Fuel System Learjet 45XL (3/18/2024)

Question 1

Fuel is stored in what three places?

Answer 1

Left wing, right wing, fuselage

Question 2

Fuselage tank automatically feeds wing tanks via _____________ and ____ ________

Answer 2

gravity/jet pumps

Question 3

Wings tanks can only be filled by _____________ ______________ or ______________ _______________

Answer 3

single point/gravity transfer

Question 4

No electrical power is required to _________

Answer 4

Fuel

Question 5

Power is needed to __________

Answer 5

Defuel
Power is needed at start and stop of defueling, but not during.

Question 6

Can you refuel with engines running?

Answer 6

NO

Question 7

Can you refuel with APU running?

Answer 7

Yes, only single point refuel

Question 8

What are prohibited fuels?

Answer 8

Jet B, JP4, Avgas (100LL)

Question 9

Fuel are the capacities (Left tank, right tank, fuselage, total) (gallons)

Answer 9

250, 250, 404, 904

Question 10

Why is no prist required?

Answer 10

The Lear 45 has a fuel/oil heater

Question 11

What type of tank is the fuselage?

Answer 11

It is a single bladder type tank

Question 12

There is ______ crossfeed to engines, only ____________ between wing tanks

Answer 12

NO/transfer

Question 13

How many jet pumps (scavenge pumps) are in each wing?

Answer 13

5 jet pumps and 1 main pump

Question 14

Crossflow is about _____ (lbs per minute)

Answer 14

50

Question 15

Collector tanks in each wing hold _____ gallons

Answer 15

20

Question 16

CAS: LOW BAY

Answer 16

20% low, 16 gallons remaining in the collector tank

Question 17

Max fuel imbalance (lbs)

Answer 17

200 lbs

Question 18

Wing tanks vent expansion to ___________ tank, ___________ tank vents expansion to ___________ vent in the tail

Answer 18

fuselage/fuselage/NACA

Question 19

How many fuel probes are in each wing?

Answer 19

Eight

Question 20

What happens if a fuel probe fails?

Answer 20

The fuel readout in that tank is lost and the total fuel readout is lost.

Question 21

How many exist under the fuselage? Drains? Sumps? Expansion lines?

Answer 21

6/4/2

Question 22

Can you fuel with APU running?

Answer 22

Yes

Question 23

What are the minimum and maximum fuel truck pressures?

Answer 23

20 to 55 psi

Question 24

What is the pressure needed to defuel?

Answer 24

-10 psi

Question 25

How long does it take to fuel?

Answer 25

15 minutes

Question 26

How long does it take to defuel?

Answer 26

45 minutes

Question 27

When must you perform the shutoff test?

Answer 27

Every time you do singe point refueling

Question 28

How long does it take for shutoff test to stop fuel?

Answer 28

4-6 seconds

Question 29

Is power needed for SP refueling?

Answer 29

No

Question 30

DANGER DANGER with defuel

Answer 30

If defuel is selected when refueling, you could damage the fuel system.

Question 31

CAS: LR FUEL QTY LOW (Yellow)

Answer 31

Less than 350 lbs in associated wing tank

Question 32

CAS: LR FUEL PRESS LOW (Red)

Answer 32

Low press to engine fuel pump inlet (less than 1 psi)

Question 33

CAS: FUEL BAY LOW (White)

Answer 33

Collector bay in wing less than 80% full (107 lbs)

Question 34

CAS: FUEL XFLOW (Yellow)

Answer 34

Valve not in selected position

Question 35

CAS: LR FUEL FILTER (Yellow or White)

Answer 35

Filter is bypassed, white in flight, amber on ground

Question 36

CAS: LR FUEL QTY FAULT (White)

Answer 36

Probe malfunction

Question 37

CAS: FUEL XFLO OPEN (White)

Answer 37

Wing crossflow valve open