Hydraulics

Question 1

Which components can pressurise the

GREEN System?

Answer 1

EDP1

&

PTU

Question 2

Which Components can

pressurise the

BLUE System?

Answer 2

Blue Electric Pump

&

RAT

Question 3

Which components can

pressurise the

YELLOW System?

Answer 3

EDP2

PTU

&

Yellow Electric Pump

Question 4

Which components can the

Hand Pump

pressurise?

Answer 4

Cargo Door

actuators only.

Question 5

When will the

PTU Operate?

Answer 5

When the difference between the

GREEN & YELLOW

systems exceeds

500 psi.

Question 6

When is the

PTU inhibited?

Answer 6

• Aircraft is on GROUND, and
• Either: Park Brake is set,
• or NWS is in the towing position, and
• One Eng Master SW is ON, the other OFF.
• Also, it will not run within 40 secs of Cargo Door operation.

Question 7

Does the RAT deploy
automatically

for any Hydraulic System

Failures?

Answer 7

No

Question 8

What do the priority valves do?

Answer 8

Cut off hydraulic power to heavy users.

This preserves hydraulic power for

flight controls.

Question 9

Hydraulic Reservoirs are pressurised.

Why?

Answer 9

This prevents cavitation at the

pumps.

Particularly at altitude.

Question 10

When does the BLUE

electric pump

usually operate?

Answer 10

After First Engine Start

or

In flight with AC power available.

Question 11

When does the YELLOW Electric Pump

normally operate?

Answer 11

• Switch in NORMAL Position - For Cargo Door Operation only.
• Switch in ON Position - It runs if AC Power is available.

Question 12

What 4 faults cause

EDP1 or EDP2 FAULT lights

to illuminate?

Answer 12

• Reservoir Low Level
• Reservoir Overheat
• Reservoir Low Air Pressure
• Low Pump Output Pressure

Question 13

If a FAULT light illuminates in a Pump

or the PTU pb, the PUMP/PTU is switched off.

What is the difference in sysytem response for

an OVERHEAT (fluid or pump)?

Answer 13

The FAULT light remains illuminated

until the system cools when

it will extinguish.

For other faults the FAULT light(s)

extinguish when the pb

is switched OFF.

Question 14

Before Engine Start,

which hydraulic systems

can be pressurised?

Answer 14

ALL OF THEM

• Switch the YELLOW Elec Pump ON, this will pressurise the YELLOW system and GREEN via the PTU.
• Select the BLUE override pb ON, this will pressurise the BLUE system.

Question 15

At what pressure is a

‘Low Pressure’

ECAM caution/Warning

triggered?

Answer 15

1,450 psi

Question 16

Is the loss of EDP1 the same as

the loss of

GREEN hydraulics?

Answer 16

• NO
• The PTU will maintain GREEN pressure if EDP1 fails.

Question 17

On Take-off a

Double Hydraulic Failure occurs at

90 knots.

Will this generate an ECAM warning?

Answer 17

No

This warning is inhibitted from

80 knots to 1,500 feet.

Question 18

Which Busbar powers the

BLUE electric pump?

Answer 18

AC1

Question 19

Which Busbar powers the

YELLOW electric pump?

Answer 19

AC2

or External power

(Yellow Pump is on the Ground/Flight Bus.)

Question 20

Aircraft is shut down, battery switches OFF.

Can the RAT be manually deployed?

Answer 20

YES

Control comes from the HOT BATT Busbars

Question 21

What is the normal range

of hydraulic pressure?

Answer 21

3,000 psi +/- 200

Question 22

Following the loss of GREEN, YELLOW

or BLUE due to RSVR OVERHEAT,

LO AIR PR or LO LEVEL,

may the the system be restored for the

approach?

Answer 22

LO AIR PR:

System Pump/PTU as appropriate may be re-activated.

RSVR OVERHEAT:

May be restored if overheat has cooled (FAULT light out)

LO LEVEL:

System is not to be used.

Question 23

The BLUE Pump has failed.

Are we required to deploy the RAT?

Answer 23

No

Question 24

The BLUE pump has failed

&

now the GREEN (or YELLOW) System also fails.

Are we required to deploy the RAT?

Answer 24

YES

Question 25

Which DUAL hydraulic Failure

will NOT put the aircraft into

Alternate Law?

Answer 25

BLUE & YELLOW