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M11 > 11.16 Pneumatic Systems > Flashcards

11.16 Pneumatic Systems Flashcards

1
Q

What are the 3 sources a pneumatic system gets its power from?

A

engines, APU & GPU

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2
Q

What are the 3 main parts of a pneumatic duct system?

A

left wing ducts, right wing ducts & crossover ducts

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3
Q

What psi does a low pressure system produce, where does it get it from & what is it used for?

A

1-10psi, from engine or APU, used for anti-icing

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4
Q

What psi does a medium pressure system produce, where does it get it from & what is it used for?

A

50-150psi, from compressor section of turbine engine & used to pressurize reservoirs in a hydraulic system

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5
Q

What psi does a high pressure system produce, where does it get it from & what is it used for?

A

1000-3000psi, from metal bottles, used in pneumatic braking system

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6
Q

When is LP & IP bleed air used?

A

during take-off, climb & cruise

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6
Q

What 3 places is air bled of an engine compressor from & what type?

A

LP bleed port (twin shaft), IP bleed port (triple shaft) & HP bleed port

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7
Q

When is HP bleed air used?

A

when LP & IP bleed air is inadequate

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8
Q

When is APU bleed air available?

A

APU running above 95%

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9
Q

What are the 2 types of positive displacement, vane type vacuum pumps?

A

wet pumps & dry pumps

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10
Q

What are positive displacement, vane type vacuum pumps driven by?

A

engine accessory drive

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11
Q

How are wet pumps lubricated?

A

from engines LP oil system

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12
Q

What is the function of a separator in a wet pump?

A

Captures oil to prevent oil streaks across the fuselage

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13
Q

How are dry pumps lubricated?

A

self-lubricated

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14
Q

What are the vanes & rotor made of in a dry pump design?

A

carbon

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15
Q

What are the vanes made of in a wet pump design?

A

steel

16
Q

What do Pressure Relief Valves (PRV) function as in a pneumatic system?

A

pressure limiting units

17
Q

What keeps a PRV in the closed position?

A

spring

18
Q

What is the duct pressure controlled to?

A

20psi

19
Q

How is the Fan Air Valve (FAV) operated and what type of valve is it?

A

pneumatically operated - butterfly valve

20
Q

What is the purpose of flow sensors?

A

monitor air supply in the distribution system

21
Q

What is used to control the pneumatic system manually & then automatically

A

Pneumatic control panel - pneumatic controller

22
Q

What is the main parameter controlled in the flight deck?

A

pneumatic manifold pressure

23
Q

Where is the isolation valve control switch located?

A

overhead panel in the flight deck

24
Q

Where are the overtemperature & duct sensors located, what are they controlled by?

A

ducting system - pneumatic controller

25
Q

What is used to turn the core engine spool during engine starting?

A

pneumatic power

26
Q

What is the function of the overpressure valve & when does it open?

A

protects users against overpressure - opens in case of PRV malfunction

M11 (11 decks)

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