Week 3

Question 1

What are the 3 main jobs of the hydraulic system?

Answer 1

• Generate pressure
• Store fluid
• Port fluid

Question 2

What component in the hydraulic reservoir provides fluid quantity indication?

Answer 2

RVDT

Question 3

What type of hydraulic tubing is used in FOD probe areas?

Answer 3

Stainless steel

Question 4

How many hydraulic pumps in total?

Answer 4

• 2 edp
• 1 ptu
• 1 aux

Question 5

How does the PTU work?

Answer 5

Right system pressure drives a motor, spinning a pump and pressuring left system

Question 6

If you lose the right hydraulic system, what happens to the PTU?

Answer 6

Unavailable

Question 7

With both engines running, can you manually select the PTU on?

Answer 7

Yes

Question 8

In the hydraulic pressure relief/unloading valve, what order do the valves work?

Answer 8

• pressure relief opens
• if PRV open for 10-30 seconds, pressure dependent, unloading valve latched by hydraulic pressure, closing PRV

Question 9

Do the PTU or AUX pump deal with the pressure relief and unloading valve?

Answer 9

No

Question 10

What causes the hydraulic unloading valve to close?

Answer 10

0 gallons per minute flow

Question 11

What can cause aux pump fail (amber) CAS?

Answer 11

• <850psi
• pressure indicated with pump off (failed check valve)

Question 12

Just landed, what holds NLG down?

Answer 12

• suitcase springs
• down lock actuator

Question 13

What brakes does the aux pump pressurise?

Answer 13

Inboard

Question 14

How many proximity sensors in the gear system?

Answer 14

30

Question 15

How many pros sensors in gear system deal with WOW?

Answer 15

6

Question 16

Where do landing gear proximity sensors send signals?

Answer 16

LGCU

Question 17

What temp do fusible plugs melt?

Answer 17

390 +- 10 Celsius

Question 18

If full anti skid fails, what brake protection do I get?

Answer 18

Locked wheel protection which uses fastest wheel as reference instead of irs speed

Question 19

When you step on brake pedals, what transmits pressure to BCU?

Answer 19

4 x LVDT’s

Question 20

What provides excitation for brake pressure transducers for normal operation?

Answer 20

Brake control unit

Question 21

Where are the dump valve reset switches?

Answer 21

Over head touch screen hyd/CPCS page

Question 22

If a pedal position transducer fails, what CAS message will you get?

Answer 22

Individual brake pedal fail CAS

Question 23

In the flight control system, what are flight control computers there to do?

Answer 23

• give movement commands based on AP and side stick input
• interpret feedback

Question 24

What prevents flap movement when hydraulics are removed?

Answer 24

No back brake

Question 25

What does aileron/spoiler mixing do?

Answer 25

Roll assist

Question 26

What flight control surfaces involved in aileron/spoiler mixing?

Answer 26

• mid board and outboard spoilers
• ailerons

Question 27

What 3 BFCU statuses are there?

Answer 27

• disarmed
• armed
• engaged

Question 28

How many air data systems needed for flight?

Answer 28

2

Question 29

What components report flap position to the FECU?

Answer 29

Dual channel Flap resolvers

Question 30

Where do you go to enable flight control test?

Answer 30

TSC #5

Question 31

If your flight control is operating in EB mode, what has happened?

Answer 31

Lost both hydraulic systems

Question 32

What energises the EB manifold pump for EB use?

Answer 32

EBMCE

Question 33

Where are the PTU and Aux pumps?

Answer 33

Left system

Question 34

If only 2 operational IRS’, what cyan CAS message do you get?

Answer 34

FCS limited dispatch

Question 35

If you have 4000 lbs of fuel in both tanks, and left fuel level low CAS message shows, what might be the problem?

Answer 35

Issue with left ejector pumo

Question 36

What kind of malfunction would close the APU shut off valve but not shut off the master?

Answer 36

Fire

Question 37

Refuelling aircraft and refuelling shut off valve fails to close. What would save my fuel tank?

Answer 37

Stringer positive Px relief valve