Hydraulic System

Question 1

What controls each of the hydraulic sytems.

Answer 1

Each hydraulic system has one HMC (Hydraulic Monitor & Control) to provide monitoring and control.

Question 2

What differences exist between the Green and Yellow hydraulic generation systems?

Answer 2

The two systems are identical for generation.

Question 3

What is the purpose of the hyraulic FSOV?

How many are there?

Answer 3

The FSOV isolates the reservoir from the pump.

There are two per engine, one per hydraulic sytem.

Question 4

How many hydraulic reservoirs are there?

Answer 4

There are two reservoirs, one per system.

Question 5

When do the FSOVs close?

Answer 5

The FSOV closes when:

• The ENG FIRE p/b is pressed
• The ENG SUPPLY p/b is pressed

Question 6

If the FSOV is closed in flight, how is it reopened?

Answer 6

The FSOV requires maintenance action on the ground to be reopened.

Question 7

What is the consequence of losing one hydraulic pump on a system?

Answer 7

Landing gear retraction time is longer than normal.

Other sytems operate normally.

Question 8

How many electric hydraulic pumps are there?

Answer 8

There is one electric hydraulic pump per system.

Question 9

When can the electric pump be used?

Answer 9

One the ground only with the engines off.

The motor requires a fixed 400hz frequency and must be disconnected from the bus when engines operate due to the frequency wild output of the main engine generators.

Question 10

Which hydraulic system operates cargo doors?

Answer 10

The Yellow system operates cargo doors.

Question 11

What are the two main parts of the HMC?

Answer 11

The HMCs comprise of:

• HMCA (Hydraulic Monitoring and Control Application) for control and monitoring functions plus interfaces to most systems.
• HMCRF (Hydraulic Monitoring and Control Remote Functions) for conversion of analogue/discrete signals for sytem use.

Question 12

How many hydraulic oil/fuel heat exchangers are there?

Answer 12

Two per system, one each system per wing tank.

Question 13

Which system controls the inboard ailerons?

Answer 13

The Yellow system.

Question 14

Which system controls the outboard ailerons?

Answer 14

The Green or Yellow systems.

Question 15

Which system controls spoilers 1,2,5 and 7?

Answer 15

The Yellow system.

Question 16

Which system controls spoilers 3,4 and 6?

Answer 16

The Green system.

Question 17

Which system controls the rudder?

Answer 17

The Green AND the Yellow systems.

Question 18

Which system controls the elevators?

Answer 18

The Green OR the Yellow system.

Question 19

Which system controls the landing gear?

Answer 19

• Main gear = Green system
• Nose gear = Yellow System

Question 20

Which system controls the nose wheel steering?

Answer 20

Nose wheel steering = Yellow system

Question 21

Which system controls the braking?

Answer 21

Braking = Green AND Yellow systems

Question 22

What does this symbol mean on the HYD SD page?

Answer 22

The FSOV is open.

Question 23

What does this symbol mean on the HYD SD page?

Answer 23

The FSOV valve is closed.

Associated with one of the following ECAM alert:

• ENG 1(2) FIRE
• HYD G(Y) RSVR OVHT
• HYD ENG 1(2) G(Y) PMP FAULT

Question 24

What does this symbol mean on the HYD SD page?

Answer 24

The FSOV valve is set to close but remains abnormally open.

Question 25

What does this symbol mean on the HYD SD page?

Answer 25

The EDP is on and the pressure is normal.

Question 26

What does this symbol mean on the HYD SD page?

Answer 26

The EDP is automatically depressurized due to a fuel low level in a wing tank. The automatic depressurization can occur in the case of fuel low level in a wing fuel tank and if the temperature of one hydraulic RSVR is above 80 °C. In this case one EDP per hydraulic system (GREEN and YELLOW) is automatically depressurized to minimize heat injection into the hydraulic system. However before landing or in the case of high hydraulic consumers demand, the depressurized EDP is automatically running.

Question 27

What does this symbol mean on the HYD SD page?

Answer 27

The EDP is manually depressurized and ENG 1(2) PUMP pb-sw is OFF or is automatically depressurized due to high temperature. When an abnormal temperature is detected in one EDP, the ECAM alert HYD ENG 1(2) G(Y) PMP FAULT is triggered and the EDP is automatically depressurized until the end of the flight.

Question 28

What does this symbol mean on the HYD SD page?

Answer 28

Next The EDP is set to OFF but remains abnormally pressurized.

Question 29

What does this symbol mean on the HYD SD page?

Answer 29

The EDP is running, and a low hydraulic pressure is detected. Associated with the following ECAM alert: HYD ENG 1(2) G(Y) PMP PRESS LO

Question 30

What does this symbol mean on the HYD SD page?

Answer 30

The EDP is running, and a high hydraulic pressure is detected. Associated with the following ECAM alert: HYD ENG 1(2) G(Y) PMP FAULT

Question 31

What does this symbol mean on the HYD SD page?

Answer 31

The pump is manually disconnected from the engine accessory gearbox, via the mechanical declutch mechanism.

Question 32

What does this symbol mean on the HYD SD page?

Answer 32

The engine is running.

Question 33

What does this symbol mean on the HYD SD page?

Answer 33

The engine is not running.

Question 34

What does this symbol mean on the HYD SD page?

Answer 34

The elctric pump is failed and automatically set to off.

Question 35

What does this symbol mean on the HYD SD page?

Answer 35

The electric pump is failed and manually set to off.

Question 36

What does this symbol mean on the HYD SD page?

Answer 36

The elec pump is running with the p/b set to on.

Question 37

What does this symbol mean on the HYD SD page?

Answer 37

The elec pump is running in automatic mode.

Question 38

What does this symbol mean on the HYD SD page?

Answer 38

These are system pressure and label icons. One shows a normal system pressure (green) One shows abnormal system pressure (amber)