ATA 29 - HYDRAULICS

Question 1

The Hydraulic system is how many systems?

Answer 1

Two. The Resovior/Valve block, and the Pumps

Question 2

How many releif valves per system?

Answer 2

Two. One High Px, One Low Px.

Question 3

What Px is the High Px releif valve?

Answer 3

122 bar

Question 4

What Px is the Low Px releif valve?

Answer 4

7.5bar

Question 5

How many filters are in the Hydraulic system?

Answer 5

Two - One per valve block.

Question 6

What type of pump are the hydraulic pumps?

Answer 6

Pistion type pumps.

Question 7

What is the operating Px of the Hydraulic system?

Answer 7

103 bar

Question 8

What is the Hyd Module frame made of?

Answer 8

Milled Aluminium

Question 9

What changes with Hydraulic demand, Px or flow?

Answer 9

Flow. The Px always stays the same.

Question 10

How does the flow increase in the Hyd system?

Answer 10

by the angle of the backplate in the pump

Question 11

How many main actuators are there?

Answer 11

3 double actuators.

Question 12

How many Hyd pumps are in the system?

Answer 12

One per system.

Question 13

What is the use of the actuators?

Answer 13

To turn hyraulic Px into mechanical Px.

Question 14

Which system has the TR shut-off valve?

Answer 14

System 1.

Question 15

when does the TR shut-off vlave close?

Answer 15

when there is less than 0.19litres of flud left in the resovoir.

Question 16

What is the pre-load (resovoir) Px?

Answer 16

1.4-.1.75 bar

Question 17

How many lines are connected to each pump?

Answer 17

Four. Suction Line (S) from the resovoir, Output Line (P) to the system, Case Drain (Sc) providing a minimum flow around the pump to provide cooling and lubrication, and the Seal Drain (Sd) connected to the seal drain ofr the pump seal.

Question 18

Where is the seal drain connected to?

Answer 18

the overboard drain.

Question 19

What is the capacity of the Hyd system?

Answer 19

1.2 litres

Question 20

What are the Hyd pumps driven from?

Answer 20

The ACC GBOX

Question 21

How is system flow increased?

Answer 21

By increasing the pump stroke.

Question 22

What is the sight glass for on the Resvoir?

Answer 22

For checking to see if there is air in ther hyd system

Question 23

Where is non-return valve located?

Answer 23

in the resvoir block after the line from the pump, and before the filter.

Question 24

How is the fluid level checked?

Answer 24

By the level indiactor located on the front of the resovoir.

Question 25

What is the resovoir capacity?

Answer 25

0.8litres

Question 26

What Px does the LOW HYD Px caution illuminate?

Answer 26

69 BAR

Question 27

When does the LOW HYD Px caution extinguish?

Answer 27

83 BAR

Question 28

The three support levers belong to what section of the system?

Answer 28

the NON-BOOSTED control section

Question 29

Which Hyd system has an additional Px switch?

Answer 29

System 1 - for the TR Actuator.

Question 30

When will the TR SHUT OFF caution illuminate?

Answer 30

When the level drops below 0.19 litres in the system 1 resovoir and the TR shut-off valve closes.

Question 31

When can the HYD TEST be c/o?

Answer 31

On the ground only.

Question 32

What happens when the HYD SYS 1 TEST is activated?

Answer 32

The solonoid valve of System 2 is energised and closed, giving a LOW PRESS HYD 2 caution.

Question 33

Which modal has an Electric Hyd pump?

Answer 33

The D3.

Question 34

What is the purpose of the E-HYD pump?

Answer 34

for ground test of the flight controls only.

Question 35

What Px does the E-HYD pump provide?

Answer 35

80-100 bar

Question 36

Which system does the E-HYD pump run off?

Answer 36

System 1.