Hydraulic

Question 1

Hydraulic system provide power for:

Answer 1

• flight controls
• spoilers
• landing gear
• nose wheel steering
• wheel brakes
• thrust reversers

Question 2

Normal hydraulic pressure

Answer 2

3,000 psig

Question 3

Hydraulic System 1 is comprised of:

Answer 3

• one reservoir
• one engine driven pump (EDP 1)
• one electric pump
• one accumulator

Question 4

Hyd system 1 powers

Answer 4

1. elevator (left hand outboard)
2. rudder (upper)
3. thrust reverser (engine 1)
4. multi function spoilers (l and r panels 3 and 4)
5. ground spoilers (l and r panel 2)
6. outboard brakes
7. emergency parking brake

Question 5

What does the hydraulic accumulator do?

Answer 5

helps maintain constant pressure by covering transient demands during normal operation and keeping residual pressure to avoid pump cavitation

Question 6

Hydraulic System 2 is comprised of:

Answer 6

• one reservoir
• one engine driven pump (EDP 2)
• one electric pump
• one accumulator
• PTU

Question 7

Hyd system 2 powers

Answer 7

1. elevator (left and right inboard)
2. ailerons (right and left inboard)
3. thrust reverser (engine 2)
4. multi function spoilers (l and r panel 5)
5. ground spoilers (l and r panel 1)
6. inboard brakes
7. nose wheel steering
8. landing gear
9. emergency parking brake

Question 8

How are the engine driven pumps powered

Answer 8

engine accessory gear box

Question 9

In flight the electric pump 1 and 2 activates automatically when:

Answer 9

• EDP or engine fail or
• flaps selected greater than 0
• during landing for 60 seconds to avoid abrupt hyd pressure variations in the event of engine failure

Question 10

On ground the electric pump 1 and 2 activates automatically when:

Answer 10

• flaps greater than 0 and
• thrust levers set to takeoff thrust or
• groundspeed greater than 50 its
• during takeoff w/ thrust levers at TOGA for 60 seconds to avoid abrupt pressure variations in the event of engine failure

Question 11

On the ground electric pump 2 automatically activates when

Answer 11

• engine 1 running and parking brake released
• engine 1 running and flaps greater than 0
• during engine 1 start if parking brake has been applied at least 6 mins before

Question 12

What is the purpose of the PTU

Answer 12

assists landing gear retraction or extension should a right engine or EDP pump fail

Question 13

the PTU is powered by

Answer 13

a hydraulic motor in hydraulic system 1

Question 14

the PTU will be automatically started when:

Answer 14

• flaps are not set to 0 or landing gear not up
• EDP 1 not failed
• hydraulic reservoir 2 quantity above 12%
  (will not activate on ground)

Question 15

Hydraulic system 3 is comprised of

Answer 15

• one reservoir
• two electric pumps
• one accumulator

Question 16

Hydraulic system 3 powers

Answer 16

• elevator (right hand outboard)
• rudder (lower)
• ailerons (l and r outboard)

Question 17

When does hyd pump 3B automatically activate

Answer 17

electric pump 3A failure and position in AUTO

Question 18

Describe the two emergency valve in hyd system 3

Answer 18

pump unloader valve - The pump unloader valve is used to reduce the discharge pressure of electric hydraulic pump A during its start-up. This will reduce the pump torque and therefore reduce the electrical power required to start the pump.
flow limiter valve - The flow limiter valve is used to reduce the amount of flow provided by electric hydraulic pump A. This will limit the electrical power that the pump can draw and prevent the electric hydraulic pump from stalling the RAT.

Question 19

HYD 1 or 2 or 3 OVERHEAT warning

Answer 19

associated hydraulic system temp exceeded the caution operational range

Question 20

HYD 1 or 2 or 3 HI TEMP caution

Answer 20

associated hydraulic system temp exceeded normal range

Question 21

HYD 1 or 2 or 3 LO PRESS caution

Answer 21

associated hydraulic system pressure is low

Question 22

HYD PTU FAIL caution

Answer 22

PTU is not supplying hydraulic power to hydraulic system 2, or PTU automatic operation is compromised

Question 23

HYD 1 or 2 EDP NOT D-PRESS caution

Answer 23

depressurization of the associated engine driven pump has failed

Question 24

HYD 3 VLV FAIL advisory

Answer 24

one or both hydraulic system 3 valves, used during an electrical emergency, have failed

Question 25

HYD 1 or 2 EDP FAIL advisory

Answer 25

associated engine driven pump is not providing hydraulic power to the system

Question 26

HYD 1 or 2 ELEC PUMP FAIL advisory

Answer 26

associated electric pump is not providing hydraulic power to the system

Question 27

HYD 3 ELEC PUMP A or B FAIL advisory

Answer 27

associated system 3 electric pump is not providing hydraulic power to the system

Question 28

HYD 1 or 2 or 3 LO QTY advisory

Answer 28

fluid level in the associated reservoir is low

Question 29

HYD 1 or 2 SOV FAIL advisory

Answer 29

associated SOV is not in commanded position

Question 30

HYD 3 PUMP A NOT ON advisory

Answer 30

ACMP 3A is not set to ON position

Question 31

HYD PTU NOT AUTO advisory

Answer 31

PTU is not in auto position

Question 32

HYD PUMP NOT AUTO advisory

Answer 32

SYS 1 or 2 or 3 electric pump is not in auto position

Question 33

HYD TEMP SENS FAIL advisory

Answer 33

at least one of the hydraulic temperature sensors are failed and the system is unable to monitor the temperature of that system

Question 34

HYD 1 or 2 SOV CLOSED STATUS

Answer 34

associated SOV closed