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Q400 > Hydraulics > Flashcards

Hydraulics Flashcards

1
Q

How many hydraulic systems?

A

4

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2
Q

What are the hydraulic systems?

A

1 and #2 Main HYD systems

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

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3
Q

What pressurises the main hydraulic systems?

A

Engine driven pumps

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4
Q

What is the nominal press for EDP?

A

3000psi

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5
Q

Backup pressure source for #1 HYD system is?

A

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

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6
Q

Backup pressure source for #2 HYD system?

A

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

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7
Q

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

A

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

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8
Q

What does the #3 HYD system do?

A

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

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9
Q

When is #3 HYD system used?

A

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

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10
Q

What is the #4 HYD system used for?

A

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

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11
Q

Where is the EDP mounted?

A

Propeller reduction gearbox

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12
Q

1 HYD quantity?

A

8 quarts reservoir
40% min dispatch

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13
Q

SPU Standby power unit used for?

A

Back up power for #1 system
Variable 115V AC

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14
Q

2 quantity?

A

12 quarts
60% min dispatch

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15
Q

Where is the #3 HYD system located?

A

Aft equipment compartment on the side wall

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16
Q

3 HYD system quantity?

A

2.6 quarts
40% min dispatch

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17
Q

What pressures the #3 HYD system?

A

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

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18
Q

3 system pressure psi?

A

2600 - 3250psi

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19
Q

How to manually activate #3 HYD system?

A

Push switch light on hydraulic control panel

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20
Q

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

A

The #3 hyd system

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21
Q

4 HYD sys reservoir located?

A

Right forward lower nose compartment

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22
Q

4 HYD system reservoir quantity?

A

1.0 QTS

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23
Q

1 HYD system includes?

A

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

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24
Q

2 HYD system includes?

A

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

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25
Q

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

A

Permanent system area (PSA) on MFD 2

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26
Q

How to turn on the SPU?

A

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

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27
Q

The SPU on light will only be green when?

A

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

28
Q

What does the green hashed lines on the PTU mean?

A

Indicates the PTU is producing normal pressure

29
Q

When is PTU automatically activated?

A

Flaps greater than zero or #2 EF

30
Q

FAIL on the PTU switch light?

A

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

31
Q

To open the #3 isolation valve you?

A

Press the HYF #3 ISOL VLV switch light

32
Q

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

A

No only if manually pressed

33
Q

1 or 2 HYD ISO VLV caution light?

A

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

34
Q

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

A

Lost: brakes, anti skid and inboard spoilers
Kept: flaps, PTU, rudder and elevators

35
Q

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

A

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

36
Q

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

A

Flaps and PTU

37
Q

What is a FSOV?

A

Firewall shutoff valves

38
Q

What do the FSOV do?

A

Stops the flow of fluid from the reservoir to the EDP

39
Q

How do you control the FSOV?

A

ENGINE 1 or ENGINE 2 PULL FUEL/HYD OFF handle

40
Q

Fluid over reservoir at 107 degrees what caution light?

A

1 or 2 HYD FLUID HOT

41
Q

If fluid reaches 135 degrees in reservoir what happens?

A

FSOV closes automatically

42
Q

If all hydraulic fluid is lost what happens?

A

FSOV closes automatically and white CLOSED light illuminates on overhead panel

43
Q

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

A

1 or 2 HYD ISO VLV

The iso valve has therefore closed to provide power to the users of that system

44
Q

Failure of EDP caution light?

A

1 or 2 ENG HYD PUMP

45
Q

1 STBY HYD PUMP HOT caution light

A

If the pumps electric windings overheat

46
Q

3 STBY HYD PUMP caution light?

A

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

47
Q

ELEVATOR PRESS caution light

A

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

48
Q

Auto activation of the STBY hydraulic pump occurs?

A

With #1 EF

49
Q

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

A

2

50
Q

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

A

Hand pump

51
Q

Inboard roll spoilers are supplied by which hydraulic system?

A

1

52
Q

PTU operation requires normal?

A

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

53
Q

The capacity of the #2 hydraulic reservoir is?

A

12 quarts

54
Q

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

A

1 HYD system

55
Q

The location of the #3 hydraulic reservoir?

A

The aft equipment compartment

56
Q

How many hydraulic systems are there in the aircraft?

A

4

57
Q

Opening the landing gear alternate extension door?

A

Mechanically closes the selector control valve

58
Q

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

A

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

59
Q

Each engine driven pumps is mounted?

A

On the propeller reduction gearbox

60
Q

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

A

The electric windings in the pump are overheating

61
Q

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

A

PTU

62
Q

Main hydraulic system fluid temperature is regulated by?

A

A hydraulic/ fuel heat exchanger and thermal bypass valve

63
Q

The minimum dispatch quantity for the #3 hydraulic system is

A

40%

64
Q

The #4 hydraulic system reservoirs quantity is measured by?

A

A dipstick

65
Q

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

A

In gauges or a dipstick on the respective reservoirs

66
Q

Closure of the #1 hydraulic isolation valve isolates?

A

Brakes, anti skid and inboard spoilers

67
Q

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

A

When the isolation valve is opened manually

Q400 (24 decks)

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