Hydralic Panel

Question 1

What PSI difference is needed between the green and yellow system for the bi-directional power transfer unit (PTU) to automatically engage?

Answer 1

500 PSI.

Question 2

When is the PTU inhibited?

Answer 2

NWS disc on ECAM

First engine start

1 Master On + Parking Brake Set

Cargo door operations

Question 3

PTU FAULT light?
(3,4,5)

Answer 3

Green or Yellow:

-reservoir low pressure.
-reservoir low quantity.
-reservoir overheat.

FAULT remains if the overheat remains.

Question 4

ENG 1(2) PUMP pb FAULT?

(3,4,5)

Answer 4

Eng 1 (Green); Eng 2 (Yellow):

-reservoir low pressure.
-reservoir low quantity.
-reservoir overheat.

-low pump pressure

FAULT remains if the overheat remains.

Question 5

-BLUE ELEC PUMP (black wire guarded)
-Yellow ELEC PUMP

What is FAULT?

(3,4,5)

Answer 5

-reservoir low pressure.
-reservoir low quantity.
-reservoir overheat.

-low pump pressure.
-pump overheats.

FAULT remains if the overheat remains.

Question 6

When does the blue electric hydraulic pump automatically engage?

Answer 6

-On ground w/ one engine running
-In flight

Question 7

If the PTU is inhibited during the first engine start, when does it self test?

Answer 7

During the second engine start