11.10 - Fuel Systems Flashcards
Which is the flashpoint of jet A1
38 degrees c
What is meant by the term integral tank
The tank is part of the structure
What is the purpose of a knit aluminium gasket on a fuel tank access panel
To provide electrical bonding of the access panel
Which is the maximum refuelling pressure allowed when carrying out a pressure refuel
50psi
What is the purpose of the trim tank
To reduce drag and increase fuel economy
Which parameter is measured by fuel quantity probes used for tank gauges
Capacitance
What does it look like if water is suspended in fuel
Water can give the fuel a milky appearance
Which mode of pressure refuelling can be carried out from the flight deck
Automatic
Which fuel is commonly used on commercial aircraft in Europe
Jet A1
During an override refuel of a particular tank the override plunger of the solenoid controlled fuel valve is released
The valve will close if the solenoid is de-energised
What happens to fuel that enters the fuel tank venting system and is not immediately drained back into its tank
It goes into the vent surge tank and then back into the main tanks when conditions allow
How is a fuel leak in an aircraft centre tank indicated
By a leak monitor connected to a drain valve
A fuel scavenge system uses jet pumps. When are these jet pumps operated
Whenever the main booster pumps are running
A jettison system has an anti-corona discharge nozzles where the fuel leaves the aircraft. What’s the purpose of these nozzles
To ensure that the fuel does not vaporise as it leaves the aircraft
Which fuel has a freezing point of -40c
Jet A
Where are the fuel tank drain valves located
At the lowest point in the tank
Which statement is true regarding fuel tanks venting system
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
How is fuel prevented from splashing around inside the wing during flight manoeuvres
The ribs inside the wings have restricted openings that act as baffles
What is the fuel temperature measured with
A thermistor
How many magnetic level indicators (MLI) are used as a backup to the electrical indication system
The number of MLI’s in a tank varies with its shape
What is the preferred method to de fuel an aircraft by 2000kgs
Pressure devil the center tank or inner wing tanks by using the fuel booster pumps
What type of valve is used at the refuelling couplings to prevent fuel leaking out of the manifold
Spring loaded check valve
Why is a fuel scavenge system used on an aircraft
To reduce the amount of unusable fuel in the tanks
When is it permissible to enter a fuel tank without a respirator or a full face mask
If the tank has been monitored using special vapour monitoring equipment
Is it possible to gravity refuel the center tank
Gravity refuelling of a center tank is not normally possible
When inspecting the leak monitor what would you expect to find if the system is serviceable
Nothing
Which are the 2 types of fuel tank drain valves
Direct and indirect
What is meant by the flash point of a fuel
It is the lowest temperature at which enough vapour is given off for the fuel to be ignited
