Section I: A2.U8 Quiz Aircraft Systems

Which fuel system component vaporizes fuel and pushes it directly into the cylinders? (A2.U8.SA.L1)

• Filler
• Primer
• Pump
• Vent

An aircraft engine specifies that it requires 100LL fuel. What color avgas should be used in this engine? (A2.U8.SA.L1)

• Blue
• Green
• Red
• Yellow

Which of these could occur if a fuel tank is allowed to run dry? Select all that apply. (A2.U8.SA.L1)

• Engine may stop or be difficult to restart
• Water could enter the tank
• The fuel lines will freeze
• Vapor lock may occur in the fuel lines
• Requires in-air refueling

True or False. The aircraft must be connected to the fuel pump with a ground wire before fueling. (A2.U8.SA.L1)

• True
• False

Why are aircraft fuel tanks vented to the outside? (A2.U8.SA.L1)

• To let volatile gases escape
• To allow excess fuel to drain out of the tank
• To prevent the fuel from freezing in cold weather
• To maintain atmospheric pressure inside the tank

Why does a pilot drain a small amount of fuel from each sump before each flight? Select all that apply. (A2.U8.SA.L1)

• To check the grade of fuel in the tank
• To reduce the pressure in the tank
• To ensure the tank is not overfilled
• To drain the tank of fuel vapors
• To clean contaminants from the tank

An aircraft designed to fly upside down would most likely have which type of fuel system? (A2.U8.SA.L1)

• Gravity feed fuel system, because the fuel would be stored above the wings even when the aircraft is upside down
• Gravity feed fuel system, because the fuel would be pumped into the engine even when the aircraft is upside down
• Inverted fuel system, because the fuel would be pressurized even when the aircraft is upside down
• Inverted fuel system, because the flop tube would draw from the lowest point in the fuel tank even when the aircraft is upside down

The fuel gauge on an aircraft shows that the left tank has 26 pounds and the right tank has 20 pounds of fuel. How should the pilot set the fuel selector to keep the fuel load balanced? (A2.U8.SA.L1)

• Left
• Right
• Between Left and Right
• Both

What is the difference between jet fuel and avgas? (A2.U8.SA.L1)

• Avgas is colorless, while jet fuel isn’t.
• Jet fuel has a higher flashpoint than avgas.
• Jet fuel is kerosene-based and avgas is gasoline-based.
• Jet fuel is red-colored, while avgas is blue-colored.

How can water enter the fuel supply? Select all that apply. (A2.U8.SA.L1)

• Low humidity
• Faulty filler caps
• Overheating
• Higher altitudes
• Condensation in partially filled fuel tanks