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What are 3 causes of vapor lock in a fuel system?
- High fuel temp
- low fuel pressure
- high fuel turbulence
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AVGAS 80 is what color?
Red
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AVGAS 100 is what color?
green
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AVGAS 100LL is what color?
blue
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Why is lead added to fuel?
acts as an anti-knock
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What color is the marker for Jet A1?
Black with grey stripe
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What color is the marker for Jet B?
black with yellow stripe
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What color is the marker for Jet A?
Black with black stripe
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How heavy is AVGAS on a standard day?
about 6lbs a gallon
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How heavy is Jet A on a standard day?
roughly 7 lbs a gallon
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What is "Flashpoint"?
The temperature that fuel emits ignitable vapours
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Where is fuel information found ?
- AIP or AIM
- Aeronautical Information Publication or manual
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What is the ratio of components that make up Jet B?
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Which is a better lubricant , avgas or jet fuel?
Jet fuel
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True or False. Jet fuel can suspend more water than avgas?
True
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What are 4 types of fuel contamination?
- Water
- Dirt or filings
- Microbial
- Incorrect fuels
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Tanks over 20 gallons usually have these?
Baffles
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Bladders are made of?
neoprene impregnated fabric
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What type of tanks are generally used in transport catagory aircraft?
Integral
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What are 2 benefits to integral tanks?
- Less weight
- Increased tank volume
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How much expansion space must a fuel tank have?
2% total capacity of tank
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Filler openings must be labeled with what 2 things on recip aircraft?
- Fuel type
- Minimum fuel rating
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If a fuel cap has a gooseneck vent , which direction do you install it?
Into the airflow
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T or F . replacing a fuel cap with a different type requires TC approval?
T
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Flapper valves or check valves in the fuel tank baffles are required in what type of aircraft?
aerobatic or aircraft capable of high G maneuvers
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Riveted integral tanks are sealed with?
Proseal or equivelent
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Light , high wing aircraft usually have what type of fuel system?
Gravity feed
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Rigid fuel lines that pass through wheel wells or engine compartments are usually made of?
stainless steel
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What must be observed when routing flexible fuel hoses?
Laylines
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Flexible fuel line is usually made of ?
teflon or synthetic rubber
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When installing stright run fuel lines, what must be done?
must have bends in the line to allow for some expansion and contraction
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If a fuel bladder is to sit empty for an extended time what should be done to it?
make sure there is no water and wipe inside of bladder with an oily rag
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If you are getting an inaccurate fuel reading on a bladder type fuel tank , what may have happened?
the bladder may have pulled away from its attachment points
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What must be labeled on turbine fuel fill ports?
- "Permissable fuel designations" - Jet fuel
- Max refueling fuel pressure
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Fuel system drains must be able to?
drain entire fuel system in the ground attitude
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A fuel system drain must discharge?
clear of all aircraft parts
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Fuel system drains must lock..?
positively in the closed position
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Fuel system drains must not be located in an area where...?
they will be sheared in a gear up landing
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Recip fuel systems sediment bowls are located?
in the lowest point of the fuel system
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Flexible fuel lines have what limitation?
Calendar life limit , 5 years
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Majority of rigid fuel lines are made of?
5056 Aluminum
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What color markers are aircraft fuel lines?
red and white with stars
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What are the 4 types of fuel valves?
- cone type
- poppet type
- soleniod type
- motor operated
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Fuel valves must be able to ?
shut off and re-supply fuel to each engine individually
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What are 4 classes of pumps other than main pump?
- emergency
- scavenge
- cross feed
- boost or aux
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What are 6 different design types of fuel pumps?
- wobble or dual acting
- centrifugal boost
- vane
- gear
- jet
- pulsating
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what are 3 types of fuel tanks?
- bladder
- integral
- welded sheet metal
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Small single engine aircraft with integral tanks usually have them located ?
in the "D" or forward section of the wings
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When routing fuel and electrical lines in the same area , how do you maintain safety?
route the fuel lines below any electrical
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What product is used to kill any microbes growing in the fuel tanks?
PRIST
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Always do this before attempting to fuel an aircraft?
ground the truck or tank to the aircraft
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What is used to test fuel volitility?
Reid vapor tester
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Which fuel has the highest freezing temperature?
Jet A
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What fuel has the lowest freezing temperature?
Avgas
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What are 2 different ways to heat fuel?
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What is turneplate made of?
Lead and tin lined steel
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What are 2 ways to control fuel heating?
- automaticly with a vernatherm
- manually by switch in cockpit
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How often are fuel filters checked?
before the first flight of the day
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Why is there a measurement on some screen disc type filters?
checking for crushing damage due to overtorque
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How much fuel must a gravity feed fuel system be able to deliver to the engine?
150% of maximum engine usage
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How much fuel must a pump driven fuel system be able to deliver to the engine?
125% of maximum engine usage
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