Fuel Flashcards
what method refuelling can be done from cockpit
automatic pressure refuelling
what does jettison system do
dump fuel in case of emergency
what does spring loaded check valve do in regards to fuel
keep refuelling hose to 90 degrees
what is present on leak monitor if there’s no leak
nothing
freeze and flash point of JET A1
38degrees and -47 degrees
What does the Kirt aluminium gasket do
Bonding to prevent sparks from static charges
What fuel is most common in Europe
Jet A1
Flash point and freezing point of jet a1
38 degrees and -47 degrees
Jet a1 American name
JP1A
Most common fuel used in America
Jet A
Jet A fuel American name
JP1
Jet A flash point and freezing point
38 degrees and -40 degrees
Problem with flying high and fuel
Cause ambient pressure to decrease which causes fuel to vaporise
Jet A and A1 density at 15 degrees
0.81kg/ltr
How is water identified in fuel
Small droplets or water bubbles or milky appearance - suspended
If dissolved it will be invisible
Problems with water in fuel
Ice build up , supports corrosion and erratic fuel quantity indications
Where are fuel tanks located
Aircraft wings
Where are vent surge tanks
Wing tips
What do vent surge tanks do
Make sure fuel is properly vented
Most common fuel tank
Integral tank
Advantage of integral tank
Save weight because parts of structure used as tank walls
What are auxiliary fuel tanks made of
Light metal alloy container
Flexible rubber bladder
What’s used to prevent fuel movement during attitude changes
Dampening devices
What’s the purpose of flap baffle check valve
Movement in one direction
Where are baffle valves located
Entire length of ribs
What does the fuel ventilation system do
Protect aircraft and passengers against dangerous fuel tank vapours
What is used to vent stabiliser tank
Ram air
How do fuel probes measure fuel
Measuring capacitance in probe
System of refuelling from the cockpit
Automatic
Type of valve used to prevent leaks
Spring loaded check valve
When inspecting fuel leak what will you see if it’s working
Nothing
Where is NACA air intake located
Lower wing surface
What is flash point
Lowest temp fuel creates enough vapours for it to become inflamed
How to detect water in fuel
Syringe test cartridge or filter change colour
What do auxiliary tanks do
Tanks in cargo compartment that increase fuel range
How do you seal integral tanks
Fillet seal
How to aces fuel tanks
Access panels
How are fuel tanks ventilated
passing air around the fuel tank, then releasing this
air to atmosphere carrying away fuel leaks and vapour
Purpose of draining tanks
Remove water or maintenance
Two types of drain valve
Direct and indirect
Difference between direct and indirect drain valves
Direct installed at lowers point of tanks
Indirect is not at lowest point
What does water scavenge system do
Removes water collected in tank by sucking into a pump
Purpose of fuel tank vent System
Allows air in fuel tank to escape refuelling and air to come in when fuel is being used
Protects from over and under pressuring
During flight how is air for fuel pressurisation collected
NACA air inlet
2 methods of refuelling
Gravity and pressure
Disadvantage of gravity refuelling
Takes too long and easy to spill
Normal method of refuelling
Pressurised
How quick is pressure refilling happening
50 psi
Method of pressure refuelling
Manual , auto , override
What must be closed to operate refuelling valve switches
Switch guard
How does airbus indicate respective tank is full
Blue light
When is electrical power for the refuelling system supplied
When panel door is open
How is normal refuelling power provided
External power or apu
Purpose of overflow sensors or float switches
Detect fuel over spills from tanks
When is fuel transfer limited
In flight as it changes aircraft centre of gravity
Purpose of fuel scavenge system
Reduce amount of non-usable fuel in tanks
Most common method fuel scavenging
Use of jet pumps
What can the re circulation system do in regards to engine oil and generator oil
Pumped through engine oil cooler this heats up fuel and cools the engine oil
Two methods of defueling
Pressure and suction
How do u pressure defuel
Using tank boost pumps
Output pressure of boost pumps to defuel
25-50psi
How do you suction defuel
Use of a fuel truck / bowser to suck fuel out
Minimum suction required for defueling
10-15psi
How is fuel transfer done
Only manually
What do you need to do after you transfer fuel
Need to balance aircraft after incorrect refuelling or if you need to empty fuel tank for maintenance
What are trim tanks used for
Increase effect of an aircraft in flight which reduces fuel consumption
How does trim tank fuel save
Reduces aerodynamic drag
Who determines centre of gravity
Manufacture at delivery
How much is target centre of gravity
2% foward of certified aft limit of aircraft
Where is jettison panel located
Overhead panel
Two fuel characteristic sensors
Compensator & densitometer
Accuracy of fuel quantity
99%
What’s used to measure fuel temperature
Thermistor
Where is temperature bulb installed
One of the wing tanks at the rear spar
What clothing protects against sparks when entering fuel tank
Cotton tank access clothing
How is safe to work tank achieved
Sufficient ventilation
How many people are required for fuel tank access
2 people or more
What’s not equipt with external filler port
Centre and stabiliser thank
