Fuel System

Question 1

APU Fuel Feed

Answer 1

An APU fuel pump is provided to start the APU when the main tank pumps are off or normal AC power is unavailable.

Question 2

Automatic Fuel Feed Sequence

Answer 2

• Is fully automatic
• with fuel in all tanks, the center tank
  Pumps provide feed to the engines
• wing tank pumps operate continuously
  and are fitted with “Pressure Relief
  Sequencing Valves” to ensure that the
  center tank pumps, when running, have
  preferential priority.

Question 3

When do the wing transfer valves open

Answer 3

When either wing inner compartment fuel quantity decreases below 1650 pounds

Question 4

When do engine low pressure valves colse

Answer 4

Engine masters with is turned off

When engine fire switch is released

Question 5

How does suction feed work

Answer 5

Suction valves in each inner wing tank are closed when boost pump pressure is normal. They open when pump pressure is low, allowing the engines to be gravity fed from the wing tanks only.

Question 6

In flight, with fuel MODE SEL in AUTO and fuel in the center tank, the center tank pumps

Answer 6

Run only if slats are retracted

Question 7

In flight, with the MODE SEL in MAN, and the CTR TK pumps ON, what is the effect on the center tank pumps?

Answer 7

The center tank pumps run continuously until turned off with the CTR TK pump switches.

Question 8

A fuel pump FAULT light indicates

Answer 8

Fuel pump low fuel pressure

Question 9

Resetting tripped wing tank fuel boost pump circuit breaker is prohibited.

Answer 9

At all times

Question 10

A fuel MODE SEL FAULT light indicates

Answer 10

Center tank has more than 550 pounds of fuel and the left or right wing tank has less than 11,000 pounds

Question 11

The cross feed valve is normally in the ____________ position

Answer 11

Closed

Question 12

What do the double dashes ver the last two digits of the fuel on board (FOB) indication mean

Answer 12

The fuel quantity indication is still operative, but inaccurate

Question 13

What would cause an amber half box to appear around the E/WD FOB display when the fuel quantity is not fully usable?

Answer 13

Both transfer valves on the side fail to open

Question 14

Engines can gravity feed from

Answer 14

The wing tanks only

Question 15

The over-pressure burst disk will rupture if

Answer 15

The internal and external pressure differential exceeds a predetermined value

Question 16

If a fuel imbalance greater than 3300 pounds is detected, indications of the wing inner and outer tanks with the highest fuel level will

Answer 16

Pulse Green

Question 17

A low level fuel warning may be triggered during steep decent, acceleration or deceleration. The transfer valves may ___________
With more than ________________ pounds of fuel in one of the inner fuel tanks

Answer 17

OPEN

1650 Pounds

Question 18

When either inner wing compartment fuel quantity reaches

______________ pounds. At least one transfer valve in each wing opens

Answer 18

1650 pounds

Question 19

The fuel recirculation system uses fuel for

Answer 19

IDG Cooling

Question 20

IDG heat exchanger return fuel is routed to the fuel return valve and then to the

Answer 20

Wing tank outer compartments

Question 21

When fuel is supplied from the center tank, and recirculated fuel has filled the wing tank, the center tank pump shuts off until _______________ pounds of fuel has been burned out of the wing tanks

Answer 21

1100 pounds