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M11 > 11.16 Pnuematics > Flashcards

11.16 Pnuematics Flashcards

1
Q

What uses pneumatic energy? (4)

A
  • engine starting
  • cabin pressurisation and air conditioning
  • wing anti ice
  • water reservoir and hydraulic pressurisation
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2
Q

How can pneumatics be supplied? (3)

A
  • engine
  • apu
  • high pressure ground connectors
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3
Q

What is required to maintain a constant level of pressure?

A

Pressure regulator

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4
Q

What are the different type of compressor stages? [2]

A
  • intermediate pressure (IP)

- high pressure (HP)

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5
Q

When the HP stage is being used to supply pneumatics, what is used to protect the engine compressor from back flow?

A

Check valve

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6
Q

What is used as a shut off to the APU?

A

APU bleed valve

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7
Q

What is used to cool the engine bleed air?

A

Built in precooler

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8
Q

Where is the cooling air taken from to cool the engine bleed air?

A

Engine fan duct (fan air)

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9
Q

What is used to vary the amount of cool air entering the pre cooler?

A

Fan air valve

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10
Q

What are the names of the ducts that distribute pneumatics? (4)

A
  • Pylon duct
  • left and right wing ducts
  • apu duct
  • crossover duct (cross bleed manifold)
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11
Q

Where is the cross bleed manifold usually located? And what does it connect?

A

In the fuselage connecting the left and right wing ducts

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12
Q

What are the pneumatic ducts monitored by?

A

A leak detection system

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13
Q

What controls the pneumatics? [2]

A
  • Pneumatic controller (automatically)

- Pneumatic controller panel in flight deck (manual)

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14
Q

How many pneumatic controllers are there?

A

One for each engine bleed air system

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15
Q

What is the role of the pneumatic controller? (3)

A
  • monitor pressure and temperature,
  • register leaks
  • monitor operation if pneumatic components
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16
Q

Which valve usually regulates the pressure and shut off?

A

Bleed valve

17
Q

If the pressure regulator and shut off valve were two separate components, by how much more PSI would the pressure regulator control the pressure?

A

20psi above

18
Q

What is the usual pressure of the pneumatic system?

A

45 psi

19
Q

What type of valve is the bleed valve?

A

Butterfly type and pneumatically operated

20
Q

What functions does the bleed valve have? (5)

A
  • Shut off function
  • pressure regulation
  • check valve function
  • over temperature control function
  • reverse flow function
21
Q

How does a pneumatically operated butterfly valve operate?

A

Spring loaded and pressure will override the spring tension and move the piston upwards opening the valve

22
Q

How does shut off function work on a butterfly valve?

A

The shut off switch energises a solenoid which opens a port to ambient releasing pressure and closing the valve

23
Q

What is the purpose of the bleed valve check valve? [2]

A
  • To prevent an imbalance of pressure between both sides of the valve,
  • to protect the engine of a compressor stall (disturbed air flow)
24
Q

What does the temperature of the pneumatic system need to between after going through the precooler?

A

160 and 200 degrees c

25
Q

Where is the thermostat located?

A

Downstream of the precooler

26
Q

What happens if an over temperature occurs after the precooler ?

A

It can open an ambient bleed port or close the bleed valve

27
Q

When might the reverse flow function be used?

A

To start the engines

28
Q

During an overpressure situation, at what psi will the valve be fully closed?

A

85psi

29
Q

What 2 methods of over pressurisation protection is there?

A
  • Pneumatically operated butterfly valve

- pressure switches connected to flight deck

30
Q

What is usually used as a precooler?

A

An air to air heat exchanger

31
Q

How does an air to air heat exchanger work?

A

Cools hot engine bleed air by cross flowing it with cold air

32
Q

What type of valve is the fan air valve?

A

Pneumatically operated butterfly valve

33
Q

What controls the amount of air the fan air valve allow passing through it?

A

Temperature sensor located down stream of the precooler

34
Q

How big are the connections for the high pressure ground connectors?

A

3 inches

35
Q

What is the result of a duct leak?

A

Overheat

36
Q

What happens if an over heat condition occurs because of a leak?

A

The effected engine bleed air system is shut off automatically by the pneumatic controller or manually

M11 (22 decks)

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