Revision

Question 1

For the PTU to run automatically, which solenoid valves must be in which position?

Answer 1

Green and yellow must be de-energized open

Question 2

How is PTU operation inhibited (aside from isolation coupling)?

Answer 2

Energizing the yellow and green solenoid valves

Question 3

What computers do the pressure switches in the green HP manifold report to?

Answer 3

Various EFCS computers and the BSCU

Question 4

How are the hydraulic fire shutoff valves operated?

Answer 4

The engine fire pushbutton

Question 5

What is the purpose of the priority valve in a hydraulic manifold?

Answer 5

Cuts off hydraulic power to heavy users of hydraulics to maintain power for essential systems

Question 6

Which filter in the hydraulic systems is the only one with a bypass?

Answer 6

Return LP filter

Question 7

What does a phase imbalance fault on an electric hydraulic pump cause?

Answer 7

The pump to shut off automatically

Question 8

When does the blue pump start and stop automatically?

Answer 8

Starts once one engine running, stops after last engine shutdown

Question 9

What happens when the leak measurement valve button is pushed?

Answer 9

Button shows OFF, and the leak measurement valve cuts off supply to the flight controls

Question 10

Where is the hydraulic temperature transmitter located?

Answer 10

Return manifold

Question 11

Where is the aft hydraulic collector tank?

Answer 11

The MLG bay

Question 12

How is the PTU isolated for maintenance?

Answer 12

The PTU isolation coupling on the yellow PTU manifold

Question 13

Where is the RAT safety tool installed?

Answer 13

Blue hydraulic compartment

Question 14

When is inflight braking applied?

Answer 14

Landing gear selected to UP

Question 15

How is the landing gear sensed to be off ground?

Answer 15

Three shock absorbers must be detected extended

Question 16

What is the last part of the landing gear retraction sequence?

Answer 16

‘Gear up’ signal cancelled while maintaining ‘door closed’

Question 17

When does the LGCIU switch over?

Answer 17

When gear selected UP

Question 18

What is the landing gear wheel axle part of?

Answer 18

The sliding tube

Question 19

What valves operate when gravity extension is activated?

Answer 19

2 Vent valves and cut out valve

Question 20

When gear is down and locked, where is hydraulic pressure maintained?

Answer 20

On the lock stay actuators and ‘door close’ lines

Question 21

What enables the landing gear doors to be closed on ground?

Answer 21

Green hydraulic pressure

Question 22

What prevents the L/G door ground opening handle from being moved to the closed position?

Answer 22

A plunger in the bypass valve, until hydraulic pressure is applied

Question 23

What sends signals to the landing gear indicator panel?

Answer 23

LGCIU 1 only

Question 24

In what braking modes is anti-skid available?

Answer 24

Normal braking
Alternate braking with anti-skid

Question 25

What has priority over all braking modes?

Answer 25

Park brake

Question 26

When using normal braking and the anti-skid is faulty, what is activated?

Answer 26

The ABCU for alternate braking

Question 27

A third set of potentiometers in the alternate brake pedal transmitter unit are supplied by what bus?

Answer 27

Hot battery bus

Question 28

How is artificial feel created for the brake pedals

Answer 28

Spring rods under the pedals

Question 29

What is the function of the hydraulic fuses

Answer 29

Stop flow in case of leakage

Question 30

What conditions are required for the NWS to be active?

Answer 30

Aircraft on ground, one engine running, nws/antiskid switch on, towing lever in normal position

Question 31

What happens if both NWS handles are operated at the same time?

Answer 31

Inputs are added algebraically

Question 32

If the NLG shock strut extension is more than 300mm, what can happen?

Answer 32

Towing can damage the internal centering cam

Question 33

What is the aileron droop function?

Answer 33

Deflects ailerons down when flaps extended

Question 34

What is the main purpose of the side stick?

Answer 34

Transmits signals to EFCS for manual flight

Question 35

In normal operations, how are the elevators or ailerons controlled by the actuators?

Answer 35

One is in active mode, one in damping mode

Question 36

Going across, what is the order of hydraulic systems for the spoilers?

Answer 36

G Y B Y G

Question 37

What spoilers are used for roll spoilers?

Answer 37

2-5

Question 38

What spoilers are used for ground spoilers?

Answer 38

All 1-5

Question 39

What spoilers are used for speedbrakes?

Answer 39

2 - 4

Question 40

If both servo controls on an aileron fail what happens to the other side?

Answer 40

Still operational

Question 41

If a spoiler servocontrol fails, what happens?

Answer 41

Affected spoiler retracts and same spoiler on other side retracts and is disabled

Question 42

What are the yaw damper servo actuators controlled by?

Answer 42

FAC

Question 43

What are the rudder pedals connected to the rudder hydraulic actuators with?

Answer 43

A differential unit

Question 44

What happens to the rudder pedals when AP is engaged?

Answer 44

A solenoid in the artificial feel unit energizes and increases the force on the pedals

Question 45

Where is rudder travel limitation calculated?

Answer 45

The FACs

Question 46

What system will make the rudder pedals move?

Answer 46

Rudder trim

Question 47

What happens with the rudder TLU if both FACS fail?

Answer 47

Will go into low speed mode when slats are extended

Question 48

Which actuator has two electric motors?

Answer 48

Rudder trim

Question 49

How is rudder travel limited?

Answer 49

In the TLU with adjustable stops

Question 50

What does ELAC2 normally control?

Answer 50

Elevators and THS

Question 51

Which input for pitch trim has priority?

Answer 51

Mechanical input wheel

Question 52

What hydraulic systems run the THS?

Answer 52

Green & yellow

Question 53

What is the THS moved by?

Answer 53

A screw jack with 2 hydraulic motors and 3 electric motors

Question 54

What channels are in each SFCC

Answer 54

One slat channel & one flap channel

Question 55

What is the purpose of the enable solenoid in the flap/slat pcu?

Answer 55

Supplies hydraulic pressure to pressure-off brake

Question 56

How is slat assymmetry detected?

Answer 56

Comparison of APPU & FPPU

Question 57

What is required for a wing-tip brake to operate, SFCC-wise?

Answer 57

Both SFCC’s to agree on a discrepancy or, one inop and sends an arm signal, and one detects a descrepancy

Question 58

Where are the asymmetry position pick-off units?

Answer 58

Outer end of slat/flap drives?

Question 59

How are wing tip brakes reset?

Answer 59

On ground, engines shut down, throught MCDU

Question 60

How are the flap disconnect sensors monitored?

Answer 60

By the LGCIU, data sent to SFCCs

Question 61

What is the function of the slat/flap command unit?

Answer 61

Convert flap lever inputs into electrical signal