CHAPTER 29

Question 1

What hydraulic systems are connected via the PTU?

Answer 1

The green and yellow systems

Question 2

In an emergency which hydraulic system is powered from the RAT?

Answer 2

The RAT is an auxiliary pressure supply for the blue system,

Question 3

Which hydraulic system is capable of powering the rudder?

Answer 3

All 3

Question 4

Which hydraulic system does the normal brakes operate with?

Answer 4

Green

Question 5

Which hydraulic system is powered from the No1 EDP?

Answer 5

Green

Question 6

Which hydraulic system do the cargo doors operate with?

Answer 6

Yellow

Question 7

When will the PTU automatically operate?

Answer 7

pressure difference of 500 psi between the green and yellow systems.

Question 8

When will the PTU operation is inhibited?

Answer 8

1, During cargo door operation
2, When the A/C is on ground, with one engine running and if the parking brake is set on or the nose wheel steering is disconnected for towing (example: First engine start up during push back).

Question 9

Which hydraulic systems have electric pumps?

Answer 9

Blue and yellow

Question 10

Where are the hydraulic check valves located on the aircraft?

Answer 10

The green and yellow check valves are installed between the floor beams above the hydraulic bay and the blue one is installed in the aft cargo compartment.

Question 11

Before hydraulic oil replenishment, what configuration must the aircraft be in?

Answer 11

Before starting with the filling procedure, all flight control surfaces must be in their neutral retracted position, thrust-reversers retracted and the cargo-doors must be in the closed position. Ensure that the hydraulic systems are completely depressurized.

Question 12

If the oil reservoirs quantity indication on the ECAM was U/S could the aircraft still be dispatched?

Answer 12

Yes but the fluid quantity has to be checked on the reservoir direct reading gage prior to each flight.
The LO LVL Warning has to be checked operative before the first flight.
The air pressure has to be checked on the reservoir direct reading gage prior to each flight.

Question 13

On second engine start why does the PTU operate momentarily?

Answer 13

At the second engine start, the inhibition is removed when the second engine master switch is set to ON then the PTU will operate momentarily for self test purpose.