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M11 new josh > 11.16 pneumatic and vacuum > Flashcards

11.16 pneumatic and vacuum Flashcards

1
Q

what does the pneumatic system do

A

transfers energy through manipulation of air pressure

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2
Q

what are the sources for pneumatic systems

A

engines, APU, ground air power units

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3
Q

what 4 categories does the pneumatic/vacuum system fall into

A

vacuum, low pressure, medium pressure, high pressure

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4
Q

what psi does the low pressure system run at

A

1-10 psi

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5
Q

what psi does the medium pressure system run at

A

50-150 psi

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6
Q

what psi does the high pressure system run at

A

1000-1300 psi

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7
Q

what is the pneumatic system primarily supplied by

A

engines

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8
Q

what is the duct called that connects the right and left systems

A

crossover duct, cross bleed manifold

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9
Q

what must be ensured before working on any pneumatic system

A

its depressurised

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10
Q

where can bleed air be taken from in the engine

A

LP bleed port, IP bleed port, HP bleed port

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11
Q

how is it chosen what bleed port the pressurised air is taken from on the engine

A

engine speed

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12
Q

when are the LP and IP bleed ports used

A

take off, climb and cruise

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13
Q

when is the HP bleed port used

A

when the IP or LP is inadequate

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14
Q

what are the 2 disadvantages of using bleed air from the engine compressors

A

air contamination risk, reduced engine performance

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15
Q

what 2 different ways does the APU supply pneumatic air

A

directly bleeding from compressor, load compressor driven by turbine

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16
Q

what are the 2 actuated devices on the APU

A

inlet guide vanes, surge control valve

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17
Q

when is bleed air available from the APU

A

running above 95%

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18
Q

ground sources for bleed air can either be

A

fixed or portable cart-type

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19
Q

what 3 groups can compressors be split into

A

positive displacement, multi stage, centrifugal

20
Q

what can drive the centrifugal compressor

A

accessory gearbox, engine bleed air

21
Q

when is the centrifugal compressor drive ratio at maximum

A

operating at high altitude with low engine RPM

22
Q

in a pneumatic air high pressure storage bottle what is the psi range

A

1000-3000 psi

23
Q

what are air pressure pumps commonly known as

A

air compressors

24
Q

what does the air compressor do

A

absorbs atmosphere air, compresses it, sends it to systems

25
Q

what are the 2 main positive displacement, vane type vacuum pumps

A

wet type, dry type

26
Q

are dry pumps self lubricating

A

yes

27
Q

aircraft without the facility for an engine driven vacuum use what

A

venturi system

28
Q

what are common problems with venturi

A

ice formation, damage/deformation, blocked filter cartridge, leaking plumbing

29
Q

what is a PRV

A

pressure relief valve

30
Q

what is the purpose for pressure relief valves

A

prevent system damage

31
Q

what can restrictor valves do

A

increase or decrease airflow

32
Q

where is the moisture separator located in the pneumatic system

A

downstream of the compressor

33
Q

when the aircraft is supplied with air on ground what must happen in the cabin

A

a door or window must be opened

34
Q

what are pneumatic manifold ducts made from

A

strong, corrosion resistant, lightweight tubing

35
Q

what can a gold coating protect tubing from

A

hydrocarbon contamination

36
Q

what must the temp stay between in the pneumatic system

A

160-200 degrees celcius

37
Q

what do the manifold pressure sensors do

A

monitors air supply

38
Q

what is duct pressure controlled at (psi)

A

20 psi

39
Q

what is fan air used for

A

cooling

40
Q

what is the FAV

A

fan air valve

41
Q

if a leak occurs in an air duct what happens

A

overheat

42
Q

what is the pneumatic system controlled with

A

panel in cockpit or automatically

43
Q

where are most aircrafts pressure sensors mounted

A

left and right duct distribution systems

44
Q

starting the APU requires what

A

ground air unit or an engine running

45
Q

what is TAT

A

total air temperature

M11 new josh (23 decks)

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