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M11 > 11.16 Pneumatic System > Flashcards

11.16 Pneumatic System Flashcards

1
Q

What is aircraft pneumatic energy used for?

A

. Engine starting
. Cabin press and air conditioning
. Wing anti ice
. Water reservoir pressurisation
. Hydraulic pressurisation

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2
Q

What is the main source of air for pneumatic system?

A

Engine compressor or APU

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3
Q

When on ground what can supply external air?

A

HP ground connectors

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4
Q

What does the change in thrust cause?

A

Varying amount of air pressure

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5
Q

What is used to maintain the constant level of pressure and regulate bleed supply?

A

Bleed valve (pressure regulator)

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6
Q

What type of valve is a bleed valve?

A

Pneumatically operated Butterfly valve

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7
Q

What PSI is most common in pneumatic system?

A

45 PSI

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8
Q

What are the two compressor stages?

A

HP - high pressure
IP - intermediate pressure

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9
Q

Does an APU have a pressure regulator valve?

A

No, just a shut off valve

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10
Q

What is the purpose of a pre cooler?

A

Cools the engine bleed temperature

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11
Q

Where is the cooling air taken from?

A

Engine Fan duct

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12
Q

What 2 components does the temperature regulation consist of?

A

. Precooler
. Fan air valve

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13
Q

How is pneumatic air distributed?

A

Via ducts

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14
Q

What are the pneumatic ducts monitored by?

A

Leak detection system

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15
Q

What is the role of the pneumatic controller?

A

. Monitors pressure temperature
. Registers leaks
. Monitors operation of pneumatic controllers

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16
Q

How many pneumatic controllers are there for each engine bleed system?

A

One for each engine bleed air system

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17
Q

What are the two main features of bleed valves?

A

. Butterfly type
. Pneumatically operated

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18
Q

What are the 5 functions of bleed valve?

A

. Shut off function
. Pressure regulation function
. Check valve function
. Over temp control function
. A reverse flow function

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19
Q

What valve regulates pressure?

A

Bleed valve

20
Q

When air pressure is great enough in open slide of actuator, what happens?

A

Overrides the spring force and moves piston

21
Q

What happens when shut off function is performed?

A

Bleed valve closes and no pneumatic air from engine is available

22
Q

What temperature does the precooler inlet air have to be?

A

160 degrees to 200 degrees

23
Q

What is used to monitor temperature?

A

Thermostate

24
Q

Where is the location of the thermostat in conjunction to the precooler?

A

Down stream of the precooler

25
Q

Where is the bleed valve located in conjunction to the precooler?

A

Upstream of the precooler (before)

26
Q

What is pressurised air used for in conjunction with the engines?

A

Start the APU by reverse flow function

27
Q

When is reverse flow of air allowed through the bleed valve?

A

Only for engine starts

28
Q

If failure of bleed valve happens, what is used to prevent over-pressurisation?

A

Over pressure valve

29
Q

What PSI is the over pressure valve fully closed at?

A

85 PSI

30
Q

What type of valve is an over pressure valve?

A

Pneumatically operated butterfly type valve that is spring loaded to open

31
Q

What type of valve is a bleed valve?

A

Pneumatically operated electrically controlled spring loaded closed

32
Q

What is the purpose of the pre cooler?

A

Cools engine bleed air system
(Air to air heat exchanger)

33
Q

What is the cooling air regulated by?

A

Fan air valve

34
Q

The temperature sensor measure the temp, if temp is high what happens?

A

Then More the fan air valve opens

35
Q

The temperature sensor measure the temp, if temp is low what happens?

A

The more the fan air valve closes

36
Q

What type of valve is HP?

A

Pneumatically operated butterfly valve, spring loaded to close

37
Q

When would HP Valve open and IP close?

A

HP = opens at low engine RPM
IP = opens at High engine RPM

38
Q

What are two other alternate ways of supplying pneumatic system?

A

. APU
. HP ground supply

39
Q

For HP ground supply what size is the ground connector?

A

3 inches

40
Q

How is APU bleed load valve controlled?

A

Switch in cockpit

41
Q

What is purpose of cross bleed valve?

A

Connects or isolates the left/ right bleed air system

42
Q

What is the cross bleed valve operated by?

A

Electric motor

43
Q

If there is a leak in an air duct, it results in overheating, what is this monitored by?

A

Overheat detection sensors

44
Q

Where are the main controls for bleed air system located?

A

Overhead bleed panel

45
Q

When aircraft is supplied with air by external unit in ground what should you ensure?

A

At least one window of door is open to prevent accidental cabin pressurisation

M11 (41 decks)

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