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GL7500 > Hydraulics > Flashcards

Hydraulics Flashcards

1
Q

Which Pumps supply Normal Hydraulic pressure to the Hydraulic System?

A

The 3 A Pumps ( two EDPs 1A & 2A + one ACMP 3A) which operate continuously.

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2
Q

How many ACMP Pumps may be operating on the ground while on APU or External Power?

A
  • 2 ACMP (a Single Generator can handle a maximum of 2 pumps).
    Note: Above 43,000 ft only 1 ACMP.
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3
Q

Which Hydraulic Systems are powered by the EDP?

A

Systems 1 & 2 by EDP 1A & 2A.

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4
Q

What is the Nominal Hydraulic System Pressure?

A

Nominal Hydraulic System Pressure: 3,000 psi.

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5
Q

How are the Primary Flight Controls controlled and actuated?

A
  • Electronically by the FBW Fly-by-Wire System;
  • Hydraulically actuated by PCUs (Power Control Units).
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6
Q

Which Hydraulic Systems power the Aileron PCUs?

A
  • Left Aileron: Hydraulic System 1 and 3;
  • Right Aileron: Hydraulic System 2 & 3.
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7
Q

Which Hydraulic Systems power the Elevator PCUs?

A
  • Left Elevator: Hydraulic Systems 1 & 3;
  • Right Elevator: Hydraulic Systems 2 & 3.
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8
Q

Which Hydraulic Systems power the Rudder PCUs?

A

All. Hydraulic Systems 1, 2 & 3.

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9
Q

Which Hydraulic Systems operate the Landing Gear?

A
  • Hydraulic System 2: Nose Landing Gear + NWS.
  • Hydraulic System 3: Main Landing Gear Retraction, Assistance for Extension.
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10
Q

What Type of Hydraulic fluid is used in the Airplane?

A

Skydrol (low density fluid), Phosphate Ester Type IV or V.

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11
Q

How is the Hydraulic Fluid cooled?

A

2 Fuel/Oil Heat Exchangers located in the Fuel Tanks.

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12
Q

How is the Hydraulic Reservoir Quantities accurately checked before Engine Start?

A

-Turn ON the “B”(ACMP 1B & 3B) and PTU Pumps to pressurize the System;
- Use the Hydraulic Synoptic page to read the value;
- Note: The quantity indications are only accurate when the System is Pressurized.

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13
Q

What should the Brake Accumulators pre-charge pressure be when the Hydraulic System is Depressurized?

A

650psi +/- 100psi.

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14
Q

What are the Electrically Driven Hydraulic Pumps and their associated electrical power source?

A
  • 1B & 3A = AC BUS 2
  • 3B & PTU = AC BUS 1
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15
Q

When in AUTO, when will the ACMP 1B operate?

A
    1. When the Airplane is in the Takeoff or Approach phase;
    1. EDP 1A has failed or LH Engine is Not running in flight;
    1. The PTU valve is enabled (EDP 2A has failed or RH Engine is Not running).
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16
Q

When in AUTO, when will the PTU operate?

A
    1. When the airplane is in the Takeoff or Approach phase;
    1. EDP 2A has failed or RH engine is not running in flight;
    1. On the ground with only the LH Engine running and Parking Brake released.
17
Q

When in AUTO, when will the ACMP 3B operate?

A
  • When the airplane is in the Takeoff or Approach phase;
  • ACMP 3A has failed.
18
Q

How can the EDP HYD SOVs be closed?

A
    1. The L (R) HYD SOV guarded PBA on the Hydraulic Panel is pressed;
    1. The L (R) ENG FIRE guarded PBA on the FIRE Panel is pressed;
    1. Temperature sensors on the HYD Systems 1 & 2 reservoirs detect Excessive Fluid Temperature 125°C.
  • Note: 104°C = Amber “HYD 1 (2) HI TEMP”
    125°C = HYD SOV closes “L (R) HYD SOV CLOSED”
    143°C = Thermal fuse ruptures (reservoir discharges fluid overboard).
19
Q

Which Hydraulic Pumps are available/operating during Single Generator operations in flight?

A
  • Operating EDP (Engine Hydraulic Pumps);
  • Maximum of 2 ACMPs can be powered by a Single Generator;
  • Except for APU above 43,000 ft where only 1 ACMP can be powered by the APU Generator.
20
Q

Which Hydraulic System can be powered by the RAT (Ram Air Turbine)?

A

Hydraulic System 3.

21
Q

What’s the RAT/Bootstrap Accumulator pre-charge pressure when the Hydraulic System is Depressurized?

A

1,100 psi +/- 100psi.

22
Q

What’s the Fwd and Aft Accumulator pre-charge pressure when the Hydraulic System is Depressurized?

A
  • 1,300psi +/- 100psi.
    Note: The Fwd and Aft accumulators provide momentary Hyd pressure while the RAT is in transit.
    All 3 Accumulators are on Hydraulic System 3.

GL7500 (16 decks)

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