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Oral Prep 767 > Hydraulics > Flashcards

Hydraulics Flashcards

1
Q

What is the minimum HYD reservoir quantity?

A

.75 RF

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2
Q

Why is the demand pump powered by electricity?

A

Redundancy. Different source of power ensures HYD

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3
Q

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

A

RAT deploys

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4
Q

Whats the minimum Hydraulic quantity for dispatch?

A

No RF

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5
Q

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

A

C has stand pipe

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6
Q

What’s the purpose of C Reservoir stand pipe?

A

Capture fluid for reserve brakes and steering

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7
Q

Where is the RAT located?

A

where the wing meets the fuselage on the right side

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8
Q

What Systems utilise only the Left Hyraulics?

A

Primary Flight Controls
Rudder Ratio Changer

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9
Q

What systems utilise only the Right Hydraulics?

A

Primary Flight Controls
Normal Brakes
PES

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10
Q

What systems utilise only the Centre Hyraulics?

A

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

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11
Q

Which hydraulic systems power the Spoilers?

A

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

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12
Q

Which hydraulic systems power the Stabiliser?

A

L + C

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13
Q

Which hydraulic systems power the Yaw Damper

A

R power by the L
L powered by the C

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14
Q

Which hydraulic system powers the ailerons?

A

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

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15
Q

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

A

One way check valves

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16
Q

What is the minimum HYD quantity for dispatch?

A

0.75RF

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17
Q

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

A

Ensure reserve brakes and steering

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18
Q

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

A

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

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19
Q

How do you know the RAT deployed?

A

UNLKD light illuminated

20
Q

How is the RAT manually deployed?

A

Hot Battery Bus
Push Button

21
Q

What does the Green PRESS light indicate?

A

RAT producing HYD pressure for flight controls. >130kts

22
Q

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

A

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

23
Q

How can brake pressure be increased on the ground?

A

Turn on the R electric demand pump

24
Q

What is checked as the C2 pump is selected on?

A

System low pressure light OFF
C2 pump light OFF

25
Q

What is checked as the C1 pump is selected on?

A

Check the C1 pump light out only

26
Q

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

A

C2 pump on
Galley Shed

27
Q

How are yaw dampers controlled?

A

Electrical control – Normal AC power
Hydraulically actuated

28
Q

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

A

Standby AC bus

29
Q

What is needed for the yaw dampers to work correctly?

A

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

30
Q

What will bring on a single Yaw damper INOP light?

A

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

31
Q

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

A

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

32
Q

What does the HYD OVHT light indicate?

A

Primary pump is overheating

33
Q

What does the HYD ON/Pressure light indicate?

A

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

34
Q

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

A

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

35
Q

The HYD selector does what?

A

Controls selection for the backup supply

36
Q

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

A

High Demand
Low Pressure from the Primary pump
Boeing commands it

37
Q

How are the flight controls moved?

A

Input to actuator moves HYD fluid to move surface

38
Q

What happens with a Rudder Ratio changer as airspeed increases?

A

Boeing desensitises inputs from the pilot

39
Q

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

A

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

40
Q

How are the flaps and slats powered?

A

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

41
Q

What is asymmetry protection?

A

Prevents uncommanded roll
Available for LE and TE in normal mode

42
Q

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

A

None

43
Q

What is slat disagree?

A

Flap/slat not in commanded position

44
Q

What fluid is used to set the park brake?

A

Anti Skid Return fluid

45
Q

When do the electric demand pumps work?

A

High demand
Low pressure
Boeing Logic

46
Q

An example for high demand?

A

Landing gear or flap actuation

47
Q

Example of low pressure for the electric demand pump?

A

AC Power failure

Oral Prep 767 (37 decks)

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