Everything Flashcards
(31 cards)
Define volatility
The tendency of a liquid to vaporize under certain conditions
What are the two forms of water contamination
Free water
Dissolved
Describe what dissolved and free water will do to an engine
Dissolved water will not effect the engine as most can tolerate it
Free water is a problem and can servely affect engine performance
What do fuels use to reduce risk of water contamination
Anti icing additives
Freezing water is a problem in fuel lines. State some methods of reducing this
Heating components eg. Filters by compressed air, or oil heating.
Fuel heaters to keep fuel at optimal temperature
State second degree of contamination from water
Microbial corrosion in fuel tanks
How can water be detected in a fuel system
Taking regular samples from tanks and visually examination for contamination
Name 3 types of fuel tanks
Auxiliary
Integral
Bladder/flexible
State the advantage of integral tanks
They use maximum space while having the minimum amount of weight
Define a integral fuel tank
Primary aircraft structure usually a wing or fuselage which is sealed to contain fuel
Pro of aux tanks
Task orientated, therefore they are readily removed or fitted. And can also be jettisoned in emergancys
What material are bladder tanks made from and how are they fitted
Neoprene rubber and are stuffed into cavities to then be attached by lacing or snapping into place
Bladder tank inspections
For correct fitment/ attachment
Fuel tank integrity
State 2 must haves with a fuel cap
Locking device
Chain so not left unattached
Prior to fitting a fuel cap you need…
A progressive inspection
Outline the purpose of a surge box
To keep fuel from flowing away from booster pump
What are baffle plates used for
To stop fuel surging in tanks
Why do we need ventilation in fuel tanks
To avoid catastrophic failure from negative or positive pressure during:
Refuel/defuel
Expansion/contraction (thermal)
Burning fuel during flight
Why fuel tanks need drain valves and where are they located
For regular inspections of fuel quality and to drain fuel.
Located at sump/lowest part of tank
What is the purpose of dumping fuel
Incase of emergency landing, need to reduce weight and possibility of fire
3 types of fuel indication systems
Float
Capacitance
Measuring stick
(Optical is a 4th found on NH90)
What fuel indicating system can measure mass
Capacitance.
Uses the difference in dielectric values that change the Capacitance to measure quantity
State purpose of fuel system
To provide a reliable supply of clean duel to the engines to meet their specific requirements
3 types of fuel shut off valves
Hand operated
Motor operated
Solenoid operated
