Cap 13 Fuel System Flashcards
Fuel tank construction
~integral tank»interior structure of the wing
~flexaxible tank»rubberished fabric material and are attached to the structure using chords or buttons.
~drum tank»rigid tank made from aluminium
Tank construction
~rigid»alluminium ,no part of structure
~felxibile»rubber,disadvantages can trap water and fuel
~integral»_space;uses inside the wings
Cs25 require 2% expansion space
Fuel tank inerting
~nitrogen is introduced into the fuel tanks
~nitrogen displaces the air
~reduce the tisk of fuel explosion
FAA»mandated all a/c must have a feul inerting
Easa»_space;is scoisidering
Calorific value of the fuel can give how much energy contains
Avgas100LL»died blue,specific gravity 0.72,realtivie low lead lead
avgas100»died green,specific gravity 0.72,high lead content, same octane as avgas100ll
JetA»sg0.8,,freezing/waxing poiny -40
JetA1» sg0.8,freezing point -47
Both Higher flash point and fire point
Wide cut fuel JET B
Low freezing point -60
Lower flash point makes it danger
Turbine fuel may have additives to reduce icing or fungal growth
Fuel colour. Decal
~avgas100»green»_space;. Green/red
~avgas100ll»blue». Blue /red
~JETA»_space;colourless or straw». Black/balck jeta
~JETA1» colourless or straw». Grey/back jeta1
~jetB»_space;colourless or straw». Yellow/black jetB
A collector box with one way flop tubes or check valves ensures a constant supply of fuel even when the a/c is manoeuvring
Drain valve s at the bottom of the tank allow water to be drained
The engines does not draw fuel from the lowest point in the tank
Ensures sludge,water or other contamination does not get pecked up
~high mounted wings»gravity fed,after the fuel filter the fuel passes to he enigne driven pump
~low wings»_space;eleictrically powered booster pump draws fuel through a filter and supplies at a constant pressure
Vapour lock
Bubbles of vapour can interfere with fuel flow
Is a most typically a problem of gravity fed fuel systems
Fuel Gauges
~gallons
~us gallons
~litres
Pressurised fuel tanks
Some a/c may be pressureides fuel tanks,using ram air or pump,this helps force down the fuel into the eniges.
Vent excess relief the pressure