Hydraulics System

Question 1

HYDRAULICS

What provides system A and B reservoir pressure

Answer 1

Bleed air

Sby system is connected to Sys B reservoir for pressure

Question 2

HYDRAULICS

Minimum fuel for ground operation of electric motor-driven pumps

Answer 2

760kgs in the related main tank

Question 3

HYDRAULICS

System A Leak in Electric Driven Pump - what does the fluid level reduce to

Answer 3

indicates 0%

Question 4

HYDRAULICS

System A Leak in Engine Driven Pump - what does the fluid level reduce to

Answer 4

indicates approx 20% as fluid is provided by a standpipe

Question 5

HYDRAULICS

System B Hydraulic Leak in Electric Pump

Answer 5

indicates 0% and system B pressure is lost. Fluid remaining in system B reservoir is sufficient for PTU operation

Question 6

HYDRAULICS

System B Hydraulic Leak in Engine Pump

Answer 6

indicates 0% and system B pressure is lost. Fluid remaining in system B reservoir is sufficient for PTU operation

Question 7

HYDRAULICS

Purpose of the PTU

Answer 7

Supplies the additional volume of hydraulic fluid needed to operate the autoslats and leading edge flaps and slats at the normal rate when system B engine-driven hydraulic pump volume is lost.

Question 8

HYDRAULICS

PTU operates automatically when all of the following conditions exist:

Answer 8

System B engine-driven pump hydraulic pressure drops below limits

airborne

flaps are less than 15 but not up.

SFP/MAX
flaps not up

Question 9

HYDRAULICS

Landing Gear Transfer Unit Purpose

Answer 9

provides volume of hydraulic fluid needed to raise landing gear at normal rate when Sys A engine-driven pump volume is lost.

Volume provided by the System B engine driven pump

Question 10

HYDRAULICS

Landing Gear Transfer Unit operates when:

Answer 10

Airborne

No. 1 engine RPM drops below a limit value

landing gear leaver is positioned UP

either main landing gear is not up and locked

Question 11

HYDRAULICS

Standby Hydraulic System powers:

Answer 11

uses a singel electric motor-driven pump to power:

thrust reversers
rudder
leading edge flaps and slats (extend only)
standby yaw damper

Question 12

HYDRAULICS

Standby Hydraulic System Manual Operation Description positioning FLT CONTROL switch to STBY RUD:

Answer 12

Positioning either FLT CONTROL switch to STBY RUD:

• activates sby pump
• shuts off related hydraulic system pressure to ailerons, elevators and rudder by closing flight control shutoff valve
• opens stby rudder shutoff valve
• allows the sby rsystem to power rudder and thrust reversers

Question 13

HYDRAULICS

Standby Hydraulic System
positioning ALTERNATE FLAPS switch to ARM

Answer 13

• Activates sby pump
• Closes trailing edge flap bypass valve
• Arms ALTERNATE FLAPS position switch
• Allows sby system to power leading edge flaps and slats and thrust reversers

Question 14

HYDRAULICS

Standby Hydraulic System Automatic Operation
initiated:

Answer 14

• loss of system A or B, and
• flaps extended, and
• airborne or wheel speed greater than 60kts, and
• FLT CONTROL switch A or B hydraulic system ON

OR

main PCU force flight monitor (FFM) trips

Question 15

HYDRAULICS

Standby Hydraulic System Automatic Operation does what:

Answer 15

• activates sby pump
• opens sby rudder shutoff valve
• allows sby system to power the rudder and thrust reversers

Question 16

HYDRAULICS

Standby Hydraulic System Leak in reservoir quantity decreases to

Answer 16

0%

Question 17

HYDRAULICS

Standby Hydraulic System leak in reservoir B system quantity decreases to

Answer 17

72%

Question 18

HYDRAULICS

Variations in hydraulic quantity indications occur when

Answer 18

• system becomes pressurised after engine start
• raising or lowering the landing gear or leading edge devices
• cold soaking occurs during long periods of cruise

note: have little effect on systems operation.