Fuel Systems Flashcards
How tight should a flareless fitting be turned after being finger tightened?
No more than one sixth to one third
What time frame is used to classify the size of a leak?
30 mins
What happens if filters are blocked with ice?
Illuminate a light,
Fuel will heat up melting ice,
Compressor bleed air can be used
Name 3 types of fuel tanks
Integral
Auxiliary
Flexible (Bladder)
What type of tank is made to be fitted or removed?
Auxiliary fuel tanks
What are bladder tanks usually made of and how are they held in place?
Neoprene rubber,
Can snap or click into place or can be laced into the structure.
What must tank caps have attached to them?
Locking device and chain to ensure cap isn’t left unattached.
Define ventilation
When aircraft is refuelled or de fuelled a positive pressure or vacuum is created. Vent system is used to prevent this.
Apart from refuelling and defuelling when else will fuel tanks require a vent system?
When transferring fuel to another tank.
Thermal expansion.
What do fuel tanks have to check quality of fuel on the ground?
Fuel tank drain points
Name 3 fuel quantity indication systems
Float type
Capacitance type
Measuring stick
What can aircraft do to reduce weight inflight Incase of emergency.
Dump fuel,
Jettison fuel
Fuel shut off valves are operated by what
Solenoid
What type of fuel quantity indicator can tell us the mass of fuel?
Capacitance
What is the most common type of coupling found on NZDF aircraft
Wiggins Coupling
What fuel tank consists of part of the aircraft structure.
Integral
All fuel tank systems should contain a drain to perform what function?
Fuel drain, fuel quality checks
What happens when a fuel filter gets clogged?
Warning light to indicate clogging, bypass
What are the 4 classifications of a leak.
Slow seep (stain)
Seep
Heavy seep
Running leak
How can you identify if a flexible hose has been twisted?
Lay line will be twisted
Define volatility
The measure of a liquids tendency to vaporise under certain conditions.
What three operations are electric boost pumps used for?
Supply fuel pressure for starting engine.
Back up Incase engine driven pump fails.
Assures fuel flow switching from one tank to another.
What is built around a fuel pump to prevent movement of fuel away from booster pump
Surge box
Baffles
What is an integral fuel tank defined as.
Primary aircraft structure, usually a aircraft wing or fuselage, sealed to contain fuel.
Two forms of water in fuel.
Dissolved and free
In centrifugal boost pumps what stirs up the fuel drawn into the impellers
Agitator, allows big air bubble to go to surface
Contaminated fuels greatest danger
Contamination resulting from human error.
