Hydraulics

Question 1

How many hydraulic systems?

Answer 1

4

Question 2

What are the hydraulic systems?

Answer 2

1 and #2 Main HYD systems

#3 HYD system
#4 auxiliary HYD system for emergency main landing gear extension

Question 3

What pressurises the main hydraulic systems?

Answer 3

Engine driven pumps

Question 4

What is the nominal press for EDP?

Answer 4

3000psi

Question 5

Backup pressure source for #1 HYD system is?

Answer 5

Standby hydraulic pump which is selected on for takeoff off and landing

Question 6

Backup pressure source for #2 HYD system?

Answer 6

PTU power transfer unit and selected on for normal takeoff and landing

Question 7

What does the PTU do and what is it powered by?

Answer 7

Powered by #1 HYD system and pressurise the #2 system

Question 8

What does the #3 HYD system do?

Answer 8

Provide HYD pressure for left and right elevator inboard power control units (PCUs).

Question 9

When is #3 HYD system used?

Answer 9

Auto operation when failure of # 1 or #2 HYD system or failure of both engines (emergency hydraulic power to the elevators)

Question 10

What is the #4 HYD system used for?

Answer 10

Alternate landing gear extension. System is manually operated with a hand pump for alternate main landing gear extension

Question 11

Where is the EDP mounted?

Answer 11

Propeller reduction gearbox

Question 12

1 HYD quantity?

Answer 12

8 quarts reservoir
40% min dispatch

Question 13

SPU Standby power unit used for?

Answer 13

Back up power for #1 system
Variable 115V AC

Question 14

2 quantity?

Answer 14

12 quarts
40% min dispatch

Question 15

Where is the #3 HYD system located?

Answer 15

Aft equipment compartment on the side wall

Question 16

3 HYD system quantity?

Answer 16

2.6 quarts
45% min dispatch

Question 17

What pressures the #3 HYD system?

Answer 17

The DCMP DC motor pump, it is electrically powered by the standby battery

Question 18

3 system pressure psi?

Answer 18

2600 - 3250psi

Question 19

How to manually activate #3 HYD system?

Answer 19

Push switch light on hydraulic control panel

Question 20

What provides hydraulic power for elevator control with the loss of the EDPs, standby hydraulic pump and PTU?

Answer 20

The #3 hyd system

Question 21

4 HYD sys reservoir located?

Answer 21

Right forward lower nose compartment

Question 22

4 HYD system reservoir quantity?

Answer 22

1.0 QTS

Question 23

1 HYD system includes?

Answer 23

Brakes
Flaps
Anti skid
Inboard roll spoilers
Rudder Lower power control unit
Elevators outboard power control units (PCUs)
PTU

Question 24

2 HYD system includes?

Answer 24

Landing gear
Outboard roll spoilers
Nose wheel steering
Emergency and park brake
Rudder upper PCU
Elevator centre PCUs

Question 25

Where are the pressure and quantities for the HYD systems? (Flight deck)

Answer 25

Permanent system area (PSA) on MFD 2

Question 26

How to turn on the SPU?

Answer 26

Press the STBY HYD PRESS switch light on the hydraulic control panel. Only available with AC

Question 27

The SPU on light will only be green when?

Answer 27

Manually pressed. Not when auto activated by flaps greater than 0 or number 1 EF

Question 28

What does the green hashed lines on the PTU mean?

Answer 28

Indicates the PTU is producing normal pressure

Question 29

When is PTU automatically activated?

Answer 29

Flaps greater than zero or #2 EF

Question 30

FAIL on the PTU switch light?

Answer 30

When pressure in #2 HYD system is below 1500psi and PTU is not operating

Question 31

To open the #3 isolation valve you?

Answer 31

Press the HYD #3 ISOL VLV switch light

Question 32

Will the OPEN amber light illuminate on the HYD #3 ISOL VLV if it’s automatic?

Answer 32

No only if manually pressed

Question 33

#1 or 2 HYD ISO VLV caution light?

Answer 33

The valves in the main two tanks are normally open but they will close and get a caution light due to a sensed low fluid quantity in the reservoir

Question 34

#1 HYD ISO VLV what fluid supply is lost and kept?

Answer 34

Lost: brakes, anti skid and inboard spoilers Kept: flaps, PTU, rudder and elevators LONE(#2) BAI (#1)

Question 35

#2 HYD ISO VLV what fluid supply is lost and kept?

Answer 35

Lost: landing gear, nose wheel steering, outboard roll spoilers and emergency and parking brake Kept: rudder and elevators

Question 36

What do you lose if the #1 priority valve closes due to pressure below 2100psi?

Answer 36

Flaps and PTU

Question 37

What is a FSOV?

Answer 37

Firewall shutoff valves

Question 38

What do the FSOV do?

Answer 38

Stops the flow of fluid from the reservoir to the EDP

Question 39

How do you control the FSOV?

Answer 39

ENGINE 1 or ENGINE 2 PULL FUEL/HYD OFF handle

Question 40

Fluid over reservoir at 107 degrees what caution light?

Answer 40

#1 or 2 HYD FLUID HOT

Question 41

If fluid reaches 135 degrees in reservoir what happens?

Answer 41

FSOV closes automatically

Question 42

If all hydraulic fluid is lost what happens?

Answer 42

FSOV closes automatically and white CLOSED light illuminates on overhead panel

Question 43

If you lose all HYD fluid in the main two systems what caution light will you see?

Answer 43

#1 or 2 HYD ISO VLV The iso valve has therefore closed to provide power to the users of that system

Question 44

Failure of EDP caution light?

Answer 44

# 1 or 2 ENG HYD PUMP

Question 45

Number 1 STBY HYD PUMP HOT caution light

Answer 45

If the pumps electric windings overheat

Question 46

Number 3 STBY HYD PUMP caution light?

Answer 46

If accumulator pressure drops to 900psi or the DCMP has been operating longer than 60secs while in the ground with an eng running

Question 47

ELEVATOR PRESS caution light

Answer 47

If the #3 HYD system isolation valve is in the open position during normal operations

Question 48

Auto activation of the STBY hydraulic pump occurs?

Answer 48

With #1 EF

Question 49

The rudder upper power control unit (PCU) is supplied by which hydraulic system?

Answer 49

#2

Question 50

The hydraulic system used for alternate gear extension is powered by?

Answer 50

Hand pump

Question 51

Inboard roll spoilers are supplied by which hydraulic system?

Answer 51

#1

Question 52

PTU operation requires normal?

Answer 52

#1 HYD system pressure and #2 hydraulic reservoir greater than 0

Question 53

The capacity of the #2 hydraulic reservoir is?

Answer 53

12 quarts

Question 54

The rudders lower power control unit (PCU) is supplied by which hydraulic system?

Answer 54

#1 HYD system

Question 55

The location of the #3 hydraulic reservoir?

Answer 55

The aft equipment compartment

Question 56

How many hydraulic systems are there in the aircraft?

Answer 56

4

Question 57

Opening the landing gear alternate extension door?

Answer 57

Mechanically closes the selector control valve

Question 58

When closed, the Firewall shut off valve (FSOV) in the #2 hydraulic system?

Answer 58

Stops the flow of hydraulic fluid in the reservoir to the engine driven pump

Question 59

Each engine driven pumps is mounted?

Answer 59

On the propeller reduction gearbox

Question 60

Illumination of the #1 STBY PUMP HOT caution light illuminates?

Answer 60

The electric windings in the pump are overheating

Question 61

A backup source of pressure for the #2 hydraulic system is?

Answer 61

PTU

Question 62

Main hydraulic system fluid temperature is regulated by?

Answer 62

A hydraulic/ fuel heat exchanger and thermal bypass valve

Question 63

The minimum dispatch quantity for the #3 hydraulic system is

Answer 63

45%

Question 64

The #4 hydraulic system reservoirs quantity is measured by?

Answer 64

A dipstick

Question 65

Hydraulic quantity indications for all four hydraulic systems can be found?

Answer 65

In gauges or a dipstick on the respective reservoirs

Question 66

Closure of the #1 hydraulic isolation valve isolates?

Answer 66

Brakes, anti skid and inboard spoilers

Question 67

The amber open annunciation on the HYD #3 ISOL VLV switch light illuminates?

Answer 67

When the isolation valve is opened manually