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A320 Knowledge > Pneumatic System > Flashcards

Pneumatic System Flashcards

1
Q

The pneumatic system supplies high pressure bleed air for……

A
  • Air conditioning
  • Engine starting
  • Wing Anti-icing
  • Water pressurisation
  • Hydraulic reservoir pressurisation
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2
Q

High Pressure Air has 3 sources:

A
  • Engine Bleed
  • APU load compressor
  • HP Ground connection
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3
Q

What components monitor and control the operation of the pneumatic system?

A

2 Bleed Monitoring Computers (BMC1 & BMC2)
The overhead control panel
The ECAM

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4
Q

How many BMC’s operate at the same time?

A

2

Each BMC controls and monitors its’ onside engine bleed air system

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5
Q

Are the BMC’s connected to each other?

A

Yes

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6
Q

What information does each BMC receive?

A

Bleed Pressure
Bleed temperature
Valve position

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7
Q

Where is air normally bled from for Bleed air supply?

A

Intermediate stage (IP) of the engines HP compressor

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8
Q

When would the bleed air come from the HP stage?

A

At low engine speed, when the pressure and temperature of the IP air are too low.

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9
Q

When bleed air is coming from the HP stage, what pressure is it maintained at?

A

36 +-4 psi

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10
Q

When does the HP valve close automatically:

Pneumatically?

A
  • Low upstream pressure

- Excessive upstream pressure

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11
Q

When does the HP valve close automatically:

Electrically?

A

-Bleed valve closed by BLEED pb

-Overpressure upstream of the HP valve with:
Wing Anti-ice OFF
2 Packs ON
Aircraft Altitude above 15000ft

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12
Q

What is the delivery pressure of the Bleed Vlave?

A

45 +-5 psi

fluctuating between 38-56 psi (max peak to peak 16 psi) at high engine power up to FL100

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13
Q

The bleed valve is closed pneumatically?

A
  • If upstream pressure <8 psi

- If there’s return flow

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14
Q

The bleed valve is closed electrically?

A 
BLEED pb OFF
ENG FIRE pb pushed
BMC: 
     Overtemp
     Overpressure
     Leak
     Open starter valve
     APU bleed ON
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15
Q

If pressure regulation of the Bleed valve fails at what pressure does the overpressure valve close?

A

> 75 psi

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16
Q

If APU bleed is ON and the crossbleed valve is SHUT, will Engine 2 bleed valve remain open?

A

Yes

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17
Q

What regulates the temperature of the Bleed air?

A

The pre-cooler

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18
Q

Where does the pre-cooler source its cooling air from for the air-to-air heat exchanger?

A

Engine fan via the fan air valve.

A spring keeps the fan air valve closed in the absence of pressure

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19
Q

What temperature does the pre-cooler regulate the bleed air to?

A

200 degC

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20
Q

When will the APU supply bleed air to the pneumatic system?

A

APU BLEED pb ON, and

APU speed >95%

21
Q

When APU bleed is ON, what is the position of the Engine Bleed and Crossbleed valves?

A

Crossbleed valve is OPEN

Engine Bleed valves are CLOSED, automatically

22
Q

When will the APU BLEED valve close automatically?

A

In the case of:
APU leak
Left wing leak
Pylon 1 leak

(except during engine start)

23
Q

In automatic mode, when will the cross bleed valve open?

A

When the system uses APU bleed air

24
Q

In automatic mode, when will the cross bleed valve close?

A

If the system detects an air leak (except during engine start)

25
Q

Leak detection loops detect any overheating near the hot air ducts in the ……?

A

Fuselage (APU signal)
Pylons
Wings

26
Q

Are single or double loops used for leak detection?

A

Pylon and APU -single

Wing -double

27
Q

Are two wing loops required for leak detection?

A

No, a leak can also be detected if one loop detects a leak and the other is inoperative.

28
Q

A Wing or Pylon leak signal causes…..?

A
  • BLEED valve on related side to close
  • Assoc. FAULT light
  • X-Bleed valve to close (except during engine start)

-If APU Bleed valve is open and leak concerns Pylon 1, APU BLEED to close (except during engine start)

29
Q

An APU leak signal causes….?

A
  • APU BLEED valve to close (except during engine start)
  • FAULT light in APU BLEED pb
  • X-Bleed valve to close (except during engine start)
30
Q

If one BMC fails, which ECAMs does the adjacent BMC take over the monitoring of?

A
  • Over pressure
  • Over temperature
  • Wing Leak
31
Q

If One BMC fails is the associated FAULT light in the BLEED pb available?

A

No, the FAULT light will NOT illuminate if theres a problem

32
Q

Which ECAM is lost if a BMC fails?

A

ENG BLEED LEAK (pylon) for the associated engine

33
Q

Which additional ECAM is lost if BMC 1 fails?

A

APU BLEED LEAK

34
Q

Will the cross bleed valve close automatically if a BMC has failed?

A

No

35
Q

Engine BLEED pb ON:

Bleed valve opens if….?

A 
Upstream pressure >8 psi
APU BLEED pb OFF or APU bleed valve closed
No onside wing or pylon leak 
No overpressure / overtemperature
ENG FIRE has not been pushed
Engine start valve closed
36
Q

ENG BLEED FAULT light comes on amber and ECAM caution appears if:

A
  • Overpressure downstream of bleed valve
  • Bleed air overheat
  • Wing or pylon leak on related side
  • Bleed valve not closed during engine start
  • Bleed valve not closed with APU bleed ON
37
Q

Which valves close when the ENG BLEED pb is switched OFF?

A

Bleed Valve and HP valve close

38
Q

APU BLEED pb ON.

Valve opens if…?

A
  • APU N >95%
  • No leak in APU
  • No leak in left side bleed

(if there is a leak in right side, x-bleed valve closes)

39
Q

When will the APU BLEED amber FAULT light illuminate?

A

When the system detects an APU leak

40
Q

When does the normally green precooler inlet pressure become amber?

A

<4 psi, or

If overpressure detected by BMC (>57-60 psi)

41
Q

When does the normally green precooler outlet temperature become amber?

A

If BMC detects an overheat or low temperature:

42
Q

What are the precooler overheat temperature limitations?

A

290°C for >5sec
270°C for >15sec
257°C for >55sec

43
Q

When is precooler low temperature detected and at what temperature?

A

In flight only,

temp <150°C, with
Wing Anti-ice ON, and
PRV in open position

NB. When engines are at idle and depending on ambient temperature, the precooler outlet temperature may be below 150°C (displayed amber)

44
Q

What does the GND HP connection indication on the system page indicate?

A

It is possible to connect to the HP ground air supply.

It appears on the ground only.

45
Q

What would cause the Anti-ice triangle on the Bleed SD to turn amber?

A
  • Valve is open and air pressure low or high

- Valve is open on the ground for >10sec

46
Q

What does the engine identification number mean when its amber?

A

The engine N2 is below idle

47
Q

What does the APU Bleed valve and line green on SD page mean?

A

APU MASTER sw is ON

48
Q

APU indication on SD page -green line with amber crossline valve pic?

A

APU MASTER sw is ON
APU valve is fully closed
APU BLEED sw is ON for more than 10sec

49
Q

Is APU bleed permitted for Wing Anti-ice?

A

NO!

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