Airframe Mechanic Certification Aircraft Fuel Systems 2

Question 1

What material is commonly used for flexible fuel hose connections in certified aircraft fuel systems?

Accepted Answer

Teflon-lined synthetic rubber hose

Answer

Copper tubing

Answer

Aluminum rigid tubing

Answer

Unlined steel braided hose

Question 2

Where should a fuel tank sump drain be located to be most effective?

Accepted Answer

At the lowest point where water and sediment accumulate

Answer

At the highest point of the tank to allow air to escape

Answer

At the midpoint of the tank sidewall for access

Answer

Adjacent to the fuel quantity transmitter

Question 3

What is the purpose of a fuel cross-feed system on a multi-engine aircraft?

Accepted Answer

To allow fuel flow from one wing tank to the other or to feed any engine from any tank

Answer

To remove dissolved air from fuel lines

Answer

To return excess fuel to the main tank after engine shutdown

Answer

To boost fuel pressure during high-power takeoff

Question 4

Under what conditions may automotive gasoline (mogas) be used in a certificated aircraft?

Accepted Answer

Only when the aircraft has an STC specifically approving its use

Answer

Any time it has the same octane rating as the specified avgas

Answer

Always acceptable as an emergency substitute for avgas

Answer

It may be mixed freely with avgas without restriction

Question 5

What is the maximum allowable fuel tank leakage per FAA standards?

Accepted Answer

Seepage (wetness without drops forming) is acceptable; dripping is not

Answer

Zero leakage is permitted under any condition

Answer

Up to three drops per minute is acceptable during normal operation

Answer

Any minor leakage is acceptable if the fuel cap is secure

Question 6

What is the purpose of fuel tank baffles installed inside aircraft fuel tanks?

Accepted Answer

To prevent fuel surge and maintain fuel outlet coverage during flight maneuvers

Answer

To increase internal fuel tank pressure during climb

Answer

To filter large debris before fuel reaches the boost pump

Answer

To allow the fuel quantity transmitter to read accurately

Question 7

What type of fuel system is used on most high-wing general aviation aircraft with gravity-fed carburetor engines?

Accepted Answer

Gravity-feed system relying on fuel head pressure from the tanks

Answer

Pressure injection system with electric pumps

Answer

Bladder-cell system pressurized by engine bleed air

Answer

Centrifugal pump system driven by the accessory gearbox