Fuel

Question 1

What system allow transfer from outer to inner ?

Answer 1

2 electric transfer valves mounted on each wings

Question 2

When will the transfer valves actives automatically ?

Answer 2

when fuel in the inner tank reach 750Kg in each wings

Question 3

Which valve control the fuel supply to the ENG ? and when will it close ?

Answer 3

the Low pressure fuel valve
ENG Fire PB and Master switch

Question 4

Can you gravity feed from the center tank ?

Answer 4

no

Question 5

What is the fuel sequence ?

Answer 5

1 center tank
2 Inner tank down to 750kg
3 outer tank: fuel transfers into the inner tank

Question 6

When will the transfer valve reset closed ?

Answer 6

next refueling

Question 7

What can happen when the center tank are feeding the ENG ? How is this prevented ?

Answer 7

the wing tank can overfill because of the fuel recirculation (IDG cooling) which return some of the fuel to the outer tank.
To prevent that, the system will turn off center tank pump until 500Kg has been used in the inner tank then restart the center tank pumps.

Question 8

What is the fuel recirculation ?

Answer 8

Fuel being used to cool down the IDG.
Once used the fuel will return to the outer tank, if full it will overflow to the inner tank.

Question 9

How is the fuel supplied to the APU ?

Answer 9

Special fuel pumps when fuel feed pressure is low. The fuel is coming from left fuel system.

Question 10

Can refuelling be done on batteries only ?

Answer 10

Have a BATT power toggle switch on the refuelling panel which when on allow refuelling on bat.