Fuel

Question 1

What are the fuel tank types?

Answer 1

Two integral wing tanks

Question 2

What is the tank capacity?

Answer 2

Integral tanks - 2500 kg each

Feeder tank - 160 kg each plus an electrically driven fuel pump and a jet pump

Question 3

What is the max fuel imbalance?

Answer 3

730 kg

Question 4

What are the two fuel lines used for?

Answer 4

• cross feed the engines
• refuel the left tank

Question 5

What does the vent system do?

Answer 5

Provides a positive pressure on the fuel in the tanks when the aircraft is pitching and rolling

Each wing tank incorporates a vent surge tank on the end of the wing, with a NACA inlet which provides atmospheric pressure and prevents accumulation of ice

Question 6

What does the float valve do?

Answer 6

Allows fuel to collect into the surge tank

Question 7

How are the tanks refuelled?

Answer 7

Single point refuelling system

Can gravity refuel the aircraft

Refuelling control panel located in the right main landing gear fairing

Can be refuelled in approx 16 minutes

Max pressure for fuelling is 50 psi

Two refuel valves (solenoid controlled) located downstream of the refuel connector control the flow of fuel to each wing tank

Question 8

What will close the refuel valves?

Answer 8

The FQI when the quantity reaches 2500 kg

Level sensors in case of a failure, sensor is submerged when the fuel tank is full

Question 9

How can the aircraft be defuelled?

Answer 9

Using the same single point system, at a pressure of -11 psi

Question 10

What pumps feed the fuel?

Answer 10

Electric pump only used for starting

Once engine is operating the engine fuel feed supplied by the associated jet pump and the electric pump shuts down

Question 11

Where does the fuel flow?

Answer 11

1) through a check valves and out to the low pressure fuel valve
2) through a check valve to a jet transfer pump - pulls fuel from the main tank to refill the feeder tank

Question 12

What happens if the jet pump output drops below 5 psi?

Answer 12

Associated electric pump starts automatically

If it drops below 4 psi illumination if FEED LO PR light

When pressure increases above 8.5 psi the pump will stop 30 seconds later

Question 13

What powers the crossfeed valve?

Answer 13

DC ess bus

Question 14

How many capacitance probes are located in each tank?

Answer 14

Six probes to measure fuel quantity

Question 15

How many capacitance probes are located in each tank?

Answer 15

Six probes to measure fuel quantity

Question 16

How does the FQI system work?

Answer 16

Two channels, one for each tank

Independent of each other

The probes are electrically connected to the associated flight deck FQI

Question 17

How can be fuel be measured in the case of an FQI failure?

Answer 17

On the ground only using the two magnetic level indicators per tank

Accessed through the bottom of the wing tank

Question 18

What does the green RUN light mean?

Answer 18

The electric pump is activated

Question 19

What is the FQI powered by?

Answer 19

The DC ESS bus

If the batteries are off, it is powered by the ground handling bus when the refuel door is opened

Question 20

What is the fuel temp indicator powered by?

Answer 20

DS Bus 1

Question 21

How is the fuel used indication reset?

Answer 21

By pulling the associated fuel used reset knob