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Ground School Systems 1 > PC-21 Hydraulic System > Flashcards

PC-21 Hydraulic System Flashcards

1
Q

What two hydraulic systems does the PC-21 have?

A
  1. Main system

2. Emergency system

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2
Q

What components of the PC-21 does the hydraulic system power?

A
  1. Landing Gear
  2. Power brakes
  3. Anti-skid
  4. Flaps
  5. Powered Ailerons
  6. Roll Spoilers
  7. Airbrake
  8. Up-lock actuators
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3
Q

What does the emergency hydraulic system do?

A

Powers pertinent parts of the hydraulic system in the event of a main system failure.

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4
Q

What are the main hydraulic system components?

A
  1. Hydraulic pump
  2. Hydraulic shut off valve
  3. Hydraulic reservoir
  4. Power Pack Manifold
  5. Servo filter
  6. Selector Manifold
  7. Servo Manifold
  8. Emergency Accumulator
  9. Emergency hydraulic manifold
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5
Q

Where are the doors to access main components of hydraulic system?

A
  • Two doors lower right side of the engine compartment

- LH rear engine compartment door

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6
Q

Where is the engine driven hydraulic pump located and what is its purpose?

A
  • On the AGB

- Provides pressurized hydraulic fluid to the main hydraulic system upon demand.

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7
Q

What is the capacity of the hydraulic reservoir and what does it do?

A
  • 2.97 L

- Supplies hydraulic fluid to the hydraulic pump

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8
Q

How is the hydraulic shut off valve operated?

A

Pulling FUEL HYD SHUT OFF

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9
Q

What does the power pack manifold do?

A
  1. Hydraulic fluid filtration
  2. Pressure Relief
  3. Isolation from the main hydraulic system when the emergency landing gear is selected.
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10
Q

What does the servo filter do?

A

Provides additional hydraulic fluid filtration to protect servo system components from contamination

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11
Q

What does the selector manifold do?

A

Contains 5 solenoid valves to supply hydraulic pressure to:

  1. Landing gear actuator
  2. Flaps take-off actuator
  3. Flaps Land actuator
  4. Airbrake actuator
  5. Servo manifold
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12
Q

What does the servo manifold do?

A

Provides hydraulic fluid to:

  1. Powered ailerons
  2. Roll spoiler actuators
  3. Powered wheel brakes
  4. Anti-skid valves
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13
Q

What does the emergency hydraulic accumulator do?

A

Stores a volume of pressurized fluid for use in the event of main hydraulic system failure.

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14
Q

What does the emergency hydraulic manifold provide the ability to select?

A
  1. Emergency landing gear extension
  2. Emergency flap extension
  3. Emergency pressure supply to the powered brake system
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15
Q

What are the hydraulic system related cockpit components?

A
  1. EMD
  2. MFDs
  3. DWP
  4. EMER LDG GR handle
  5. TRIM/AIL PWR
  6. FUEL HYD CUTOFF handle.
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16
Q

What hydraulic services rely on power from BATT BUS?

A
  1. Flap selection
  2. TRIM/AIL PWR switch
  3. Landing gear selection
  4. Powered wheel brakes
  5. Powered ailerons
  6. Roll spoilers
17
Q

What hydraulic services rely on power from GEN 2 BUS?

A
  1. Anti-skid

2. Airbrake selection

18
Q

What is electrical power not required for?

A
  1. Emergency landing gear extension

2. Manual braking

19
Q

What is flow of hydraulic system?

A

Engine driven hydraulic pump –> Power pack manifold –> Selector Manifold –> Hydraulic actuators

20
Q

How is the servo manifold controlled?

A

TRIM/AIL PWR switch.

21
Q

During normal operation, what does the main hydraulic system allow unlimited operation of?

A
  1. Landing gear
  2. Powered ailerons
  3. Roll spoilers
  4. Airbrake
  5. Anti-skid
  6. Powered brakes
  7. Flaps
22
Q

What does the main hydraulic system do at engine start?

A

Provides initial charge to emergency hydraulic system

23
Q

What must the pilot do in the event of a malfunction of the normal landing gear extension system?

A

Operate the EMER LDG GR handle

24
Q

What services does the EMER LDG GR handle provide?

A
  1. Landing gear extension one time
  2. 6 applications of powered brakes
  3. Flaps
25
Q

Which display shows a simplified schematic of the main and emergency hydraulic systems?

A

MFD HYD page

26
Q

What are the normal operating ranges for the main hydraulic system?

A

1860 to 3390 psi

27
Q

What are the normal operating ranges for the emergency hydraulic system?

A

2810 to 3740 psi

28
Q

When will hydraulic system pressure be shown as a digital display pop-up?

A

If the hydraulic pressure goes outside the normal limits.

29
Q

What is the stable hydraulic pressure after engine start?

A

3000 psi

30
Q

What are pertinent details to remember when EMER LDG GR handle as been pulled?

A
  1. Landing gear will extend immediately and cannot be retracted
  2. Flaps can be selected to TO and LDG but cannot be retracted
  3. Airbrake and roll spoilers are not available anymore
  4. Ailerons will be by mechanical power only so control forces required will increase.
  5. 6 full applications of the brakes
  6. Anti-skid function is inoperative
31
Q

What does a red HYDS warning on MFD and DWP indicate?

A

Pressure in both hydraulic systems is below 1850 psi.

32
Q

When does an amber HYD MAIN caution appear on the MFD and amber HYD on the DWP?

A

If the pressure of the main hydraulic system drops below 1850 psi.

33
Q

When does an amber HYD EMRG caution and amber HYD caption on the DPW triggered?

A

Emergency hydraulic pressure < 1850 psi

34
Q

What does amber HYD OVPR caution appear on the MFD?

A

When main hydraulic pressure is over 3400 psi

35
Q

What does amber HYD EMRG OVPR caution appear on MFD and EMD?

A

Emergency hydraulic pressure > 3750 psi.

36
Q

When does an amber SERVO caution appear on the MFD?

A
  • Hydraulic power to the wheel brakes an anti-ski is not available
  • TRIM/AIL PWR switch is selected to the OFF position
37
Q

When is the TRIM/AIL PWR switch selected to OFF?

A

If there is a trim runaway

38
Q

When the TRIM/AIL PWR switch is in the off position, what will hydraulic power be cut off to?

A
  1. Aileron actuator
  2. Roll spoiler
  3. Powered brakes valve
  4. Anti-skid valve
39
Q

What does a grey HYD OVPR ALERT of a grey EMRG OVPR ALRT advisory on the MFD mean?

A
  • Overpressure alert function for the respective system is not functional.
  • Respective amber cautions will not be displayed in the event of overpressure.

Ground School Systems 1 (12 decks)

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