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GulfStream IV serial # 1214-subsequent > Hydraulic System > Flashcards

Hydraulic System Flashcards

1
Q

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

A

Yaw Damper
Right Thrust
Reverser Utility Pump Motor
Auto-pilot due to Yaw Damper

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2
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 less than 800 psi.

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3
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 greater than 220°F

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4
Q

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

A

Either Nutcracker in the Ground Mode and Combined and Utility pressures less than 1500 psi (HMG) and
Toe Brake Pedal depressed greater than 10 degrees (BBW)

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5
Q

The Auxiliary Hydraulic pump is capable of powering which components?

A 
Main Entrance Door
Wing Flaps
Brakes
Main Door 
Parking/Emergency Brakes Landing Gear/Doors (ground only) Cargo Door (military aircraft only)
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6
Q

Anti-Skid Braking is available from which hydraulic systems?

A

Combined Hydraulic System
Utility Hydraulic System
Aux Hydraulic System

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7
Q
  1. 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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8
Q
  1. 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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9
Q
  1. When does the blue “FLT HYD HOT” CAS message illuminate?
A

When the temperature of the hydraulic fluid in the flight system exceeds 220º F

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10
Q
  1. If the flight hydraulic fluid is hot, what is the effect on the utility system
    operation?
A

Utility system operation will not be available unless the utility pump is
hard-selected to ON

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11
Q
  1. 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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12
Q
  1. 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

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13
Q
  1. 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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14
Q
  1. 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 (HMG)

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15
Q
  1. With a loss of combined system fluid, what systems are not available?
A 
Left thrust reverser  
Standby electrical power system (HMG)  
Stall barrier system  
Nose wheel steering  
Normal landing gear operation  
(Utility Hydraulic System)
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16
Q
  1. With a loss of the flight hydraulic system pump and/or fluid, what systems are
    not available?
A

Right thrust reverser
Utility hydraulic pump operation
Yaw damper and auto pilot

17
Q
  1. What is indicated by a green “REV ARM” light on touchdown?
A

The thrust reversers are armed and available for use, sensed by nutcrackers
switching to the ground mode, or through wheel-speed spin-up on most aircraft
and idle power levers.

18
Q
  1. Which hydraulic systems are capable of providing normal braking with anti-
    skid protection?
A

Combined
Utility
Auxiliary

19
Q
  1. What is the normally configured position of the utility pump in flight?
A

ARMED

20
Q
  1. 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

21
Q
  1. What action is required if a red “REV UNLOCK” CAS message illuminates in
    flight?
A

Reduce power on the affected engine and select the emergency stow switch
to STOW
Maintain a maximum airspeed of 200 KCAS

22
Q
  1. How is the auxiliary hydraulic pump powered?
A

By using DC power through the battery tie bus

23
Q
  1. How can the utility hydraulic system be actuated?
A

Manually by the pilot

Automatically in the event of a combined hydraulic failure

GulfStream IV serial # 1214-subsequent (17 decks)

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