Hydraulics

Question 1

What is the minimum HYD reservoir quantity?

Answer 1

.75 RF

Question 2

Why is the demand pump powered by electricity?

Answer 2

Redundancy. Different source of power ensures HYD

Question 3

With dual engine failure, how do we still have control of the Primary Flight Controls?

Answer 3

RAT deploys

Question 4

Whats the minimum Hydraulic quantity for dispatch?

Answer 4

No RF

Question 5

What’s the difference between the C and the L/R reservoirs?

Answer 5

C has stand pipe

Question 6

What’s the purpose of C Reservoir stand pipe?

Answer 6

Capture fluid for reserve brakes and steering

Question 7

Where is the RAT located?

Answer 7

where the wing meets the fuselage on the right side

Question 8

What Systems utilise only the Left Hyraulics?

Answer 8

Primary Flight Controls
Rudder Ratio Changer

Question 9

What systems utilise only the Right Hydraulics?

Answer 9

Primary Flight Controls
Normal Brakes
PES

Question 10

What systems utilise only the Centre Hyraulics?

Answer 10

Flight Controls
Flaps/Slats
Tail Skid
HDG
Alternate Brakes
Nose Steering
Grear Accuator Up and Dow

Question 11

Which hydraulic systems power the Spoilers?

Answer 11

Left Wing (outboard to inboard) 1-6
L, R, C, C, C, L
Right Wing (Inboard to outboard) 7-12
L, C, C, C, R, L
******Confirm

Question 12

Which hydraulic systems power the Stabiliser?

Answer 12

L + C

Question 13

Which hydraulic systems power the Yaw Damper

Answer 13

R power by the L
L powered by the C

Question 14

Which hydraulic system powers the ailerons?

Answer 14

Outboard powered by the L + R
Inboard Left powered by the L+C
Inboard Right powered by the R+C

Question 15

How does the Elec C1 pump provide fluid when quantity below standpipe?

Answer 15

One way check valves

Question 16

What is the minimum HYD quantity for dispatch?

Answer 16

0.75RF

Question 17

Why do the C1 ISLN valves close, with fluid below the standpipe?

Answer 17

Ensure reserve brakes and steering

Question 18

What conditions need to be met for the RAT to deploy in flight:

Answer 18

Main gear logic needs to be met
Powered by Main Bettery Bus
80kts armed
Both engines below idle N2

Question 19

How do you know the RAT deployed?

Answer 19

UNLKD light illuminated

Question 20

How is the RAT manually deployed?

Answer 20

Hot Battery Bus
Push Button

Question 21

What does the Green PRESS light indicate?

Answer 21

RAT producing HYD pressure for flight controls. >130kts

Question 22

When selecting the R HYD electric demand pump AUTO what needs to be checked?

Answer 22

System low pressure light OFF
Demand pump light OFF
Brake source light OFF
3000PSI

Question 23

How can brake pressure be increased on the ground?

Answer 23

Turn on the R electric demand pump

Question 24

What is checked as the C2 pump is selected on?

Answer 24

System low pressure light OFF
C2 pump light OFF

Question 25

What is checked as the C1 pump is selected on?

Answer 25

Check the C1 pump light out only

Question 26

When selecting the L HYD electric demand pump to AUTO, what will you see?

Answer 26

C2 pump on Galley Shed

Question 27

How are yaw dampers controlled?

Answer 27

Electrical control – Normal AC power Hydraulically actuated

Question 28

In the event of a normal AC power failure, how does the Boeing logic power the Yaw dampers?

Answer 28

Standby AC bus

Question 29

What is needed for the yaw dampers to work correctly?

Answer 29

1 IRU Electrical AC power Centre (Left Yaw Damper) and Left (Right Yaw Damper) Hydraulic power

Question 30

What will bring on a single Yaw damper INOP light?

Answer 30

Failure of Centre (Left Yaw Damper) and Left (Right Yaw Damper) Hydraulic power

Question 31

What are the considerations for a Rudder Ratio changer failure at high/low speed?

Answer 31

High speed – large movement of control surface could damage airframe Low Speed – full movement of control surface may not be available ie x-wind

Question 32

What does the HYD OVHT light indicate?

Answer 32

Primary pump is overheating

Question 33

What does the HYD ON/Pressure light indicate?

Answer 33

Primary Pump is On When pump is on its putting out low pressure

Question 34

What is the ELEC/AIR press/OVHT light indicating?

Answer 34

Electric/Air Demand Pump has overheated Electric/Air Demand Pump pressure

Question 35

The HYD selector does what?

Answer 35

Controls selection for the backup supply

Question 36

In the auto position, When does the demand pump work?

Answer 36

High Demand Low Pressure from the Primary pump Boeing commands it

Question 37

How are the flight controls moved?

Answer 37

Input to actuator moves HYD fluid to move surface

Question 38

What happens with a Rudder Ratio changer as airspeed increases?

Answer 38

Boeing desensitises inputs from the pilot

Question 39

When would you expect to see a door and disagree light with regards to the tail skid?

Answer 39

Alternate gear extension. Alternate gear extension does close the doors after they open

Question 40

How are the flaps and slats powered?

Answer 40

Electrically commanded - input to actuator moving HYD fluid through the flap control unit Centre HYD system

Question 41

What is asymmetry protection?

Answer 41

Prevents uncommanded roll Available for LE and TE in normal mode

Question 42

What protections are provided for TE flap in alternate flap extension?

Answer 42

None

Question 43

What is slat disagree?

Answer 43

Flap/slat not in commanded position

Question 44

What fluid is used to set the park brake?

Answer 44

Anti Skid Return fluid

Question 45

When do the electric demand pumps work?

Answer 45

High demand Low pressure Boeing Logic

Question 46

An example for high demand?

Answer 46

Landing gear or flap actuation

Question 47

Example of low pressure for the electric demand pump?

Answer 47

AC Power failure