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Gulfstream GIV > Hydraulic System > Flashcards

Hydraulic System Flashcards

1
Q

Describe operation of the utility hydraulic system.

A

If the combined system pressure drops below 800 psi, the utility system acts as a backup, drawing fluid from the combined hydraulic system reservoir, and pump motor operation from the flight hydraulic system pressure

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2
Q

From where does the auxiliary hydraulic system pump draw fluid for operation?

A

From the auxiliary section of the combined hydraulic system reservoir

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3
Q

When does the blue “FLT HYD HOT” CAS message illuminate?

A

When temp of fluid in flight hyd system > 220˚ F

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4
Q

If the flight hydraulic fluid is hot, what is the effect on the utility system operation?

A

Utility system operation will be unavailable unless the utility pump is hard-selected ON

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5
Q

What action is required to most accurately determine combined and flight hydraulic system quantities?

A

The hydraulic systems must be pressurized.

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6
Q

If an amber “CMB HYD FAIL” CAS message illuminates, what is the affect on the utility hydraulic pump?

A

The utility hydraulic pump will automatically turn on, if ARMED. When the combined system pressure drops below 800 psi

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7
Q

If a blue “FLT HYD HOT” CAS message illuminates while the utility hydraulic pump is in use, what is the affect on the utility hydraulic pump?

A

The utility pump will automatically turn OFF unless it is hard-selected to ON

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8
Q

If the combined hydraulic system pump fails and hydraulic fluid is still available, what systems are lost?

A

Left thrust reverser

Standby electrical power system (ABEX / HMG)

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9
Q

With a loss of combined system fluid, what systems are not available?

A
  • U tility Hydraulic System
  • N ose wheel steering
  • N ormal landing gear operation
  • S tall barrier system
  • A BEX / Stby Elec Pwr Sys / HMG
  • T R (LH)
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10
Q

With a loss of the flight hydraulic system pump and/or fluid, what systems are not available?

A
  • Yaw damper and auto pilot
  • Utility hydraulic pump operation
  • TR (RH)
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11
Q

What is indicated by a green “REV ARM” light on touchdown?

A

TRs are armed and available for use, as sensed by

Idle power levers and:
- nutcrackers in ground mode (WOW)
OR
- wheel-speed spin-up if ASC 166 (>65)

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12
Q

Which hydraulic systems are capable of providing normal braking with anti-skid protection?

A

Combined
Utility
Auxiliary

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13
Q

What is the normally configured position of the utility pump in flight?

A

ARMED

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14
Q

With a loss of combined hydraulic fluid, what is the primary reason that the aux hydraulic pump is selected ON prior to landing?

A

To allow the ground spoilers to operate normally

  • Braking is secondary, as braking should occur when the brake pedals are depressed with the aux pump in the ARMED position
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15
Q

What action is required if a red “REV UNLOCK” CAS message illuminates in flight?

A
  • Reduce power on the affected engine
  • Select the emergency stow switch to STOW
  • Maintain a maximum airspeed of 200 KCAS
  • Then run the QRH
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16
Q

How is the auxiliary hydraulic pump powered?

A

DC powered through the battery tie bus

17
Q

How can the utility hydraulic system be actuated?

A
  • Manually by the pilot

- Automatically in the event of a combined hydraulic failure, if ARMED

18
Q

When armed, what conditions will cause the Auxiliary Hydraulic Pump to turn ON automatically?

A
  • Either Nutcracker in the Ground Mode
  • Combined and Utility pressures < 1500 psi (HMG)
  • Toe Brake Pedal depressed > 10˚ (BBW)
20
Q

What capabilities are lost if you lose the Flight Hydraulic System pressure?

A
  • Yaw Damper
  • Auto-pilot due to Yaw Damper
  • Right Thrust Reverser
  • Utility Pump Motor
21
Q

The Utility Pump is driven by Flight Hydraulic System pressure and uses Combined Hydraulic System fluid. When armed, what will cause it to turn ON automatically?

A

CAS Message indicating a combined system failure or combined system pressure falling to < 800 psi.

22
Q

When the Utility Pump is armed, what conditions will prevent automatic Utility Pump operation?

A

CAS Message Indicating Flight Hydraulic System fluid temperature is > 220° F

22
Q

The Auxiliary Hydraulic pump is capable of powering which components? (6)

A
  • Main Entrance Door
  • Wing Flaps
  • Brakes (Normal Antiskid)
  • Parking/Emergency Brakes
  • Landing Gear/Doors (ground only)
  • Cargo Door (military aircraft only)
23
Q

Anti-Skid Braking is available from which hydraulic systems?

A

Combined
Utility
Aux

24
Q

Type of Hydraulic Fluid used?

Exceptions?

A
  • Skydrol

- Gear struts use 5606

Gulfstream GIV (21 decks)

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