Aircraft Fuel Systems

Question 1

Fuel jettisoning is usually accomplished:
A. Through a common manifold and outlet in each wing.
B. By gravity flow into the outboard wing tanks and overboard through a common outlet in each wing.
C. Through individual outlets for each tank.

Answer 1

A. Through a common manifold and outlet in each wing.

Question 2

The primary purpose of an aircraft’s fuel jettison system is to quickly achieve a:
A. Lower landing weight.
B. Balanced fuel load.
C. Reduced fire hazard.

Answer 2

A. Lower landing weight.

Question 3

The fuel jettison valve must be designed to allow flight personnel:
A. To close the valve at any time and the fuel must discharge clear of the aircraft.
B. To discharge fuel clear of the aircraft.
C. To close the valve at anytime.

Answer 3

A. To close the valve at any time and the fuel must discharge clear of the aircraft.

Question 4

Which of the following is employed to maintain lateral stability when jettisoning fuel?
A. Two separate independent systems.
B. Crossfeed system.
C. Two interconnected systems.

Answer 4

A. Two separate independent systems.

Question 5

A fuel jettison is required under certain conditions if the maximum takeoff weight exceeds the maximum landing weight. What regulations cover the requirements of fuel jettisoning?
A. 14 CFR Parts 43 and 91.
B. 14 CFR Part 23 and 25 and CAM 4b.
C. 14 CFR Part 21 and 43 and CAM 8.

Answer 5

B. 14 CFR Part 23 and 25 and CAM 4b.

Question 6

Fuel is moved overboard in most fuel jettison systems by:
A. Boost pumps.
B. Gravity.
C. Gravity and engine-driven fuel pumps.

Answer 6

A. Boost pumps.

Question 7

Fuel jettisoning past the limits prescribed by federal Aviation Regulations is usually prevented by:
A. Closely monitoring the fuel quantity and turning off the fuel dump switch(es).
B. Dump limit valves or a low-level circuit.
C. Standpipes in the fuel tanks.

Answer 7

B. Dump limit valves or a low-level circuit.

Question 8

Which procedure must be followed when refueling aircraft with swept back wings?
A. Defuel all the tanks at one time.
B. Defuel the inboard wing tanks first.
C. Defuel the outboard wing tanks first.

Answer 8

C. Defuel the outboard wing tanks first.

Question 9

(Refer to figure 17) what is the purpose of the pump crossfeed valve?
A. Balance the fuel in the tanks.
B. Allow operation of engines from one tank.
C. Allow operation of the left engine when the right fuel-boost pump is inoperative.

Answer 9

B. Allow operation of engines from one tank.

Question 10

Normal fuel crossfeed system operation in multi engine aircraft:
A. Calls for jettisoning of fuel overboard to correct lateral instability.
B. Reduces contamination and/or fire hazards during fueling or refueling operations.
C. Provides a means to maintain a balanced fuel load condition.

Answer 10

C. Provides a means to maintain a balanced fuel load condition.

Question 11

How many vents, arranged so that they are not likely to become plugged at the same time, must be used in multi engine fuel system?
A. 2.
B. 4.
C. 6.

Answer 11

A. 2.

Question 12

What is the the primary purpose of the crossfeed system?
A. It allows any tank to supply fuel to any engine.
B. It bypasses the engine shutoff valve if it fails.
C. It divides the fuel and sends it to the injectors.

Answer 12

A. It allows any tank to supply fuel to any engine.

Question 13

Fuel system components must be bonded and grounded in order to:
A. Drain off static charges.
B. Prevent stray currents.
C. Retard galvanic corrosion.

Answer 13

A. Drain off static charges.

Question 14

How many engine driven fuel pumps per engine are required for engines requiring fuel pumps?
A. Two engines can share one fuel pump.
B. One fuel pumps for each engine.
C. Two fuel pumps for each engine.

Answer 14

B. One fuel pumps for each engine.

Question 15

A typical large transport aircraft fuel manifold system allows how many of the following?
1) All tanks can be serviced through a single connection.
2) Any engine can be fed from any tank.
3) All engines can be fed from all tanks simultaneously.
4) A damaged rank can be isolated from the rest of the fuel system.
A. 1 and 2.
B. 1,2, and 3.
C. 1,2,3, and 4.

Answer 15

C. 1,2,3, and 4.

Question 16

A fuel system must be designed to prevent fuel vapor ignition caused by:
A. Over-heating.
B. Back-fire.
C. Lightning.

Answer 16

C. Lightning.

Question 17

What is the minimum distance allowed between a fuel tank and the fire wall separating the engine?
A. One-half inch.
B. One inch.
C. Two inch.

Answer 17

A. One-half inch.

Question 18

Fuel baffles are installed in tanks to prevent _______ caused by changes in the attitude of the aircraft.
A. Vapors.
B. Surging.
C. Starvation.

Answer 18

B. Surging.

Question 19

Many fuel tanks incorporate________ valves to prevent fuel from flowing away from the boost pump or tank outlet when the aircraft is in a high-G maneuver.
A. Flapper.
B. Check.
C. Dump.

Answer 19

A. Flapper.

Question 20

Fuel heaters are used with fuel systems for turbine engines to prevent ______ in the fuel from clogging system filters.
A. Moisture.
B. Ice crystals.
C. Contamination.

Answer 20

B. Ice crystals.

Question 21

A transducer in a fuel pressure system serves what function?
A. Transmits an electrical signal to the transmitter for fluid pressure.
B. Transmits electrical signal proportional to the fluid pressure.
C. Converts fluid pressure directly through a transmitter to the indicator.

Answer 21

C. Converts fluid pressure directly through a transmitter to the indicator.

Question 22

The use of turbine fuels in aircraft has resulted in some problems not normally associated with aviation gasolines. One of these problems is:
A. Increasing viscosity of fuel as fuel temperature lowers at altitude.
B. Higher vapor pressure.
C. Microbial contaminants.

Answer 22

C. Microbial contaminants.

Question 23

What is used in many aircraft to prevent bubbles in the fuel after it leaves the tank when atmospheric pressure is lower than fuel vapor pressure?
A. Air-fuel separators.
B. Anti-foaming additives.
C. Boost pumps.

Answer 23

C. Boost pumps.

Question 24

Which of the following precautions is most important during refueling operations?
A. All outside electrical sources must be disconnected from the aircraft.
B. Fuel to be used must be appropriately identified.
C. All electrical switches must be in OFF position.

Answer 24

B. Fuel to be used must be appropriately identified.

Question 25

Before fueling an aircraft by using the pressure fueling method, what important precaution should be observed?
A. The truck pump pressure must be correct for that refueling system.
B. The truck pump pressure must be adjusted for minimum filter pressure.
C. The aircraft’s electrical system must be on to indicate quantity gauge readings.

Answer 25

A. The truck pump pressure must be correct for that refueling system.

Question 26

What flight safety-related advantage does a pressure fueling system provide?
A. Keeps the aircraft within weight and balance limitations.
B. Reduces the chances for fuel contamination.
C. Reduces the time required for fueling.

Answer 26

B. Reduces the chances for fuel contamination.

Question 27

Aircraft pressure fueling systems instructional procedures are normally placated on the:
A. Fuel control panel access door.
B. Lower wing surface adjacent to the access door.
C. Aircraft ground connection point.

Answer 27

A. Fuel control panel access door.

Question 28

Pressure fueling of aircraft is usually accomplished through;
A. Pressure connections on individual fuel tanks.
B. At least one single point connection.
C. Individual fuel tank over wing and/or fuselage access points.

Answer 28

B. At least one single point connection.

Question 29

Which of the following may be used for the repair of fuel leaks on most integral fuel tanks?
A. Welding and