Fuel System

Question 1

Where is the fuel stored?

Answer 1

Two wing tanks.

Question 2

How many pumps are found in each tank and what are they called?

Answer 2

Three per tank, Six total.

1. one ejector pump
2. one scavenge ejector pump
3. one DC boost pump

Question 3

What is normally used to supply fuel from the wing to the engine fuel control unit in flight?

Answer 3

Main ejector pumps

Question 4

How are the primary fuel and scavenge ejector pumps powered?

Answer 4

Motive flow from the respective engine.

Question 5

What is the primary purpose of the scavenge jet pump?

Answer 5

Maintains the fuel level in the collector tank ensuring a constant flow of fuel to the engine during normal flight.

Question 6

When is the electric fuel pump activated if in the auto position?
(3)

Answer 6

1. Engine start
2. Crossfeed operation
3. Primary ejector pump failure (low pressure)

Question 7

What ensures that the differential pressure between the tank and ambient remains within structural limits and prevents fuel spillage?

Answer 7

A vent system including a NACA air inlet/outlet, located on the lower surface of the wing below the surge tank.

Question 8

How is crossfeeding performed?

Answer 8

Select the XFEED switch to the wing tank with the low fuel quantity (LO 1 or LO 2).

This opens the XFEED valve and turns on the electric DC pump in the wing tank with the highest level of fuel. Both engines will utilize fuel from that tank.

Question 9

What is the restriction on crossfeed operation?

Answer 9

Shall not be performed during takeoff and landing.

Question 10

When fuel becomes balanced and the XFEED valve is still open, what CAS message will be annunciated?

Answer 10

“FUEL EQUAL”

Question 11

Will the total tank quantity indication be lost if only one wing tank quantity indicator fails?

Answer 11

Yes

Question 12

The fuel shutoff valves are normally open. What is the only way to close one of these valves?

Answer 12

By pushing the fire shutoff pushbutton.

Question 13

What would cause a “FUEL LO LEVEL” CAS message?

Answer 13

310 lbs of fuel remaining in the respective tank.

Question 14

What would cause a “FUEL IMBALANCE” CAS message?

Answer 14

Imbalance of 220 lbs or greater. CAS remains illuminated until imbalance is below 88 lbs.

Question 15

Is there de-fueling capability?

Answer 15

Yes, by means of a dump valve located under each wing.

Question 16

While fueling, what monitors the fuel quantity in the tanks and controls refueling flow into each tank?

Answer 16

EFCU, Electronic Fuel Control Unit.

Question 17

How long is maximum refueling time from empty to full?

Answer 17

Less than 12 min, at 50 psig.

Question 18

Explain the two critical tests that should be accomplished on the control panel before re-fueling begins?

Answer 18

Lamp Test and Shut-Off Test

Question 19

What action is necessary to accomplish on the refueling panel if external power is not being utilized?

Answer 19

The POWER SWITCH must be selected to BATT.

Question 20

Fuel Temp is taken from where?

Answer 20

Right Wing

Question 21

What are the three sections of each wing tank?

Answer 21

• Main tank
• Collector tank
• Surge tank

Question 22

What Jet fuel types are approved?

Answer 22

• Jet A
• Jet A-1
• JP8

Question 23

How can a DC Aux pump be operated manually?

Answer 23

Select the respective DC pump to the ON position.

Question 24

Cana DC Aux pump operate with the respective pump switch in the OFF position?

Answer 24

No

Question 25

What is indicated by the White Fuel Equal CAS?

Answer 25

Fuel imbalance is less than 44 lbs.

Question 26

How many fuel quantity sensors are installed in each wing?

Answer 26

4 per wing.