 PSI

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

Closed

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

Closed

Where is the secondary outflow valve located?

Rear pressure bulkhead

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

500 fpm up and 300 fpm down