Exam Review: AVIATION FUEL Flashcards
What are the 2 types of Aviation Fuel?
AVGAS
JET FUEL
Heavy hydrocarbons make what?
JET FUEL
DIESEL
Where do we use AVGAS?
Piston engines
Which fuel is more VOLATILE and FLAMMABLE?
AVGAS
The tendency of a liquid to turn into a vapor is called what?
VOLATILITY
How does VAPORIZATION increase?
pressure decrease
temperature increase
How do we measure the volatility of the fuel?
REID VAPOUR PRESSURE TESTER
What are the 3 problems with AVGAS?
VAPOR LOCK
CARB ICING
DETONATION
Fuel vaporization before the air stream is called what?
VAPOUR LOCK
How does VAPOUR LOCK occur?
Low fuel pressure
high fuel temp
excessive fuel turbulence
How do we prevent VAPOUR LOCK?
Less heat, sharp bends, steep rises
BOOST PUMPS
VAPOUR ELIMINATOR
This problem mostly occurs in the venturi throat or throttle valve and is related to vapourization
CARB ICING
CARB ICING causes what?
Loss of power
engine stoppage
How do we prevent CARB ICING?
Carb heat
Air inlet heat
What is DETONATION?
Detonation of fuel due to high pressure and temperature prior to ignition
What will indicate DETONATION?
Knock
CHT temp rise
Engine power loss
How do we prevent DETONATION?
Increase OCTANE RATING
How do we increase the OCTANE RATING?
Add TETRAETHYL LEAD
What are the 3 grades of AVGAS and what are their colours?
80/87 Red
100/130 Green
100LL Blue
The first number 100/130 indicates what?
Lean mixture (burns hotter)
What are the 3 types of TURBINE FUELS?
JET A
JET A1
JET B
Which JET FUEL is a kerosene/gasoline blend?
JET B
Which fuel would we need for cold starts and aerial restarts?
JET B (high volatility)
What are the problems with TURBINE FUELS?
Water
Microorganisms
What are the 2 types of water found in the fuel system?
Dissolved
Free (removable)
What do we use HOT BLEED AIR and ENGINE OIL for?
Prevents ice crystals
How do we prevent ALGAE and ice crystals?
ADDITIVES
