E190 - Fuel

Question 1

What happens if you turn the XFEED selector to LOW2 ?

Answer 1

• Opens the X-feed valve- Activates AC pump 1

Question 2

What does an amber dashed fuel flow line mean ?

Answer 2

The associated flow line pressure is undetermined.

Question 3

What is the purpose of the fuel vent system ?

Answer 3

To ensure that differential pressure between the tank and the environment remains within limits, and to prevent fuel spillage.Each fuel tank is vented through a vent tank in the outboard of the wing.

Question 4

How is the fuel tank protected from over-pressurization ?

Answer 4

By the pressure relief valve.

Question 5

How is water eliminated in the fuel tank ?

Answer 5

The water drain valve collects water by gravity.

Question 6

How is the low fuel-condition detected ?At which quantity is it triggered ?

Answer 6

By an independent fuel low-level sensor in the collector tank.It is triggered at 400 kg.

Question 7

What is the fuel quantity uncertainty ?

Answer 7

0,75% of the tank capacity+2% of the indicated fuel quantity

Question 8

What is the maximum fuel quantity ?

Answer 8

2 x 6,55 tons = 13,1 tons(depending on density)

Question 9

When are the AC fuel pumps used ?

Answer 9

• Backup in case of ejector pump failure- During engine start (also x-feed)
• APU (when engine is not running)

Question 10

By which busses are the AC pumps powered ?

Answer 10

AC pump 1 = AC BUS 2AC pump 2 = AC ESS BUS

Question 11

How is the level in the collector tank maintained ?

Answer 11

By three scavenge ejector pumps.

Question 12

What is the purpose of the DC fuel pump ?Where is it installed ?

Answer 12

It is installed in the right wing tank. It provides fuel for normal APU operation and engine start, when AC power of the AC fuel pump is not available. It is installed on the eng 2 fuel feed-side.

Question 13

The DC fuel pump is powered by which bus ?Can it be used in flight ?

Answer 13

It is powered by DC ESS BUS 2.Yes, tt can be used in flight or on the ground.

Question 14

How is fuel transferred using the X-feed ?

Answer 14

The x-feed valve opens and the opposite AC pump is energized to feed fuel from that wing tank to both engines.

Question 15

When does the FUEL IMBALANCE message appear? When does it disappear ?

Answer 15

When the difference is > 360 kg.It disappears < 45 kg.

Question 16

What is the only situation where the engine fuel shutoff valves close ?

Answer 16

If you pull the engine fire handles.

Question 17

How is the fuel quantity measured ?

Answer 17

By electrical sensors.Dripsticks (6 in total) provide an alternate means.

Question 18

What happens if any scavenge pump (transfer system ) fails ?What is the risk ?

Answer 18

The fuel inside the collector tank will level with the rest of the tank, thus triggering a LO FUEL warning. This can occur even if there is up to 2800 kgs in the respective tank. Indicated fuel quantity is still correct.Engine flameout may occur at pitch attitudes > 15deg nose up OR down, uncoordinated maneuvers or negative G’s.

Question 19

In case of an electrical emergency (RAT deployed), which AC fuel pump is still available ?

Answer 19

AC pump 2 (AC ESS BUS)

Question 20

Is refuelling possible with APU not running or no AC power connected ?

Answer 20

Yes, by selecting BATTERY on the refuelling panel.

Question 21

What does the ENG 1 FUEL SOV FAIL msg mean ?

Answer 21

The shutoff valve is not in the commanded position.

Question 22

Is it possible that FUEL 1/2 LO LEVEL msg occurs when flying with high pitch and/or bank angles ?

Answer 22

Yes.

Question 23

What is the meaning of the FUEL FEED 1(2) FAULT msg ?

Answer 23

Respective backup AC pump is on due to failure of the main engine fuel feed system.