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650 > Week 2 Day 4 > Flashcards

Week 2 Day 4 Flashcards

1
Q

What does the air non return check valve do?

A

Stops 8th stage air getting into 5th stage

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2
Q

What stage air do we use for cowl anti ice?

A

5th stage

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3
Q

What stage air do we use for wing anti ice?

A

5th and 8th stage air

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4
Q

What do the TAT probes use bleed air for on ground?

A

Aspiration - creating an airflow over them for more accurate temperature

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5
Q

What does the bleed air isolation valve do?

A

Isolated left and right sides of bleed air manifold

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6
Q

When does the TAT PRV valve energise open?

A

When on ground

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7
Q

What does the TAT PRV valve provide air to the TAT and PRV for?

A
  • TAT aspiration

- to keep the PRV open on ground

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8
Q

When is the APU approved to supply bleed air to the system?

A

On ground only

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9
Q

Where are the bleed air controllers located?

A

Baggage bay forward bulkhead (RH)

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10
Q

What controls torque motor valves in the bleed air system?

A

The bleed air controller

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11
Q

What does the 8th stage valve ensure?

A

Minimum manifold pressures

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12
Q

What does the PRSOV do?

A

Maintains a maximum manifold pressure of 40psi

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13
Q

Where are the precooked temp sensors mounted?

A

Handed bleed air ducts (engine side)

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14
Q

What does the fan air valve do?

A

Provides cooling air to the precooler

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15
Q

What regulates the fan air valve?

A

Precooler inlet and outlet temp sensors speaking to the BAC

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16
Q

What type of valve is the fan air valve?

A
  • spring loaded open

- torque motor controlled

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17
Q

Which side of the bleed air manifold does external and APU air feed into?

A

Right

18
Q

Where are the manifold pressure transducers and what do they communicate with?

A

Either side of the isolation valve and communicate with the bleed air controllers

19
Q

What tools are needed to perform a flying control backlash test?

A
  • backlash measurement fixture

- force gauge

20
Q

How long until you see blue CAS message at end of stab/any flying control rig?

A

30 seconds

21
Q

What valves prevent fuel going directly into hopper during refuel?

A
  • non return

- defuelling check valves

22
Q

What controls the APU load control valve?

A

The APU ECU

23
Q

What pressure are the water tanks pressurised to?

A

42-48psi

24
Q

What is a bleed air system fail message indicative of?

A

Failed BAC

25
Q

What do precooler inlet and outlet temps have to be to generate BLEED AIR HOT CAS messages?

A
  • inlet - 765 degrees

- outlet - 550 degrees

26
Q

What do bleed air manifold pressures have to be for trigger bleed air pressure high and low CAS messages?

A
  • > 75psi for high pressure

- <5psi for low pressure

27
Q

During normal operation up to 51000ft, the aircraft only needs _th stage air

A

5th

28
Q

What air typical bleed air pressures on ground, in air with engines at idle and on single pack operation (pack switch must be deselected)

A
  • on ground - 14psi
  • in flight with throttles at idle - 24psi
  • single pack operation - 35psi
29
Q

What two conditions will create a COOLING TURBINE HOT CAS message?

A
  • compressor outlet temp sensor above 450 degrees

- pack outlet sensor at 160 degrees

30
Q

Which zones do the left and right air conditioning controllers control?

A
  • left - cabin

- right - cockpit

31
Q

When do you get an ACS maintenance required CAS message?

A

If turbine inlet temperature in 50 degrees or lower for >2 mins

32
Q

When does the turbine bypass valve open?

A

Above 35000ft

33
Q

What is the bootstrap principle?

A

Turbine extracts energy from air and uses it to drive the compressor

34
Q

What valves regulate bleed air supply into the packs?

A

Pack inlet valves control by ACC

35
Q

Are pack inlet valves spring loaded open or closed?

A

Open

36
Q

How often do ozone converters need changing?

A

10000 hours

37
Q

How many PPM of ozone is left after air has been through converters?

A

0.1PPM

38
Q

What does the ACM plenum do?

A
  • provides drainage of water from heat exchanger

- exhausts ram air from what exchangers overboard

39
Q

What is the basic route of air through the air con pack?

A
  • primary heat exchanger
  • air cycle machine compressor
  • secondary heat exchanger
  • reheated condenser
  • air cycle machine turbine
40
Q

What does the ACM compressor bypass check valve do?

A
  • During initial start up, let’s air bypass the compressor and prevents compressor driving turbine
  • also if the compressor seizes, allows air to continue into cabin
41
Q

What does the turbine inlet control valve do?

A
  • Directs flow from reheater to turbine to ensure ice crystals do not enter turbine
  • operates when reheater outlet air drops below 75 degrees

650 (9 decks)

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