EMB120 Fuel System

Question 1

What kind of fuel tanks does the aircraft have?

Answer 1

Wet tanks

Question 2

How can we fuel the plane?

Answer 2

Pressure fueling or over the wing

Question 3

How many tanks are in each wing?

Answer 3

Each wing has 2 Tanks, an outboard and inboard. The tanks are interconnected by a fuel duct that is gravity fed making the two tanks act as a single reservoir.

Question 4

Does the aircraft need electricity to pressure fuel?

Answer 4

No but is recommended

Question 5

How is the fuel heated?

Answer 5

Oil

Question 6

What does the Transfer jet pump do?

Answer 6

operated by motive flow, Their
purpose is to keep the collector tank at a level sufficient to provide a constant source of fuel for the main jet pump and the electric boost pumps. When operating, the transfer jet pumps increase the usable fuel by taking fuel from the lowest portions of the inboard tank and transferring it into the collector tank. When the transfer jet pumps are not operating, usable fuel in the corresponding wing tank is reduced by 79.6 lb (12.15 US gallons).

Question 7

How much does the unusable fuel increase by when cross feed is open?

Answer 7

79.6lbs

Question 8

How any filters does the system have and where are they located?

Answer 8

2 filters a side, one in the high pressure pump and one in the low pressure pump

Question 9

what is the max fuel the dripless stick will read?

Answer 9

2238lbs

Question 10

How any fuel pumps are in each wing?

Answer 10

5 pumps
1 main jet pump
2 electrical driven pumps
2 transfer jet pumps

Question 11

What is the capacity of each fuel tank? Total capacity?

Answer 11

Each wing can hold 437 usable gallons (2866lbs)

Total capacity is 874 Gallons (5732lbs)

Question 12

Where does the collector tank reside?

Answer 12

the lowers point in the inboard tank

Question 13

Where are the main Jet pumps and electrical boost pumps located?

Answer 13

in the collector tank

Question 14

Where is fuel for the APU supplied from?

Answer 14

The right wing tank

Question 15

What powers the jet pumps (venturi)?

Answer 15

Fuel under pressure supplied by the high pressure engine fuel pump through a bypass on the HMU

Question 16

When are the electric fuel pumps used?

Answer 16

Engine start
Cross feeding
Main jet pump failure

Question 17

What indicates a loss of motive flow?

Answer 17

by the electric boost pumps cycling on and off (in AUTO), alternating with the LOW PRESS lights on the overhead FUEL panel

Question 18

if Jet transfer pump fails how much does the unusable fuel increase by?

Answer 18

79.6lbs in corresponding tank

Question 19

How is fuel quantity measured?

Answer 19

Quantity transmitters send signals to the master quantity indicators. This system is capacitance type system

Fuel can also be measure by magnetic dripless measuring stick

Question 20

What happens to the fuel totalizator if power is lost or signal failure occurs?

Answer 20

The display will go blank

Question 21

What does the main jet pump do?

Answer 21

Supplies fuel to the engine from the collector tank

Question 22

Where does motive flow get fuel from?

Answer 22

HMU return

Question 23

What does opening the cross feed valves do?

Answer 23

Closes the motive flow valves

Question 24

Where does any unused fuel get sent?

Answer 24

Surge tank