11.10 - Fuel Systems

Question 1

Which is the flashpoint of jet A1

Answer 1

38 degrees c

Question 2

What is meant by the term integral tank

Answer 2

The tank is part of the structure

Question 3

What is the purpose of a knit aluminium gasket on a fuel tank access panel

Answer 3

To provide electrical bonding of the access panel

Question 4

Which is the maximum refuelling pressure allowed when carrying out a pressure refuel

Answer 4

50psi

Question 5

What is the purpose of the trim tank

Answer 5

To reduce drag and increase fuel economy

Question 6

Which parameter is measured by fuel quantity probes used for tank gauges

Answer 6

Capacitance

Question 7

What does it look like if water is suspended in fuel

Answer 7

Water can give the fuel a milky appearance

Question 8

Which mode of pressure refuelling can be carried out from the flight deck

Answer 8

Automatic

Question 9

Which fuel is commonly used on commercial aircraft in Europe

Answer 9

Jet A1

Question 10

During an override refuel of a particular tank the override plunger of the solenoid controlled fuel valve is released

Answer 10

The valve will close if the solenoid is de-energised

Question 11

What happens to fuel that enters the fuel tank venting system and is not immediately drained back into its tank

Answer 11

It goes into the vent surge tank and then back into the main tanks when conditions allow

Question 12

How is a fuel leak in an aircraft centre tank indicated

Answer 12

By a leak monitor connected to a drain valve

Question 13

A fuel scavenge system uses jet pumps. When are these jet pumps operated

Answer 13

Whenever the main booster pumps are running

Question 14

A jettison system has an anti-corona discharge nozzles where the fuel leaves the aircraft. What’s the purpose of these nozzles

Answer 14

To ensure that the fuel does not vaporise as it leaves the aircraft

Question 15

Which fuel has a freezing point of -40c

Answer 15

Jet A

Question 16

Where are the fuel tank drain valves located

Answer 16

At the lowest point in the tank

Question 17

Which statement is true regarding fuel tanks venting system

Answer 17

The air pressure in the fuel tanks is kept slightly above ambient pressure to prevent the fuel from vaporising and to ensure positive supply to the booster pumps

Question 18

How is fuel prevented from splashing around inside the wing during flight manoeuvres

Answer 18

The ribs inside the wings have restricted openings that act as baffles

Question 19

What is the fuel temperature measured with

Answer 19

A thermistor

Question 20

How many magnetic level indicators (MLI) are used as a backup to the electrical indication system

Answer 20

The number of MLI’s in a tank varies with its shape

Question 21

What is the preferred method to de fuel an aircraft by 2000kgs

Answer 21

Pressure devil the center tank or inner wing tanks by using the fuel booster pumps

Question 22

What type of valve is used at the refuelling couplings to prevent fuel leaking out of the manifold

Answer 22

Spring loaded check valve

Question 23

Why is a fuel scavenge system used on an aircraft

Answer 23

To reduce the amount of unusable fuel in the tanks

Question 24

When is it permissible to enter a fuel tank without a respirator or a full face mask

Answer 24

If the tank has been monitored using special vapour monitoring equipment

Question 25

Is it possible to gravity refuel the center tank

Answer 25

Gravity refuelling of a center tank is not normally possible

Question 26

When inspecting the leak monitor what would you expect to find if the system is serviceable

Answer 26

Nothing

Question 27

Which are the 2 types of fuel tank drain valves

Answer 27

Direct and indirect

Question 28

What is meant by the flash point of a fuel

Answer 28

It is the lowest temperature at which enough vapour is given off for the fuel to be ignited