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systems > Hydraulics > Flashcards

Hydraulics Flashcards

1
Q

The aircraft has how many hydraulic systems

A

3

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2
Q

What items on the aircraft use hydraulic power

A 
1. Landing Gear
2 Flight Controls
3 Spoilers
4 Nose wheel stearind
5. Brakes
6 Thrust Reversers
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3
Q

Do the fluids mix between systems?

A

No

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4
Q

What type of fluid does it use and what PSI

A

3000 psi

Skydrol Hydraulic Fluid

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5
Q

What does the Engine Hydraulic Pump Shutoff Button Do

A

Closes the hydraulic shutoff valve. Isolating the EDP from the hydraulic system.

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6
Q

In flight when do the ACMP turn on?

A
  1. Engine Failure

2. Flaps greater than zero

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7
Q

On the ground when do the ACMP activate?

A
  1. Flaps greater than zero and
    - thrust levers set to takeoff - 70 TLA
    Or
    - 50kts
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8
Q

What system is the Landing Gear and Nose Wheel starring on?

A

System 2. That’s why it had a Power transfer Unit

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9
Q

What temp do you get a Caution HYD 2 HI TEMP EICAS message

A

100 degrees

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10
Q

ACMP 2 will turn on on the ground when?

A
  1. Same items as EDP #1

2. Engine 1 running and parking break released.

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11
Q

What powers the PTU? And what is it’s purpose?

A

Mechanically driven by hydraulic system 1. No Electricity.

Connected to system 2 to aid in Gear retraction or extension, and aid in case the EDP 2 fails or Engine 2 fails

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12
Q

When does the PTU activate

A

It activates only in the air. When all these conditions are met.

  1. EDP 1 is working
  2. Flaps greater than zero or Gear not up and locked
  3. Reservoir 2 is greater than 12%
  4. Engine 2 and or EDP fails
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13
Q

When does ACMP 3B turn on

A
  1. If ACMP 3A fails

2. If selected to ON. Than it runs continuously

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14
Q

During an electrical failure what powers the flight controls while the RAT comes out?

A

The accumulator.

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15
Q

What ACMP does the RAT power?

A

3A via the AC ESS BUS

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16
Q

Why is single engine taxi done on Eng 1

A

Because when Engine 1 is on. ACMP 2 turns on when parking brake is off powering inboard brakes and Nose wheel steering.

17
Q

What is the purpose of the PTU

A

To back up EDP 2

18
Q

At what reservoir temperature must you do a Hydraulic System Warm-up

A

-18C

19
Q

What will interrupt the Hydraulic PBIT?

A

Movement of the flight controls.

20
Q

“FLT CTRL TEST IN PROG” message will appear after starting engine #1 and after the parking brake is released. What does it indicate?

A

The Hydraulic Porting of the Flight Control check is in progress.

21
Q

What engine should you start first?

A

Engine #1. Hydraulic ACMP 2 will automatically come on with the left engine running, the parking brake off, and the knob in AUTO.

22
Q

Can we depart with AMBER brake Temp indications?

A

NO

23
Q

The emergency parking brake has its own accumulators that will give you how many brake applications with both system 1 and 2 de-pressurize?

A

6 applications

24
Q

If hydraulic pump 3A fails on the ground, will it turn on 3B automatically?

A

No 3B will only turn on automatically in the air.

25
Q

Why is Hydraulic Pump 3A have ON or OFF

A

Because we want to make sure that if the RAT power 3A with no interruption.

26
Q

What systems are on Hydraulic System 2 that is important?

A
  1. Inboards Brakes
  2. Landing Gear
  3. Nose Wheel Steering
27
Q

When Will Hydraulic Pump 2A turn on, on the ground for taxi?

A
  1. Engine 1 is running
  2. Realized Parking Brake
  3. The Pump stays on for 6 minutes after the brake is set.
28
Q

Why do we have a PTU

A

EDP -> 19 gal/m - 3000psi
ACMP 2 -> 3.7 gal/m - 3000psi

The ACMP 2 does not retract or extend the gear fast enough so the PTU is there to provide more flow rate in system 2.

29
Q

When does the PTU Turn on

A
  1. Flaps greater than zero OR

2. Gear not up and locked

30
Q

What temperature does the Warning HYD 1 OVERHEAT

A

145 C Degrees

31
Q

What temperature does the Engine Hydraulic shutoff valve close?

A

125 C Degrees

systems (20 decks)

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