OLA Hydraulics

Question 1

Which hydraulic systems have their own reservoir?

Answer 1

All three

Question 2

Which hydraulic systems have a fire shutoff valve?

Answer 2

Green and yellow

Question 3

Does hydraulic fluid transfer across systems?

Answer 3

No

Question 4

What is the normal hydraulic operating pressure?

Answer 4

3000psi

Question 5

What normally pressurises the blue system?

Answer 5

An electric pump

Question 6

What pressure does the blue system operate at when powered by the RAT?

Answer 6

2500psi

Question 7

How can you open the cargo doors on the ground when the aircraft is not powered?

Answer 7

The hand pump can be used to pressurise the yellow system and operate the cargo doors

Question 8

What functions of the yellow system are available if the yellow pump is activated by ground handling personnel for cargo door operation?

Answer 8

All yellow system functions are inhibited except for alternate braking, engine 2 reverse and cargo door operation

Question 9

What pressure does the yellow system operate at if driven by the ENG2 pump? How about if driven by the electric pump?

Answer 9

3000psi in both cases

Question 10

Why might the engine 1 pump fault light not go on on the ground, even when the engine is not on and therefore not producing pressure?

Answer 10

The fault light for pump low pressure is inhibited on the ground to prevent nuisance warnings

Question 11

When does the blue hydraulic electric pump begin to operate?

Answer 11

On the ground with one engine running and AC power available

Question 12

In flight, when will the blue electric pump operate?

Answer 12

With AC power available, if the engines are running, or shut down

Question 13

Is the yellow pump normally on or off?

Answer 13

Off

Question 14

How do you turn on the yellow pump?

Answer 14

Use the push button
When the cargo door lever is set to open or close

Question 15

What shape denotes a main pump on the HYD SD page?

Answer 15

Square

Question 16

What are the indications on the ECAM HYD SD page when the yellow pump is switched on?

Answer 16

White empty triangle when off

Green filled triangle when on

(amber filled triangle when pump is on but system has low pressure)

Question 17

When does the PTU operate automatically?

Answer 17

When the pressure difference between the green and yellow system is greater than 500psi

Question 18

With hydraulic systems, when there is a fault, the FAULT light is displayed on the pb. Normally, when the pb is turned off, the fault light disappears, except in which case?

Answer 18

Overheat. The fault light will remain on as long as the overheat condition exists

Question 19

What is the PTU logic during engine starts?

Answer 19

It is inhibited during first engine start.

It is automatically tested during second engine start.

It is inhibited when yellow electric pump is used for cargo door operation

Question 20

When does the RAT deploy automatically?

Answer 20

Loss of AC BUS 1 and 2, with airspeed greater than 100kts

Question 21

When can the RAT be stowed?

Answer 21

On the ground only

Question 22

How are the hydraulic reservoirs pressurised? Why are they pressurised?

Answer 22

Pneumatic air. This is done to prevent cavitation

Question 23

Which systems have fire shutoff valves?

Answer 23

Green and yellow

Question 24

What do the fire shutoff valves do?

Answer 24

Cut hydraulic fluid to the respective engine driven pump

Question 25

How are the fire shutoff valves closed?

Answer 25

Pushing the engine fire push button switch

Question 26

If a fire shutoff valve is closed, is that hydraulic system lost?

Answer 26

No - it can still be powered with the PTU

Question 27

What is the purpose of the hydraulic accumulator?

Answer 27

It assists in maintaining a constant pressure during normal operation

Question 28

Which hydraulic systems have accumulators?

Answer 28

All three (one for each system)

Question 29

Which hydraulic systems have priority valves?

Answer 29

All three

Question 30

What do the priority valves do?

Answer 30

If system pressure is low, the priority valve will cut off hydraulic pressure to the high-load users, such as slats, flaps and gear, in order to maintain the operation of essential flight controls

Question 31

In the green and yellow system, what is the flow of the hydraulic fluid?

Answer 31

The fluid flows from the reservoirs to the engine pumps through the fire shutoff valves. From the engine pumps, hydraulic fluid flows to the hydraulically operated system components, and then back to the reservoirs via the return manifold

Question 32

In the blue system, what is the flow of the hydraulic fluid?

Answer 32

Hydraulic fluid flows from the reservoir to the electric pump (or RAT if extended), then flows to the hydraulically operated system components and back to the reservoir

Question 33

At what pressure does the HYD G ENG PUMP LO PR trigger?

Answer 33

1450psi

Question 34

In a G+Y HYD failure, what is available for stopping?

Answer 34

Accumulator pressure only