Week 2 Day 4

Question 1

What does the air non return check valve do?

Answer 1

Stops 8th stage air getting into 5th stage

Question 2

What stage air do we use for cowl anti ice?

Answer 2

5th stage

Question 3

What stage air do we use for wing anti ice?

Answer 3

5th and 8th stage air

Question 4

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

Answer 4

Aspiration - creating an airflow over them for more accurate temperature

Question 5

What does the bleed air isolation valve do?

Answer 5

Isolated left and right sides of bleed air manifold

Question 6

When does the TAT PRV valve energise open?

Answer 6

When on ground

Question 7

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

Answer 7

• TAT aspiration

- to keep the PRV open on ground

Question 8

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

Answer 8

On ground only

Question 9

Where are the bleed air controllers located?

Answer 9

Baggage bay forward bulkhead (RH)

Question 10

What controls torque motor valves in the bleed air system?

Answer 10

The bleed air controller

Question 11

What does the 8th stage valve ensure?

Answer 11

Minimum manifold pressures

Question 12

What does the PRSOV do?

Answer 12

Maintains a maximum manifold pressure of 40psi

Question 13

Where are the precooked temp sensors mounted?

Answer 13

Handed bleed air ducts (engine side)

Question 14

What does the fan air valve do?

Answer 14

Provides cooling air to the precooler

Question 15

What regulates the fan air valve?

Answer 15

Precooler inlet and outlet temp sensors speaking to the BAC

Question 16

What type of valve is the fan air valve?

Answer 16

• spring loaded open

- torque motor controlled

Question 17

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

Answer 17

Right

Question 18

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

Answer 18

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

Question 19

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

Answer 19

• backlash measurement fixture

- force gauge

Question 20

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

Answer 20

30 seconds

Question 21

What valves prevent fuel going directly into hopper during refuel?

Answer 21

• non return

- defuelling check valves

Question 22

What controls the APU load control valve?

Answer 22

The APU ECU

Question 23

What pressure are the water tanks pressurised to?

Answer 23

42-48psi

Question 24

What is a bleed air system fail message indicative of?

Answer 24

Failed BAC

Question 25

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

Answer 25

- inlet - 765 degrees | - outlet - 550 degrees

Question 26

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

Answer 26

- >75psi for high pressure | - <5psi for low pressure

Question 27

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

Answer 27

5th

Question 28

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

Answer 28

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

Question 29

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

Answer 29

- compressor outlet temp sensor above 450 degrees | - pack outlet sensor at 160 degrees

Question 30

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

Answer 30

- left - cabin | - right - cockpit

Question 31

When do you get an ACS maintenance required CAS message?

Answer 31

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

Question 32

When does the turbine bypass valve open?

Answer 32

Above 35000ft

Question 33

What is the bootstrap principle?

Answer 33

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

Question 34

What valves regulate bleed air supply into the packs?

Answer 34

Pack inlet valves control by ACC

Question 35

Are pack inlet valves spring loaded open or closed?

Answer 35

Open

Question 36

How often do ozone converters need changing?

Answer 36

10000 hours

Question 37

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

Answer 37

0.1PPM

Question 38

What does the ACM plenum do?

Answer 38

- provides drainage of water from heat exchanger | - exhausts ram air from what exchangers overboard

Question 39

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

Answer 39

- primary heat exchanger - air cycle machine compressor - secondary heat exchanger - reheated condenser - air cycle machine turbine

Question 40

What does the ACM compressor bypass check valve do?

Answer 40

- 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

Question 41

What does the turbine inlet control valve do?

Answer 41

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