CPL Acft Tech - Fuel & the Fuel System

The differences between Aviation Gasoline (AVGAS) and Motor Gasoline (MOGAS) are....

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• AVGAS is manufactured to a higher quality standard

• MOGAS has a higher lead content

• 100LL AVGAS is coloured blue

• AVGAS is more volatile than MOGAS

If a fuel has a dual performance number, for example 100/145, what do the two numbers indicate?

• The power obtained under ISA conditions, and the power obtained under ISA +15

• The power obtained with a weak mixture, and the power obtained with a rich mixture

• The minimum and maximum horse power engines that the fuel can be used in

• The minimum and maximum octane rating of the fuel

The flight manual of your aircraft will specify a grade of fuel that should be used in the engine. The use of a higher grade of fuel...

• increases the chances of plug fouling

• decreases the chances of plug fouling

• increases the risk of detonation

• may cause carburettor icing

If you use motor gasoline (MOGAS) in an aircraft engine you risk...

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• Vapour locks

• Lower power output

• Spark plug fouling

• Detonation

Aviation Turbine Fuel (AVTUR) has distinct properties. Some of these are...

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• straw or clear coloured

• smells like kerosene

• green coloured

• only available from tankers

If an aircraft is not going to be used for a number of days in a row, a precaution that can be taken to avoid water contamination in fuel is...

• keep aircraft fuel tanks full

• water will separate from the fuel if left, so tanks should be drained

• if the aircraft is hangared, remove the fuel caps to allow the tanks to breathe

If refuelling an aircraft from drums...

• a synthetic chamois should be used to strain the fuel and remove any dirt

• a siphon process should be used to avoid direct contact between drum and aircraft

• an inline filter should be used

• any static charge in the drum should be removed before refueling starts

An engine driven fuel pump...

• cannot be turned off by the pilot

• is turned on for landing, take off and other critical phases of flight only

• exists to pressurise the fuel line in the event of a blockage

• allows additional fuel to be provided in emergencies

Fuel strainers are located at what part of the fuel system?

• the lowest point

• the highest point

• the point where there is the highest pressure

• the point where there is the lowest pressure

Where an aircraft engine has a pump which supplies fuel to a header tank, and then fuel from that header tank flows into the engine/carburetor, that fuel system is known as...

• gravity-fed

• pump-fed

• pump-free

• normally aspirated