Fuel system

Question 1

How many electric boost pumps does the EMB-145 have

Answer 1

6: three each wing

Question 2

When is it required that at least one electric fuel pump must be operating

Answer 2

During takeoff and go around

Question 3

What is the purpose of the fuel pump selector?

Answer 3

To select either pump A, B, or C as the operating pump

Question 4

What will happen if the electric driven fuel pump pressure drop below 6.5 psi on the inlet side of the FPMU?

Answer 4

An EICAS message caution E1(2) FUEL LO PRESS may illuminate

The remaining pumps will automatically cycle on and off until the pilot selects another pump on the overhead panel

Question 5

Which buses power the different electric fuel pumps

Answer 5

Fuel pump A is powered by onside essential bus, fuel pump B is powered by offside, essential bus, and fuel pump C is powered by onside main DC buses

Question 6

What is the purpose of the collector box near the wing root?

Answer 6

To keep the electric pump inlets submerged at all times

Question 7

What powers the transfer ejector pumps

Answer 7

Motive flow fuel pressure

Question 8

What is the purpose of the transfer ejector pump?

Answer 8

To keep the collector box filled

Question 9

What are the pressure limits for pressure refueling?

Answer 9

35 to 50 psi

Question 10

Can pressurize refueling be performed solely on battery power

Answer 10

Yes, although it is normal to do it with the aircraft energized

Question 11

How many measuring sticks does the EMB – 145LR have on each side

Answer 11

Three

Question 12

What is the purpose of the crossfeed selector?

Answer 12

To transfer fuel from one wing to the opposite side engine

Question 13

To which side should the crossfeed switch be set for fuel crossfeed operation?

Answer 13

 the crossfeed switch should be selected to the lower side

Question 14

Does Crossfeed operation allow fuel transfer between wing tanks?

Answer 14

No

Question 15

How must the X–FEED selector be set during takeoff and go around

Answer 15

Off

Question 16

What message would alert the crew to the fuel crossfeed valve being fully open?

Answer 16

Fuel cross-feed open advisory message on the EICAS

Question 17

In which tank is the fuel low temperature sensor located?

Answer 17

Left

Question 18

The FUEL IMBALANCE EICAS message will occur when one tank differs by how much from the other tank

Answer 18

800lbs. The message will disappear when the difference decreases below 100 pounds.

Question 19

What is the minimum temperature for fuel leaving the FCOC if the fuel does not contain an icy inhibitor

Answer 19

It must be above 4°C

Question 20

How does the crew know whether this condition (minimum temperature for fuel leaving the FOC if the fuel does not contain an icing inhibitor) is met or not

Answer 20

EICAS message E1(2) FUEL LOW TEMP is shown if it is not met

Question 21

What are the components of the wing fuel tank vent system?

Answer 21

Float vent valves, vent lines, a surge box, and a NACA air intake

Question 22

What is the purpose of the wing tank vent system?

Answer 22

To prevent damage to the wings from excessive positive or negative pressures in the tanks

Question 23

What is the maximum usable fuel capacity for each wing tank?

Answer 23

5717 pounds

Question 24

What is the maximum fuel tank temperature?

Answer 24

52

Question 25

What is the minimum fuel tank temperature?

Answer 25

-40°C