Hydraulics/Fuel

Question 1

BTFANGS

Answer 1

Brakes
Thrust Reversers
Flaps
Airbrakes
Nosewheel Steering
Gear
Stick Pusher

Question 2

What are the three different pumps in the hydraulic system?

Answer 2

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

Question 3

Is one engine driven pump enough to power all systems?

Answer 3

Yes

Question 4

What can the auxiliary pump do?

Answer 4

Lower the gear and operate the flaps

Question 5

How is the auxiliary pump actuated?

Answer 5

Hand pump in the cockpit

Question 6

How big is the auxiliary hydraulic reservoir?

Answer 6

6 pints

Question 7

What is the ground hand pump?

Answer 7

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

Question 8

How big is the main hydraulic reservoir?

Answer 8

2.4 gallons

Question 9

What closes the on-off hydraulic valve?

Answer 9

The HP COCK lever

Question 10

What is the purpose of hydraulic accumulators?

Answer 10

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

Question 11

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

Answer 11

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

Question 12

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

Answer 12

Low pressure condition

Question 13

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

Answer 13

1,750 psi

Question 14

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

Answer 14

1,500 psi after 57 seconds

Question 15

What is normal hydraulic system pressure?

Answer 15

3,000 psi

Question 16

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

Answer 16

Opens at 4,000 psi, returning fluid to reservoir

Question 17

What happens if both engine-driven hydraulic pumps fail?

Answer 17

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

Question 18

What is the main accumulator pressure?

Answer 18

1,000 psi

Question 19

What is the wheel brake accumulator pressure?

Answer 19

1,000 psi

Question 20

What is the thrust reverser accumulator pressure?

Answer 20

1,500 psi

Question 21

What does the AUX HYD LO LEVEL annunciator indicate?

Answer 21

Auxiliary tank has decreased by 1/2 pint

Question 22

How is hydraulic fluid level checked?

Answer 22

Sight gauge in the aft equipment bay

Question 23

Where are the fuel tanks on the Hawker 900XP?

Answer 23

Left and right integral wing tanks, additional ventral tank

Question 24

What are the three types of fuel pumps onboard?

Answer 24

Jet pumps, boost pumps, and engine-driven pumps

Question 25

What are the fuel jet pumps?

Answer 25

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

Question 26

What are the fuel electric boost pumps?

Answer 26

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

Question 27

What are the engine-driven fuel pumps?

Answer 27

Attached to the accessory case and atomizes the fuel for combustion

Question 28

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

Answer 28

ON

Question 29

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

Answer 29

Electric boost pumps turned off

Question 30

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

Answer 30

The electric boost pumps are powered by the PE bus

Question 31

What buses power the electric boost pumps?

Answer 31

Left - PS1, Right - PS2

Question 32

What is total fuel capacity of the 900XP?

Answer 32

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

Question 33

How is fuel normally distributed on the 900XP?

Answer 33

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

Question 34

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

Answer 34

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

Question 35

What happens if both boost pumps fail?

Answer 35

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

Question 36

Where does the APU get fuel?

Answer 36

Left wing tank

Question 37

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

Answer 37

Fuel from wing tanks are available to either engine

Question 38

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

Answer 38

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

Question 39

What do the LP cocks control?

Answer 39

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

Question 40

What do the HP cocks control?

Answer 40

The fuel valve at the engines

Question 41

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

Answer 41

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

Question 42

What does the AUX FUEL TFR annunciator indicate?

Answer 42

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

Question 43

What does the REFUEL ON annunciator indicate?

Answer 43

Any refuel valve is open

Question 44

What does the WING FUEL XFD/TFR annunciator indicate?

Answer 44

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

Question 45

Where is the fuel quantity read?

Answer 45

Right-side MFD, given in pounds

Question 46

How does the ventral fuel quantity display?

Answer 46

FULL, EMPTY, or hatch marks when in between conditions

Question 47

What is the maximum wing fuel imbalance?

Answer 47

500 lbs

Question 48

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

Answer 48

3,300 lbs per side

Question 49

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

Answer 49

3,450 lbs per side

Question 50

What is maximum ventral tank capacity?

Answer 50

1,500 lbs

Question 51

What is maximum wing tank capacity?

Answer 51

4,250 lbs per side

Question 52

If one hydraulic engine-driven pump fails:

Answer 52

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

Question 53

If both hydraulic engine-driven pumps fail:

Answer 53

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

Question 54

The main hydraulic reservoir is pressurized to prevent:

Answer 54

Pump cavitation

Question 55

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

Answer 55

Pull the AUX HYD SYSTEM lever

Question 56

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

Answer 56

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

Question 57

If one engine-driven hydraulic pump fails:

Answer 57

The remaining pump is capable of actuating all subsystems

Question 58

Boost pumps are located in the:

Answer 58

Left and right wing tanks

Question 59

There are _______ water drains in the fuel system:

Answer 59

Five

Question 60

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

Answer 60

280 KIAS

Question 61

Total usable fuel capacity is:

Answer 61

10,000 lbs

Question 62

The maximum lateral imbalance permitted is:

Answer 62

500 lbs

Question 63

With both boost pumps inoperative:

Answer 63

Ventral tank fuel cannot be transferred

Question 64

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

Answer 64

3,450 lbs of fuel

Question 65

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

Answer 65

50 psi