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Hawk Tech > Hydraulic System > Flashcards

Hydraulic System Flashcards

1
Q

What side of the aircraft and part of the wing does each hyd system work along?

A

Hyd 1: RHS of aircraft, leading edges of wings.

Hyd 2: LHS of aircraft, rear wing spars.

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2
Q

List the things that the Hyd 1 and Hyd 2 systems power.

A 
Hyd 1:
Tailplane, aileron and rudder PFCUs.
Landing Gear
NWS
Flaps
Airbrake
Wheelbrakes
Anti-skid
Q-feel system

Hyd 2:
Tailplane and aileron PFCUs

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3
Q

What is the purpose of an accumulator in each hyd system?

A

To give short term redundancy in case of a sudden hyd failure.

To damp out any fluctuations in provided pressure and provide an instantaneous to hyd demands.

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4
Q

Below what Hyd 2 pressure does the RAT deploy?

A

1500+-100psi

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5
Q

Below what pressure does the PMV valve operate in the Hyd 1 system?

What is the purpose of the PMV.

A

1500+-100psi

The purpose of the Pressure Maintaining Valve is to prioritise powering the PFCUs over other parts of the hyd 1 system in case of a fall in hyd pressure.

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6
Q

What pressure does the Gear standby lowering system provide?

A

3300psi

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7
Q

What pressure does the Flap standby lowering system provide for?

A

3000psi.

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8
Q

What pressure is the RAT regulated to provide?

What regulates this?

A

It will cycle between 2400 and 3000psi.

A cut-out valve.

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9
Q

What engine RPM and Hyd 2 EDP pressure is required for Hyd 2 system to be reset and the RAT retracted?

A

76% RPM

2000psi.

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10
Q

What position do the flaps need to be in during the walkaround?

A

Down

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11
Q

What hyd pressure do the hyd systems provide when working normally?

A

3000psi

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12
Q

Where is the Hyd 1 flying controls accumulator pressure gauge located?

What pressure should it read on the walkaround?

A

In the right undercarriage bay.

1100psi.

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13
Q

Where is the wheelbrake accumulator pressure gauge located?

What pressure should it read on the walkaround?

A

In the right undercarriage bay/

1250psi.

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14
Q

Where is the Hyd 2 flying controls accumulator pressure gauge located?

What pressure should it read on the walkaround?

A

In the left undercarriage bay.

1100psi.

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15
Q

Where are the landing gear and flap standby system pressure gauges located?

What should they read on the walkaround?

A

In the left undercarriage bay.

Gear: 3300psi
Flap: 3000psi

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16
Q

What is the purpose of the wheelbrake accumulator?

A

To maintain pressure for the wheelbrakes so you can still apply brakes on landing.

17
Q

What pressure does the wheelbrake accumulator maintain once charged by Hyd 1 system?

What is the accumulator base pressure (i.e. the pressure that should be shown on the dial in the undercarriage bay on walkaround)?

A

3000psi

1250psi.

18
Q

If Hyd 1 has failed and you are relying on the wheelbrake accumulator for braking force, how must you brake?

A

In a single steady application.

Do not apply on and off again and again - you will find yourself without brakes.

19
Q

How many hydraulic jacks operate the flaps?

Why?

A

1

To minimize the chance of asymmetric flaps.

20
Q

State the number of jacks used in the landing gear system, and what each of them move.

A

5 jacks.

R main wheel.
L main wheel.
R main door.
L main door.
Nose gear.
21
Q

What would happen if you were to fully apply the foot brakes and parking brake?

A

You will damage valves in the wheelbrake system.

22
Q

What wheelbrake accumulator pressure will give you a boxed S?

A

2755 - 3150psi

23
Q

What wheelbrake accumulator pressure will give you an unboxed S?

A

1250-2755psi

24
Q

Below what wheelbrake accumulator pressure will give you a flashing unboxed S?

What implications does this have?

A

Below 1250psi

You have no brake pressure available to use.

25
Q

At what Hyd 1 pressure does the pressure maintaining valve act?

What does it do?

A

1500psi

It prioritises Hyd 1 pressure to the flying controls, Q feel and Yaw damper parts of the system. Everything else is cut off from the Hyd 1 pump.

26
Q

At what Hyd 2 pressure does the RAT activate?

A

1500+-100psi.

27
Q

At what Hyd 1 pressure does the Yaw Damper and Q feel stop working?

A

650psi

28
Q

What is the purpose of the Hyd 2 system bypass valve?

A

A valve that opens and de-powers the Hyd 2 system to reduce the torque on the engine during engine start and relights.

29
Q

Below what RPM is the Hyd 2 system bypass solenoid energized to open the valve?

A

42%NH

30
Q

What speed is the RAT effective down to?

What is the minimum speed used on an approach when relying on the RAT?

A

Less than 105kts.

130kts.

31
Q

If recovering on RAT power alone, what is the minimum threshold speed you should use?

A

130kts.

32
Q

What happens to the wheelbrake system if Hyd 1 falls below 1500psi?

A

The PMV will operate and the accumulator will maintain the 3000PSI required.

Hawk Tech (16 decks)

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