A&P Aircraft Fuel Systems 3

Question 1

When should fuel sump drains be checked by sampling fuel from the aircraft?

Accepted Answer

Before each flight, after refueling, and after the aircraft has sat overnight or longer

Answer

Only upon arrival after a long cross-country flight

Answer

Only during 100-hour and annual inspections

Answer

After every 10 hours of flight time

Question 2

What is the most common cause of water contamination in aircraft fuel tanks?

Accepted Answer

Water condensation forming when moist air in partially filled tanks cools

Answer

Metal particles from engine-driven fuel pump wear

Answer

Oxidation of fuel stabilizer additives

Answer

Algae and microbiological growth in kerosene fuel

Question 3

What is the correct action if water is found during a fuel sump drain check?

Accepted Answer

Continue draining until only clean fuel flows; ground the aircraft if water persists and have a mechanic inspect

Answer

Add an approved fuel additive to absorb the water and proceed with flight

Answer

Add additional fuel to dilute the water to an acceptable level

Answer

Fly the aircraft normally since water sinks and will not reach the engine

Question 4

What is the purpose of a fuel primer in an aircraft?

Accepted Answer

To deliver raw fuel directly to the engine intake system to enrich the mixture for cold engine starting

Answer

To clean fuel injector nozzles before engine start

Answer

To fill the carburetor float bowl with fuel before start

Answer

To pressurize the fuel tanks before engine start

Question 5

What is the function of a motive flow (jet) pump in an aircraft fuel system?

Accepted Answer

To transfer fuel from auxiliary or tip tanks to the main feed tank using engine fuel pressure and venturi effect

Answer

To provide primary high-pressure fuel flow to turbine engine fuel controls

Answer

To pressurize all fuel tanks above ambient atmospheric pressure

Answer

To filter motive flow fuel before it enters the engine-driven pump

Question 6

What indicates a clogged or restricted aircraft fuel filter?

Accepted Answer

Low fuel pressure downstream of the filter and a differential pressure warning indication

Answer

Increased fuel pressure on both sides of the filter

Answer

Higher fuel flow rate through the system

Answer

Higher fuel temperature readings at the engine fuel control

Question 7

Under FAR Part 43, the aircraft fuel system is inspected as part of which required inspection interval?

Accepted Answer

Every 100 hours as part of the 100-hour inspection

Answer

Every 25 hours of operation

Answer

Every 50 hours of operation

Answer

Every 200 hours or at annual inspection, whichever comes first