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at354 hawker ground > Hydraulics/Fuel > Flashcards

Hydraulics/Fuel Flashcards

1
Q

BTFANGS

A

Brakes
Thrust Reversers
Flaps
Airbrakes
Nosewheel Steering
Gear
Stick Pusher

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2
Q

What are the three different pumps in the hydraulic system?

A

Two variable volume, engine driven pumps, auxiliary pump, and ground hand pump

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3
Q

Is one engine driven pump enough to power all systems?

A

Yes

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4
Q

What can the auxiliary pump do?

A

Lower the gear and operate the flaps

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5
Q

How is the auxiliary pump actuated?

A

Hand pump in the cockpit

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6
Q

How big is the auxiliary hydraulic reservoir?

A

6 pints

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7
Q

What is the ground hand pump?

A

Located in rear equipment bay, creates hydraulic pressure on the ground

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8
Q

How big is the main hydraulic reservoir?

A

2.4 gallons

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9
Q

What closes the on-off hydraulic valve?

A

The HP COCK lever

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10
Q

What is the purpose of hydraulic accumulators?

A

Ensure constant hydraulic flow through a pressure storage system to the associated subsystem

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11
Q

What does the HYD OVHT annunciator indicate, and when does it illuminate?

A

Indicates an overheat condition of the hydraulic system when fluid temp exceeds 90°C

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12
Q

What does the HYD 1/2 LO PRESS annunciator indicate?

A

Low pressure condition

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13
Q

When does the HYD 1/2 LO PRESS annunciator extinguish?

A

1,750 psi

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14
Q

When does the HYD 1/2 LO PRESS annunciator illuminate?

A

1,500 psi after 57 seconds

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15
Q

What is normal hydraulic system pressure?

A

3,000 psi

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16
Q

When does the hydraulic overpressure relief valve open? What does it do?

A

Opens at 4,000 psi, returning fluid to reservoir

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17
Q

What happens if both engine-driven hydraulic pumps fail?

A

Pressure-maintaining valve closes to provide 2,300 psi pressure for brake operations

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18
Q

What is the main accumulator pressure?

A

1,000 psi

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19
Q

What is the wheel brake accumulator pressure?

A

1,000 psi

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20
Q

What is the thrust reverser accumulator pressure?

A

1,500 psi

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21
Q

What does the AUX HYD LO LEVEL annunciator indicate?

A

Auxiliary tank has decreased by 1/2 pint

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22
Q

How is hydraulic fluid level checked?

A

Sight gauge in the aft equipment bay

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23
Q

Where are the fuel tanks on the Hawker 900XP?

A

Left and right integral wing tanks, additional ventral tank

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24
Q

What are the three types of fuel pumps onboard?

A

Jet pumps, boost pumps, and engine-driven pumps

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25
Q

What are the fuel jet pumps?

A

Motive-flow, non-moving pumps that push fuel from outboard the wing to the inboard central fuel compartment

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26
Q

What are the fuel electric boost pumps?

A

One in each wing tank, delivers fuel under pressure to the engine-driven pumps and provide the motive flow to the jet pumps in the fuel system

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27
Q

What are the engine-driven fuel pumps?

A

Attached to the accessory case and atomizes the fuel for combustion

28
Q

During normal operations, what are the fuel boost pump switches set to?

A

ON

29
Q

What happens when the electric boost pump switches are set to OFF?

A

Electric boost pumps turned off

30
Q

What does setting the fuel boost pump switches to EMERG do?

A

The electric boost pumps are powered by the PE bus

31
Q

What buses power the electric boost pumps?

A

Left - PS1, Right - PS2

32
Q

What is total fuel capacity of the 900XP?

A

10,000 lbs (8,500 lbs in wings, 1,500 lbs in ventral tank)

33
Q

How is fuel normally distributed on the 900XP?

A

Jet pumps draw fuel into the #1 tank compartment, then the electric boost pumps deliver fuel under pressure to the same-side engine via the LP fuel cocks

34
Q

What happens when the AUX FUEL TRANSFER lever is set to transfer?

A

With both boost pumps operating: ventral fuel transfers to both wings evenly

With one boost pump operating: ventral fuel transfers to side with operating boost pump

35
Q

What happens if both boost pumps fail?

A

Fuel gravity feeds into the #1 compartment and is suctioned out by engine-driven fuel pump - ventral fuel not available

36
Q

Where does the APU get fuel?

A

Left wing tank

37
Q

What happens if the WING FUEL lever is set to the XFEED position?

A

Fuel from wing tanks are available to either engine

38
Q

What happens if the WING FUEL lever is set to the TRANSFER position?

A

Opens the wing transfer valve and fuel will move to the side with the operating boost pump

39
Q

What do the LP cocks control?

A

Low pressure fuel valves (one in each engine supply line, can isolate the engine fuel feed lines from the fuel tanks)

40
Q

What do the HP cocks control?

A

The fuel valve at the engines

41
Q

What does the FUEL 1/2 LO PRESS annunciator indicate, and when does it illuminate?

A

Indicates a low pressure condition when pressure in the engine fuel line falls below 7 psi

42
Q

What does the AUX FUEL TFR annunciator indicate?

A

Illuminates when the AUX FUEL TRANSFER lever is moved to the open position

43
Q

What does the REFUEL ON annunciator indicate?

A

Any refuel valve is open

44
Q

What does the WING FUEL XFD/TFR annunciator indicate?

A

Illuminates when the WING FUEL XFEED TRANSFER lever is moved out of the closed position - in the TRANSFER position, the light flashes

45
Q

Where is the fuel quantity read?

A

Right-side MFD, given in pounds

46
Q

How does the ventral fuel quantity display?

A

FULL, EMPTY, or hatch marks when in between conditions

47
Q

What is the maximum wing fuel imbalance?

A

500 lbs

48
Q

What is the max wing fuel in order to transfer ventral fuel to wings?

A

3,300 lbs per side

49
Q

What is the minimum wing fuel with fuel in the ventral tank?

A

3,450 lbs per side

50
Q

What is maximum ventral tank capacity?

A

1,500 lbs

51
Q

What is maximum wing tank capacity?

A

4,250 lbs per side

52
Q

If one hydraulic engine-driven pump fails:

A

The hydraulic pressure indicator will display 3,000 psi, and the applicable low-pressure annunciator will illuminate

53
Q

If both hydraulic engine-driven pumps fail:

A

Indicated pressure is 2,300 psi, and both low-pressure annunciators are illuminated

54
Q

The main hydraulic reservoir is pressurized to prevent:

A

Pump cavitation

55
Q

The first step in operating the auxiliary hydraulic system is to:

A

Pull the AUX HYD SYSTEM lever

56
Q

The purpose of the pressure maintaining valve in the main hydraulic system is:

A

To maintain 2,300 psi in the main accumulator for normal brake operation

57
Q

If one engine-driven hydraulic pump fails:

A

The remaining pump is capable of actuating all subsystems

58
Q

Boost pumps are located in the:

A

Left and right wing tanks

59
Q

There are _______ water drains in the fuel system:

A

Five

60
Q

When the ventral tank contains fuel, a low VMO speed warning will sound whenever aircraft speed exceeds:

A

280 KIAS

61
Q

Total usable fuel capacity is:

A

10,000 lbs

62
Q

The maximum lateral imbalance permitted is:

A

500 lbs

63
Q

With both boost pumps inoperative:

A

Ventral tank fuel cannot be transferred

64
Q

IF the ventral tank is to be used in flight, it must be full, and each wing must contain more than:

A

3,450 lbs of fuel

65
Q

The aircraft fuel system accepts a maximum refueling supply pressure of:

A

50 psi

at354 hawker ground (10 decks)

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