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A320 > Pneumatics > Flashcards

Pneumatics Flashcards

1
Q

what systems use the HP pneumatics

A
  • air conditioning
  • engine starting
  • wing anti-ice
  • hydraulic and water reservoir pressurisation
    not included:
  • fwd/aft cargo heating
  • FTIS (Fuel Tank Inerting System)
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2
Q

what are the sources of HP air

A
  • eng bleed
  • APU bleed
  • external HP air
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3
Q

how is the bleed valve operated and controlled

A
  • pneumatically operated

- electrically controlled

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4
Q

what are the options for bleeding the air from the engine

A
  • Intermediate pressure stage of the HP compressor (via check valves); OR
  • High pressure stage of the HP compressor (via HP valve)
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5
Q

when does the HP valve open

A
  • low engine speed

- bleed pressure and or temperature insufficient

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6
Q

what pressure does IP and HP regulate to

A

36psi +/- 4psi

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7
Q

when does the HP valve automatically close (pneumatically and electrically)

A
  • pneumatically:
    1) low upstream pressure
    2) excessive upstream pressure
  • electrically:
    1) bleed valve is closed
    2) o/press upstream of HP valve, and;
    a) wing AI - off
    b) 2 packs - on
    c) alt > 15,000’
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8
Q

what kind of valve is the bleed valve

A
  • shutoff

- pressure regulating

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9
Q

what pressure does the bleed valve regulate to

A

45psi +/- 5psi

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10
Q

what pressures may the bleed valve fluctuate to and max peak to peak

A

38psi to 56psi (16psi peak to peak)

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11
Q

when is the bleed valve automatically closed pneumatically and electrically

A 
pneumatically:
- upstream psi < 8
- return flow
electrically:
- ENG BLEED Pb - OFF
- ENG FIRE Pb - pressed
- BMC detects:
a) overtemperature
b) overpressure
c) leak
d) open starter valve
e) APU bleed - ON
f) ENG SHUTDOWN (3332 onwards VNF)
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12
Q

if pressure regulation fails when does the overpressure valve automatically close

A

75psi

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13
Q

what is the exception to the ENG bleed valve closing if the APU bleed is ON

A

if the APU bleed is on and the XBLEED valve is SHUT, ENG 2 BLEED will remain OPEN

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14
Q

what is the purpose of the pre-cooler

A

regulated the ENG bleed air temperature

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15
Q

what type of exchange is the pre-cooler

A

air-to-air

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16
Q

what temperature does the pre-cooler try to regulate to

A

approximately 200 degrees

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17
Q

what controls the amount of cold air passing through the pre-cooler

A

the fan air valve which bleeds air from the FAN of the engine

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18
Q

what happens to the fan air valve in the absence of pressure

A

spring-loaded closed

19
Q

what type of valve is the APU bleed valve

A

shutoff

20
Q

what happens to the rest of the bleed system if the APU bleed sw is ON

A
  • both ENG BLEED valves close

- XBLEED OPENS

21
Q

when does the APU BLEED valve automatically close

A

EDES for all

  • APU leak
  • left wing leak
  • pylon 1 leak
22
Q

how is the XBLEED valve controlled

A

2 electric motors:
1st during automatic operations
2nd during manual operations

23
Q

when does the XBLEED valve automatically open and close

A
  • opens if APU BLEED - ON

- closes if leak detected (except during engine start)

24
Q

where are leak detection systems in place

A
  • APU
  • wing
  • pylon
25
Q

which leak detection systems use single and double loops

A
  • single:
    a) pylon
    b) APU
  • double:
    a) wing
26
Q

when does an alert occur for the double leak detection systems

A
  • when both detect a leak; OR

- when 1 loop detects a leak and the other loop is U/S

27
Q

what happens following a wing leak

A
  • associated ENG BLEED valve - closes
  • ENG BLEED FAULT lt - illuminates
  • XBLEED valve closes (EDES)
  • APU BLEED valve - closes if LHS affected (EDES)
28
Q

what happens following a pylon leak

A
  • associated ENG BLEED valve - closes
  • ENG BLEED FAULT lt - illuminates
  • XBLEED valve closes (EDES)
  • APU BLEED valve - closes if LHS affected (EDES)
29
Q

what happens following an APU leak

A
  • APU BLEED valve - closes (EDES)
  • APU BLEED Pb fault lt - illuminates
  • XBLEED valve - closes (EDES)
30
Q

what leak detection loops does BMC 1 receive

A
  • pylon 1
  • APU
  • loop A of both wing loops
31
Q

what leak detection loops does BMC 2 receive

A
  • pylon 2

- loop B of both wing loops

32
Q

if 1 of the BMCs fail what does the other BMC monitor and issue ECAMS for

A
  • overpressure
  • overtemperature
  • wing leak
33
Q

what is lost if 1 BMC fails

A
  • FAULT lt on OVHD PNL
  • associated BLEED valve does not close automatically
  • ENG BLEED LEAK warning for associated engine
  • APU BLEED LEAK warning if BMC 1 is failed
34
Q

with the ENG BLEED Pb sw in the on position, when will it open

A
  • upstream psi > 8
  • APU BLEED Pb - OFF or APU bleed valve closed
  • no onside wing/pylon leak and no overpressure/overtemperature
  • ENG FIRE Pb not pressed
  • ENG start valve closed
35
Q

when does the ENG BLEED Pb fault light illuminate

A
  • overpressure downstream of bleed valve
  • bleed air overheat
  • wing/pylon leak on related side
  • bleed valve not closed during eng start
  • bleed valve not closed with APU bleed ON
    extinguishes when ENG BLEED Pb is OFF and the fault has disappeared
36
Q

what are the indication on the BLEED SD page regarding the precooler

A
  • pre-cooler inlet pressure

- pre-cooler outlet temperature

37
Q

when does the precooler pressure indication turn amber

A
  • below 4psi

- above 57 to 60

38
Q

when does the precooler temperature indication turn amber

A
  • overtemp:
    a) 290 for more than 5s
    b) 270 for more than 15s
    c) 257 for more than 55s
  • low temperature: (only in flight)
    below 150 degrees with wing AI ON and PRV OPEN
39
Q

when does the APU BLEED LEAK ECAM appear

A

APU bleed leak detection loop detects a temperature above 124

40
Q

when does the AIR ENG 1(2) BLEED FAULT ECAM appear

A

engine is running and:

1) ENG bleed air press> 57-60psi, OR
2) engine bleed air temperature>
a) 290 for 5s
b) 270 for 15s
c) 257 for 55s

41
Q

when does the AIR ENG 1(2) BLEED LO TEMP ECAM appear

A

bleed air temperature < 150 degrees in flight with wing A-ICE Pb - ON

42
Q

when does the AIR ENG 1(@) BLEED HI TEMP ECAM appear

A

pre-cooler outlet temper > 240

43
Q

when does the AIR ENG 1(2) BLEED LEAK ECAM appear

A

pylon bleed leak detection loop detects a temperature > 204 and the engine is running

44
Q

when does the AIR L(R) WING LEAK ECAM appear

A

when both wing bleed leak detection loops detect a temperature above 124

A320 (5 decks)

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