Hydraulic System

Question 1

When is ACMP 3A normally selected ON?

Answer 1

Captain Before Start flow

Question 2

When is ACMP 3A normally selected OFF?

Answer 2

Captain Parking flow

Question 3

Each hydraulic system has and EDP and ACMP (T/F).

Answer 3

False

Question 4

Can hydraulic fluid be transferred between the systems?

Answer 4

No

Question 5

Which hydraulic ACMP can be powered by the RAT?

Answer 5

3A

Question 6

Hydraulic system 3 provides which flight controls?

Answer 6

Elevator, Aileron, Rudder

Question 7

The EDPs normally deliver hydraulic fluid at ____PSI.

Answer 7

3000

Question 8

The AC powered pumps in hydraulic system 3 include:

Answer 8

3A and 3B

Question 9

How many hydraulic systems are on the plane?

Answer 9

3 independent systems

Question 10

What systems use hydraulic power (6)?

Answer 10

Flight controls, spoilers, landing gear, wheel brakes, thrust reversers, nosewheel steering

Question 11

How many hydraulic pumps are on the aircraft?

Answer 11

2 EDPs, 4 ACMP, 1 PTU

Question 12

How many electric pumps are used for systems 1 and 2?

Answer 12

1 per system

Question 13

How long after power up should you wait before any hydraulic pumps should be turned on and why?

Answer 13

3 minutes to allow the flight controls to accomplish their built in PBIT test

Question 14

What is the primary and back up source of hydraulic pressure for system 3?

Answer 14

Primary ACMP 3A

Backup ACMP 3B

Question 15

When will the HYD ACMP 1 automatically activate on the ground?

Answer 15

Flaps >0 and groundspeed >50 knots
OR
Flaps >0 and thrust levers set to T/O

Question 16

When will ACMP 2 automatically activate on the ground?

Answer 16

Flaps >0 and groundspeed >50 knots
OR
Flaps >0 and thrust levers set to T/O
OR
Engine 1 running with parking brake released
OR
Engine 1 start (once N2 reaches 40%) if parking brake has been applied within the last 6 minutes

Question 17

When does ACMP 2 automatically turn off on the ground?

Answer 17

When parking brake has been set for >6 minutes

Question 18

When will ACMP 1 and 2 automatically activate in flight?

Answer 18

EDP failure or flaps > 0

Question 19

Can we disable the EDP by pressing the SYS 1 or SYS 2 ENGINE PUMP SHUTOFF button in?

Answer 19

No

Question 20

If the SYS 1 or 2 ENG PUMP SHUTOFF button is pushed in, will the respective EDP keep running?

Answer 20

Yes

Question 21

What happens when pushing in the HYD SYS 1 or SYS 2 ENGINE PUMP SHUTOFF guarded buttons?

Answer 21

Closes the respective hydraulic shutoff valve, isolating the respective EDP from the hydraulic system

Question 22

What is the PTU?

Answer 22

Power Transfer Unit

Question 23

How does the PTU work?

Answer 23

Hydraulic pump in hydraulic system 2 driven by a hydraulic motor installed in hydraulic system 1

Question 24

Will the PTU operate if on the ground in AUTO?

Answer 24

No

Question 25

The PTU is used to assist in landing gear operation should the right engine (#2) or right EDP fail (T/F).

Answer 25

True

Question 26

What is the purpose of the PTU?

Answer 26

Assist in landing gear retraction or extension in the event of engine 2 or EDP 2 failure

Question 27

Does fluid transfer occur between hydraulic systems while using the PTU?

Answer 27

No

Question 28

The PTU uses hydraulic power from system 1 to provide pressure to system 2 to power normal operation of which system?

Answer 28

Landing gear

Question 29

What conditions must be met for the PTU to automatically activate during takeoff or landing?

Answer 29

a. Engine 2 or EDP 2 failure b. Flaps not set to 0, landing gear not up and locked c. EDP 1 not failed d. Hydraulic reservoir 2 > 12%

Question 30

Why is there a PTU when ACMP 2 acts as the backup for EDP 2?

Answer 30

PTU assists to retract the landing gear because ACMP 2 has lower flow rate than EDP 2

Question 31

What is the primary purpose of ACMP 3A?

Answer 31

Backup for the primary flight controls

Question 32

Why does hydraulic ACMP 3A have an ON position

Answer 32

ACMP is the primary pump for system 3 and has no automation

Question 33

Why does hydraulic ACMP 3B have an AUTO position?

Answer 33

ACMP 3B is back up for ACMP 3A and automatically activates if ACMP 3A fails when the selector knob is in AUTO

Question 34

What is the purpose of the hydraulic ACMP 1 and 2?

Answer 34

Used as back up for the respective EDP

Question 35

Why does the selector knob for hydraulic systems 1 and 2 ELEC PUMPs have an ON position?

Answer 35

To override the system and turn the respective pump on

Question 36

Which ACMPs are automatically switched on for takeoff and landing?

Answer 36

ACMP 1 and 2

Question 37

If both engines fail, what provides hydraulic pressure to the flight controls until the RAT comes on line?

Answer 37

Hydraulic 3 accumulator | After 8 seconds, the RAT will power ACMP 3A

Question 38

If both engines fail, what provides hydraulic pressure to the flight controls after the RAT comes on line?

Answer 38

3A ACMP

Question 39

What ACMP will function if the RAT is the only power source?

Answer 39

ACMP 3A

Question 40

Using RAT power, if ACMP 3A fails, will ACMP 3B operate?

Answer 40

No, ACMP 3B is not powered by the RAT

Question 41

What items are on HYD system 1?

Answer 41

``` Lefthand outboard elevator Upper rudder Lefthand thrust reverser Multifunction spoilers 3 and 4 Ground spoiler 2 Outboard brake ```

Question 42

What items are on HYD system 2 (6)?

Answer 42

``` Left and righthand inboard elevator Left and righthand inboard aileron Righthand thrust reverser Multifunction spoiler 5 Ground spoiler 1 Inboard brakes ```

Question 43

What items operate on HYD system 3?

Answer 43

Righthand outboard elevator Lower rudder Lefthand and righthand outboard aileron

Question 44

When must a hydraulic warm-up be accomplished?

Answer 44

First flight of day with temperatures -18° or less